361
20
16481
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Dublin Core
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Articles
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Strain-Induced Tribocatalytic Activity of 2D ZnO Quantum Dots
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The use of low-frequency vibration or high-frequency ultrasound waves to create polarization and an inherent electric field in piezo-tribocatalysts has recently been shown to be a novel advanced oxidation process. In this study, we have demonstrated the synthesis of two-dimensional (2D) ZnO quantum dots (QDs) and their strain-induced tribocatalytic effect, where the triboelectric charges generated under the influence of friction and strain are used to facilitate the decomposition of organic dye molecules. The catalytic performance of 2D QD catalysts can be tuned by modulation of the strain-induced band-gap variation, which are typically regarded as the active sites. The underlying mechanism for the strain-induced catalytic performance is due to the presence of defective dipole moments. Detailed theoretical investigations reveal strain-induced charge-transfer-dependent catalytic properties of the 2D ZnO QD-polymer interface. We believe that the present work provides a fundamental understanding of the design of high-performance catalysis applications for water cleaning and emerging technologies. 2024 American Chemical Society.
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Kumbhakar P.; Mishra S.; Kumbhakar P.; Barik R.K.; Tiwary C.S.; Singh A.K.
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Journal of Physical Chemistry C, Vol-128, No. 25, pp. 10733-10741.
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American Chemical Society
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2024-01-01
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<a href="https://doi.org/10.1021/acs.jpcc.4c02798" target="_blank" rel="noreferrer noopener">https://doi.org/10.1021/acs.jpcc.4c02798</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85196007564&doi=10.1021%2Facs.jpcc.4c02798&partnerID=40&md5=c7f9fdbba4bc095382fbed7a51334400" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85196007564&doi=10.1021%2facs.jpcc.4c02798&partnerID=40&md5=c7f9fdbba4bc095382fbed7a51334400</a>
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ISSN: 19327447
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Online
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English
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Article
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Kumbhakar P., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Mishra S., Materials Research Centre, Indian Institute of Science, Bangalore, 560012, India; Kumbhakar P., Nanoscience Laboratory, Department of Physics, National Institute of Technology, West Bengal, Durgapur, 713209, India; Barik R.K., Materials Research Centre, Indian Institute of Science, Bangalore, 560012, India; Tiwary C.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology, West Bengal, Kharagpur, 721302, India; Singh A.K., Materials Research Centre, Indian Institute of Science, Bangalore, 560012, India
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Title
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Articles
Article
Faculty Publications -Articles
Dublin Core
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Title
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2D Materials Coated Flexible Origami for Low-Frequency Energy Harvesting
Subject
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2D materials; DFT; origami structures; paper; wave energy
Description
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Wave energy is one of the most abundant energy sources. Triboelectric nanogenerators (TENGs) are becoming more popular for sustainable energy generation from waves. Concerning the renewable energy demands, we focus on developing cost-effective and adaptable origami-TENGs (O-TENGs) for harvesting wave energy, specifically utilizing paper-based (cellulose) materials. An origami-inspired lightweight and scalable design is proposed to create high-performance O-TENGs suitable for the complex conditions of low-frequency wave excitation. The paper-based spring-like O-TENG is coated with two-dimensional (2D) molybdenum disulfide (MoS2) nanosheets and demonstrates efficacy in harvesting mechanical energy in the ambient environment and the output performance compared with reduced graphene oxides (rGO). A detailed density functional theory (DFT) calculation was used to analyze the charge transfer mechanism in the coated origami structures. Furthermore, a barrel-shaped floating generator incorporating multiple origami TENGs is introduced to capture ocean wave energy across various frequencies, amplitudes, and directional movements. Since the coated origami structures show a good self-rebounding spring-like nature and energy harvesting properties, they are suitable for blue energy harvesting. 2025 American Chemical Society.
Creator
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Kumbhakar P.; Mishra S.; Nayak P.V.; Sunny A.; Singh A.K.
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ACS Applied Electronic Materials
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American Chemical Society
Date
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2025-01-01
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<a href="https://doi.org/10.1021/acsaelm.4c01958" target="_blank" rel="noreferrer noopener">https://doi.org/10.1021/acsaelm.4c01958</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85216491511&doi=10.1021%2Facsaelm.4c01958&partnerID=40&md5=c18370c4a35e7113f329e689981a049c" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85216491511&doi=10.1021%2facsaelm.4c01958&partnerID=40&md5=c18370c4a35e7113f329e689981a049c</a>
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Restricted Access
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ISSN: 26376113
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Online
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English
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Article
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Kumbhakar P., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Mishra S., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Nayak P.V., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Sunny A., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Singh A.K., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India
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Dublin Core
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Title
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Articles
Article
Faculty Publications -Articles
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Plasmonic Nanocomposite for Visible Light-Modulated Bimorph-Actuator
Subject
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bimorph actuators; interface; photoswitch; photothermal response; plasmonics
Description
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Soft actuators have great potential applications in sophisticated movement and sensitive devices due to their flexible nature, good interaction, and precise control. However, existing carbon-based optical actuators are limited in their response under visible light irradiation. The limited visible light absorbance of the carbon nanostructure brought the metallic nanoparticle into the soft actuators that can absorb visible light. This study introduces a new type of plasmonic photothermal-bimorph actuator, using graphene oxide (GO), reduced graphene oxide (rGO), and silver nanorods (Ag NRs) to overcome the limitations of traditional optical actuators. The bimorph film is actuated by visible and near-infrared light stimuli with various power densities showing reversible deformation behavior. The actuator shows significant bending associated with a ?50 change in bending angle under visible light irradiation with a response time of ?5 1 sec. Furthermore, a smart photo-controlled non-contact switch is fabricated based on photo-thermal conversion properties, demonstrating perfect integration of plasmonic bimorph actuators. The density functional theory based molecular dynamics calculations provide an additional understanding of the bending of actuators under external stimulus. Using illustrative demonstrations of actuators, these results hint at a method for generating multipurpose visible light-based soft robots, supporting a new approach to developing an optical locking system. 2024 Wiley-VCH GmbH.
Creator
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Kumbhakar P.; Narendhiran S.; Midya S.; Islam M.; Balachandran M.; Singh A.K.
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Advanced Materials Technologies, Vol-10, No. 3
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John Wiley and Sons Inc
Date
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2025-01-01
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<a href="https://doi.org/10.1002/admt.202401037" target="_blank" rel="noreferrer noopener">https://doi.org/10.1002/admt.202401037</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208035345&doi=10.1002%2Fadmt.202401037&partnerID=40&md5=70a4271267464f4bf225ef19290be0a0" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208035345&doi=10.1002%2fadmt.202401037&partnerID=40&md5=70a4271267464f4bf225ef19290be0a0</a>
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Restricted Access
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ISSN: 2365709X
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Online
Language
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English
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Article
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Kumbhakar P., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Narendhiran S., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Midya S., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Islam M., IMDEA Materials Institute, Tecnogetafe, Calle Eric Kandel 2, Madrid, Getafe, 28906, Spain; Balachandran M., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Singh A.K., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India
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Dublin Core
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Title
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Articles
Article
Faculty Publications -Articles
Dublin Core
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Title
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Spontaneous hydrogen production using gadolinium telluride
Subject
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Inorganic materials; Materials chemistry; Materials science
Description
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Developing materials for controlled hydrogen production through water splitting is one of the most promising ways to meet current energy demand. Here, we demonstrate spontaneous and green production of hydrogen at high evolution rate using gadolinium telluride (GdTe) under ambient conditions. The spent materials can be reused after melting, which regain the original activity of the pristine sample. The phase formation and reusability are supported by the thermodynamics calculations. The theoretical calculation reveals ultralow activation energy for hydrogen production using GdTe caused by charge transfer from Te to Gd. Production of highly pure and instantaneous hydrogen by GdTe could accelerate green and sustainable energy conversion technologies. 2023
Creator
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Kumbhakar P.; Parui A.; Dhakar S.; Paliwal M.; Behera R.; Gautam A.R.S.; Roy S.; Ajayan P.M.; Sharma S.; Singh A.K.; Tiwary C.S.
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iScience, Vol-26, No. 4
Publisher
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Elsevier Inc.
Date
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2023-01-01
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<a href="https://doi.org/10.1016/j.isci.2023.106510" target="_blank" rel="noreferrer noopener">https://doi.org/10.1016/j.isci.2023.106510</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85152270299&doi=10.1016%2Fj.isci.2023.106510&partnerID=40&md5=dc0a9be5b26c1ee8d1ae74b7414adf75" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85152270299&doi=10.1016%2fj.isci.2023.106510&partnerID=40&md5=dc0a9be5b26c1ee8d1ae74b7414adf75</a>
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All Open Access; Gold Open Access; Green Open Access
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ISSN: 25890042
Format
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Online
Language
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English
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Article
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Kumbhakar P., Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India, Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Parui A., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Dhakar S., Department of Chemistry, Indian Institute of Technology Gandhinagar, Gandhinagar, 382355, India; Paliwal M., Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India; Behera R., Materials Engineering, Indian Institute of Technology, Gandhinagar, 382355, India; Gautam A.R.S., Materials Engineering, Indian Institute of Technology, Gandhinagar, 382355, India; Roy S., Department of Materials Science and NanoEngineering, Rice University, Houston, 77005, TX, United States; Ajayan P.M., Department of Materials Science and NanoEngineering, Rice University, Houston, 77005, TX, United States; Sharma S., Department of Chemistry, Indian Institute of Technology Gandhinagar, Gandhinagar, 382355, India; Singh A.K., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Tiwary C.S., Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
-
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Articles
Article
Faculty Publications -Articles
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Enhanced Light Scattering Using a Two-Dimensional Quasicrystal-Decorated 3D-Printed Nature-Inspired Bio-photonic Architecture
Description
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A number of strategies have been exploited so far to trap photons inside living cells to obtain high-contrast imaging. Also, launching light inside biological materials is technically challenging. Using photon confinement in a three-dimensional (3D)-printed biomimetic architecture in the presence of a localized surface plasmon resonance (LSPR) promoter can overcome some of these issues. This work compares optical confinement in natural and 3D-printed photonic architectures, namely, fish scale, in the presence of atomically thin Al70Co10Fe5Ni10Cu5 quasicrystals (QCs). Due to their wideband LSPR response, the QCs work as photon scattering hotspots. The architecture acts as an additive source of excitation for the two-dimensional (2D) QCs via total internal reflection (TIR). The computational analysis describes the surface plasmon-based scattering property of 2D QCs. The 3D-printed fish scale's image contrast with the 2D Al70Co10Fe5Ni10Cu5 QC has been compared with other 2D materials (graphene, h-BN, and MoS2) and outperforms them. The present study conceptually presents a new approach for obtaining high-quality imaging of biological imaging, even using high-energy photons. 2023 American Chemical Society.
Creator
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Kumbhakar P.; Pramanik A.; Mishra S.S.; Tromer R.; Biswas K.; Dasgupta A.; Galvao D.S.; Tiwary C.S.
Source
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Journal of Physical Chemistry C, Vol-127, No. 20, pp. 9779-9786.
Publisher
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American Chemical Society
Date
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2023-01-01
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<a href="https://doi.org/10.1021/acs.jpcc.3c00513" target="_blank" rel="noreferrer noopener">https://doi.org/10.1021/acs.jpcc.3c00513</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85160735552&doi=10.1021%2Facs.jpcc.3c00513&partnerID=40&md5=5733e0f1514538bf53a250f1496e0fac" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85160735552&doi=10.1021%2facs.jpcc.3c00513&partnerID=40&md5=5733e0f1514538bf53a250f1496e0fac</a>
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Restricted Access
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ISSN: 19327447
Format
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Online
Language
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English
Type
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Article
Coverage
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Kumbhakar P., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India, Department of Physics and Electronics, CHRIST (Deemed to Be University), Bangalore, 560029, India; Pramanik A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India; Mishra S.S., Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India; Tromer R., Applied Physics Department, University of Campinas, Campinas, 13083-872, Brazil; Biswas K., Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India; Dasgupta A., Physical Metallurgy Division, Materials Metallurgy Group, Indira Gandhi Center for Atomic Research, HBNI, Kalpakkam, 603102, India; Galvao D.S., Applied Physics Department, University of Campinas, Campinas, 13083-872, Brazil; Tiwary C.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India
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Dublin Core
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Title
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Faculty Publications
Article
Faculty Publications -Articles
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Kumbhakar, Partha; Mishra, Subhendu; Gowda, Chinmayee Chowde; Nishma, P.M.; Venugopal, Aparna; Singh, Abhishek Kumar; Tiwary, Chandra Sekhar
Title
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2D MnTe/rGO Hybrid Structure for Moisture Energy Harvesting
Date
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01-01-2025
Source
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ACS Applied Materials and Interfaces;Volume;17;Issue;22;pp.32973-32983
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<a href="https://doi.org/10.1021/acsami.5c00230" target="_blank" rel="noreferrer noopener">https://doi.org/10.1021/acsami.5c00230</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105005770075?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105005770075?origin=resultslist</a>
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Kumbhakar P., Department of Physics and Electronics, Christ University, Karnataka, Bangalore, 560029, India; Mishra S., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Gowda C.C., School of Nano Science and Technology, Indian Institute of Technology Kharagpur, West Bengal, Kharagpur, 721302, India; Nishma P.M., Department of Physics and Electronics, Christ University, Karnataka, Bangalore, 560029, India; Venugopal A., Department of Physics and Electronics, Christ University, Karnataka, Bangalore, 560029, India; Singh A.K., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Tiwary C.S., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, West Bengal, Kharagpur, 721302, India
Description
An account of the resource
The development and widespread use of wind, solar, geothermal, and other renewable energy sources have increased the supply of clean, green electricity while reducing environmental strain. Extracting renewable energy from continuously available humid air is a potential pathway for a sustainable future. Here, we explore the use of two-dimensional (2D) manganese telluride (MnTe) hybrid structures with reduced graphene oxide (rGO), for absorbing moisture and atmospheric humidity. The resistance of the 2D hybrid structures increases with moisture exposure and decreases upon moisture removal, suggesting their suitability for humidity-controlled power devices. The optimized thickness of the composites exhibits the highest response under moisture exposure due to the interfacial charge transfer. The MnTe/rGO hybrid structure also absorbs a low amount of moisture from ambient humid (RH ? 90%) air, resulting in electrical output up to ?125 mV within ?15 s. Furthermore, the study hints at the potential of 2D MnTe for energy harvesting from moisture and sustainable power sources. We used density functional theory (DFT) calculations to understand the systems ability to transfer charge. In situ Raman spectroscopy and imaging techniques further confirm the effect of moisture on a hybrid surface. These findings lay the foundation for developing an efficient nanogenerator that can find applications in wearable electronics and environmental monitoring systems. The study contributes to materials science and offers a pathway towards developing sustainable and efficient electronic devices and environmental monitoring systems. 2025 American Chemical Society.
Subject
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DFT; hybrid structure; interface; moisture based energy harvesting; two-dimensional (2D) materials
Publisher
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American Chemical Society
Relation
A related resource
ISSN: 19448244;
Language
A language of the resource
English
Type
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Article
Rights
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Restricted Access; Hardcopy may be available in the library
Format
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online
-
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Title
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Faculty Publications
Article
Faculty Publications -Articles
Dublin Core
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Creator
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Kumbhakar, Partha; Mishra, Subhendu; Nayak, Prapti V.; Sunny, Angela; Singh, Abhishek Kumar
Title
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2D Materials Coated Flexible Origami for Low-Frequency Energy Harvesting
Date
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01-01-2025
Source
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ACS Applied Electronic Materials;Volume;7;Issue;3;pp.1111-1119
Identifier
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<a href="https://doi.org/10.1021/acsaelm.4c01958" target="_blank" rel="noreferrer noopener">https://doi.org/10.1021/acsaelm.4c01958</a> <br /><br /><a href="https://www.scopus.com/pages/publications/85216491511?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/85216491511?origin=resultslist</a>
Coverage
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Kumbhakar P., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Mishra S., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Nayak P.V., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Sunny A., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Singh A.K., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India
Description
An account of the resource
Wave energy is one of the most abundant energy sources. Triboelectric nanogenerators (TENGs) are becoming more popular for sustainable energy generation from waves. Concerning the renewable energy demands, we focus on developing cost-effective and adaptable origami-TENGs (O-TENGs) for harvesting wave energy, specifically utilizing paper-based (cellulose) materials. An origami-inspired lightweight and scalable design is proposed to create high-performance O-TENGs suitable for the complex conditions of low-frequency wave excitation. The paper-based spring-like O-TENG is coated with two-dimensional (2D) molybdenum disulfide (MoS2) nanosheets and demonstrates efficacy in harvesting mechanical energy in the ambient environment and the output performance compared with reduced graphene oxides (rGO). A detailed density functional theory (DFT) calculation was used to analyze the charge transfer mechanism in the coated origami structures. Furthermore, a barrel-shaped floating generator incorporating multiple origami TENGs is introduced to capture ocean wave energy across various frequencies, amplitudes, and directional movements. Since the coated origami structures show a good self-rebounding spring-like nature and energy harvesting properties, they are suitable for blue energy harvesting. 2025 American Chemical Society.
Subject
The topic of the resource
2D materials; DFT; origami structures; paper; wave energy
Publisher
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American Chemical Society
Relation
A related resource
ISSN: 26376113;
Language
A language of the resource
English
Type
The nature or genre of the resource
Article
Rights
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Restricted Access; Hardcopy may be available in the library
Format
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online
-
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Faculty Publications
Article
Faculty Publications -Articles
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Creator
An entity primarily responsible for making the resource
Kumbhakar, Partha; Narendhiran, Santhosh; Midya, Soumen; Islam, Monsur; Balachandran, Manoj; Singh, Abhishek Kumar
Title
A name given to the resource
Plasmonic Nanocomposite for Visible Light-Modulated Bimorph-Actuator
Date
A point or period of time associated with an event in the lifecycle of the resource
01-01-2025
Source
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Advanced Materials Technologies;Volume;10;Issue;3;Article No.;2401037;
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<a href="https://doi.org/10.1002/admt.202401037" target="_blank" rel="noreferrer noopener">https://doi.org/10.1002/admt.202401037</a> <br /><br /><a href="https://www.scopus.com/pages/publications/85208035345?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/85208035345?origin=resultslist</a>
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Kumbhakar P., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Narendhiran S., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Midya S., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India; Islam M., IMDEA Materials Institute, Tecnogetafe, Calle Eric Kandel 2, Madrid, Getafe, 28906, Spain; Balachandran M., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560029, India; Singh A.K., Materials Research Centre, Indian Institute of Science, Karnataka, Bangalore, 560012, India
Description
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Soft actuators have great potential applications in sophisticated movement and sensitive devices due to their flexible nature, good interaction, and precise control. However, existing carbon-based optical actuators are limited in their response under visible light irradiation. The limited visible light absorbance of the carbon nanostructure brought the metallic nanoparticle into the soft actuators that can absorb visible light. This study introduces a new type of plasmonic photothermal-bimorph actuator, using graphene oxide (GO), reduced graphene oxide (rGO), and silver nanorods (Ag NRs) to overcome the limitations of traditional optical actuators. The bimorph film is actuated by visible and near-infrared light stimuli with various power densities showing reversible deformation behavior. The actuator shows significant bending associated with a ?50 change in bending angle under visible light irradiation with a response time of ?5 1 sec. Furthermore, a smart photo-controlled non-contact switch is fabricated based on photo-thermal conversion properties, demonstrating perfect integration of plasmonic bimorph actuators. The density functional theory based molecular dynamics calculations provide an additional understanding of the bending of actuators under external stimulus. Using illustrative demonstrations of actuators, these results hint at a method for generating multipurpose visible light-based soft robots, supporting a new approach to developing an optical locking system. 2024 Wiley-VCH GmbH.
Subject
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bimorph actuators; interface; photoswitch; photothermal response; plasmonics
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John Wiley and Sons Inc
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ISSN: 2365709X;
Language
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English
Type
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Article
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All Open Access; Bronze Open Access
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online
-
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PHD
PhD
PhD Thesis
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61000183
Title
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Effects of central bank intervention through quasi fiscal policies evidence from reserve bank of zimbabwe
Subject
The topic of the resource
Management Studies
Description
An account of the resource
This was a research exercise which was conducted to establish the impact of newlineZimbabwe s Central Bank s interventions on the economy. As Zimbabwe s economic newlinecondition went through a nose-dive, the government found itself unable to respond to newlinethe numerous needs with no resources. The country was achieving negative gross domestic product (GDP) growth rate every year since the turn of the new millennium. The country could not borrow from the Bretton Woods institutions such as the International Monetary Fund (IMF) because of the illegal sanctions imposed by the United States and European Union following the country s land reform program which acquired farms from the majority of the 4,000 white farmers who owned about 80 percent of the country s arable area. The Zimbabwe Economic and Democracy newlineRecovery Act of 2001 (ZEDERA), enacted in the USA prevented American companies from doing business in Zimbabwe. The Reserve Bank of Zimbabwe stepped in to assist. The research was aimed at establishing the effect the central bank intervention on the economy. Was the effect of the intervention good, or bad? Did the central bank s intervention really make things worse or did it ameliorate the effects of the downturn in the economy? For newlineinstance, did it contribute to the increase in inflation? What would have been the newlinesituation had the Bank not intervened? This study sought to answer the basic question: newline What was the overall impact of the RBZ s quasi-fiscal activities on the Zimbabwean newlineeconomy? Hypotheses were formulated on the basis of the above objectives and were tested newlinevia a variety of statistical techniques. The research instruments for data collection newlinewere a questionnaire and interviews guides. The questionnaire was the main research newlineinstrument followed by interviews. The questionnaire had a fusion of open ended and newlineclosed questions. The research showed that the RBZ s quasi-fiscal operations helped newlinethe country most in containing emergency situations and improved access to financial newlineresources by the productive sectors.
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Kunaka, Matthews Tichaona.
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Author's Submission
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Christ(Deemed to be University)
Date
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2020-01-01
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Mathew, Jain and Rusvingo, Lusvingo Silas
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Open Access
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PDF
Language
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English
Type
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PhD
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<a href="http://hdl.handle.net/10603/423330" target="_blank" rel="noreferrer noopener">http://hdl.handle.net/10603/423330</a>
-
https://archives.christuniversity.in/files/original/9a47a041469c35f6ef14af4da08a4f4d.pdf
c680bab5b127d705da722f6ce86b9455
Dublin Core
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Thesis
PhD
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Title
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Effects of central bank intervention through quasi fiscal policies evidence from reserve bank of zimbabwe /
Subject
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Management
Creator
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Kunaka, Matthews Tichaona. - 1140006
Publisher
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CHRIST (Deemed to be University)
Date
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2020-12-22
Language
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English
Type
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PhD
-
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Title
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Faculty Publications
Article
Faculty Publications -Articles
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Kunal; Rai, Keerti; Pradhan, Sanghamitra; Sellamuthu, Prabhukumar; Thangavelu, Indumathi; Tadepalli, Srinivas; Bhran, Ahmed A.
Title
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Development of pluronic F127 and folic acid coated TiO2nanoparticles for antimicrobial and anticancer applications
Date
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01-01-2026
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Naunyn-Schmiedeberg's Archives of Pharmacology;Volume;399;Issue;3;pp.3533-3544
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<a href="https://doi.org/10.1007/s00210-025-04663-1" target="_blank" rel="noreferrer noopener">https://doi.org/10.1007/s00210-025-04663-1</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105017583674?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105017583674?origin=resultslist</a>
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Kunal, Department of Life Sciences, Faculty of Allied Health Sciences, SGT University, Haryana, Gurugram, India; Rai K., Department of Electrical & Electronics, ARKA JAIN University, Jharkhand, Jamshedpur, India; Pradhan S., Department of Chemistry, Siksha ?O Anusandhan (Deemed to Be University), Odisha, Bhubaneswar, 751030, India; Sellamuthu P., Department of Mechanical Engineering, Presidency University, Karnataka, Bengaluru, India; Thangavelu I., Department of Chemistry, CHRIST (Deemed to Be University), Karnataka, Bangalore, 560029, India; Tadepalli S., Department of Chemical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11432, Saudi Arabia; Bhran A.A., Department of Chemical Engineering, College of Engineering, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 11432, Saudi Arabia
Description
An account of the resource
Functionalizing metal oxide nanoparticles with polymers and folic acid enhances eco-friendly synthesis, therapeutic efficiency, and cost-effectiveness. This study reports the green synthesis of titanium dioxide (TiO?) and folic acidPluronic F127modified TiO?(TiPFFA) nanoparticles usingPsidium guajavaleaf extract as a natural reducing and stabilizing agent. X-ray diffraction (XRD) analysis confirmed that both nanoparticles crystallized in the rutile phase. Morphological characterization by FESEM and TEM showed that the nanoparticles were spherical with uniform size distribution. FTIR spectroscopy showed TiOTi (789cm?1) and TiO (666cm?1) for TiO?; TiPFFA had extra peaks at 951 and 640cm?1, confirming the lattice. PL spectra exhibited emission peaks at 518nm (TiO?) and 520nm (TiPFFA), indicating oxygen vacancies linked to reactive oxygen species generation. Antimicrobial tests against methicillin-resistantStaphylococcus aureus andCandida albicansshowed superior activity of TiPFFAnanoparticles compared to TiO?. Cytotoxicity assays on MDA-MB-231 breast cancer cells and L929 fibroblast cells demonstrated enhanced anticancer activity and better biocompatibility for TiPFFA. These findings highlight TiPFFA nanoparticles as promising candidates for targeted cancer therapy and as antimicrobial agents. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.
Subject
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Cytotoxicity; Folic acid; Methicillin-resistant; Pluronic F127; Titanium dioxide
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Springer Science and Business Media Deutschland GmbH
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ISSN: 281298; CODEN: NSAPC
Language
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English
Type
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Article
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Restricted Access; Hardcopy may be available in the library
Format
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online
-
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Title
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Articles
Article
Faculty Publications -Articles
Dublin Core
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Title
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A CRITICAL STUDY IN UNDERSTANDING THE POTENTIAL BENEFITS OF IMPLEMENTING DIGITAL FINANCIAL APPLICATION IN ENHANCING THE ACCOUNTING PERFORMANCE IN ORGANISATIONS
Subject
The topic of the resource
Accounting Performance; ANOVA; Digital financial Application; Financial Regulations
Description
An account of the resource
Failure to innovate in this era of rapid IT growth is a significant obstacle to the modernization and growth of industries and increases the competitiveness of such organizations in the market. Strong innovation and competence are more than necessary to turn innovative ideas into reality, gain new competitive advantages and achieve sustainable long-term growth. Innovation is not only an important tool for companies to increase their competitiveness, it is also an important driver of long-term economic growth for a country. Regular engagement in high-quality innovation activities should be mandatory for organizations that intend to successfully adapt to today's fast-paced digital economy. If companies want to improve their chances of survival in the coming years and continue to grow, they need to invest in their innovation capabilities. Many companies now operate under the assumption that updating their accounting systems with advanced software will provide better results than relying on old, time-honored methods. Concrete steps are needed, such as developing powerful data-driven tools to improve how individuals, organizations and governments spend their money. Beginners still have to put in the effort to learn new skills because they often have trouble imagining using a device they've never used before to accomplish a task. Due to the increased automation of this financial system, the risk of error has increased; So it is very important. In fact, you can manage your needs exactly with this tool. 2024 Published by Faculty of Engineering.
Creator
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Kuncha R.K.; Sharma D.
Source
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Proceedings on Engineering Sciences, Vol-6, No. 2, pp. 837-844.
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Faculty of Engineering, University of Kragujevac
Date
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2024-01-01
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<a href="https://doi.org/10.24874/PES06.02A.010" target="_blank" rel="noreferrer noopener">https://doi.org/10.24874/PES06.02A.010</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85197618482&doi=10.24874%2FPES06.02A.010&partnerID=40&md5=d4e770c75acc426d83ee63781b854d40" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85197618482&doi=10.24874%2fPES06.02A.010&partnerID=40&md5=d4e770c75acc426d83ee63781b854d40</a>
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All Open Access; Gold Open Access
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ISSN: 26202832
Format
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Online
Language
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English
Type
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Article
Coverage
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Kuncha R.K., School of Business & Management, CHRIST (Deemed to be University), Bangalore, 560029, India; Sharma D., School of Business & Management, CHRIST (Deemed to be University), Bangalore, 560029, India
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Title
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Book Chapter
Book Chapter
Faculty Publications- Book Chapter
Dublin Core
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Title
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The aesthetics of corpses in popular culture
Description
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[No abstract available]
Creator
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Kundu D.
Source
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Death in Contemporary Popular Culture, pp. 103-115.
Publisher
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Taylor and Francis Inc.
Date
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2019-01-01
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<a href="https://doi.org/10.4324/9780429197024-7" target="_blank" rel="noreferrer noopener">https://doi.org/10.4324/9780429197024-7</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85104170153&doi=10.4324%2F9780429197024-7&partnerID=40&md5=5f7c22bdb07b6cd1e1f9776d6620f889" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85104170153&doi=10.4324%2f9780429197024-7&partnerID=40&md5=5f7c22bdb07b6cd1e1f9776d6620f889</a>
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Restricted Access
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ISBN: 978-042919702-4; 978-036718585-5
Format
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Online
Language
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English
Type
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Book chapter
Coverage
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Kundu D., School of Business Studies and Social Sciences, Christ (Deemed to Be University), Bangalore, India
-
Dublin Core
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Title
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Faculty Publications
Book Chapter
Faculty Publications- Book Chapter
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Kundu, Anirban; Datta, Pratip Kumar; Chakrabarti, Saumya
Title
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The Informal Sector in India: Neo-dualism and Dual Policy Response
Date
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01-01-2025
Source
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Contradictions of Democracy, Development and Inequality: A Case of India;pp.119-134
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<a href="https://doi.org/10.4324/9781003527978-10" target="_blank" rel="noreferrer noopener">https://doi.org/10.4324/9781003527978-10</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105016589858?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105016589858?origin=resultslist</a>
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Kundu A., Christ University, Bangalore, India; Datta P.K., Rajatpur Indra Narayan Vidyapith, Bolpur, India; Chakrabarti S., Visva-Bharati (University), India, Department of Economics and Politics, United States
Description
An account of the resource
While the Indian economy grows steadily, its transformation reveals a disturbing pattern. Despite a continuing shift of labour out of agriculture, most of the employment expansion in the non-agricultural sector is concentrated within the low-income-generating informal sector. Dominant discourses consider that this prevalence of the informal sector (and informal employment in general) could be mitigated through economic growth complemented by some institutional reforms. However, our detailed observations on India show that the informal sector is expanding in tandem with the overall capitalist growth driven by the formal sector. We found that an expansion of the formal sector engenders a spread of informality along with its dual (intra-sectoral) tendencies of progression and persistence. While the formal sector-linked relatively large-sized informal firms are progressing, the vast petty-informal segment is trapped in stagnancy. This scenario calls for product-specific cluster formations involving millions of rural-urban petty informal firms. The clusters could be a collective and cohesive instrument to resist the aggressive formal sector dominated by big capital. On the other hand, the formal sector-linked advanced segment of the informal sector can be developed by inducing such linkages. Thus, a dual intra-sectoral trend necessitates a dual policy response. 2026 selection and editorial matter, Sejuti Das Gupta, Shouvik Chakraborty and Taposik Banerjee; individual chapters, the contributors.
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Taylor and Francis
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ISBN: 978-104038875-4; 978-103229188-8;
Language
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English
Type
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Book chapter
Rights
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Restricted Access; Hardcopy may be available in the library
-
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Title
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Faculty Publications
Book Chapter
Faculty Publications- Book Chapter
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Kundu, Baidurjyo; Nagariya, Ramji
Title
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Fake news and its impacts on businesses: Political communication, propaganda, and economic implications
Date
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01-01-2025
Source
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Digital Populism and the Use of Neo-Propaganda and Fake News;pp.323-356
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<a href="https://doi.org/10.4018/979-8-3693-9999-6.ch014" target="_blank" rel="noreferrer noopener">https://doi.org/10.4018/979-8-3693-9999-6.ch014</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105008835686?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105008835686?origin=resultslist</a>
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Kundu B., Christ University, India; Nagariya R., Christ University, India
Description
An account of the resource
Fake news and disinformation have become powerful tools in political communication, particularly in the context of populism and digital propaganda. While misinformation has always been part of political strategy, digital platforms have intensified its spread, allowing political actors to construct narratives that manipulate public opinion, mobilize support, and delegitimize opponents. This study examines fake news as a politically constructed phenomenon, exploring how digital populism and propaganda use disinformation to reinforce ideological divides and influence democratic processes. Using a constructivist framework, we analyze how fake news is socially produced and legitimized within political discourse, shaping perceptions of truth and power. We also investigate how major social media platforms profit from misinformation while simultaneously positioning themselves as arbiters of truth. By focusing on the intersection of political communication, propaganda, and economic incentives, this research highlights the role of digital media in sustaining misinformation ecosystems. 2025, IGI Global Scientific Publishing.
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IGI Global
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ISBN: 979-833730001-6; 979-836939999-6;
Language
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English
Type
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Book chapter
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Restricted Access; Hardcopy may be available in the library
-
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Title
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Faculty Publications
Conference Paper
Faculty Publications- Conference Papers
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Kundu, Seeboli Ghosh; Kundu, Avisek; Sahu, Santosh Kumar; Kalsi, Suchi; Siddhapura, Akshita; Badgayan, Nitesh Dhar
Title
A name given to the resource
SentimentViz: Leveraging RoBERTa in Python for Advanced Sentiment Analysis and Decision-Making for a Famous Indian FMCG (Ayurvedic) Brand
Date
A point or period of time associated with an event in the lifecycle of the resource
01-01-2026
Source
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Smart Innovation, Systems and Technologies;Volume;454 SIST;pp.517-529
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<a href="https://doi.org/10.1007/978-3-032-07837-7_39" target="_blank" rel="noreferrer noopener">https://doi.org/10.1007/978-3-032-07837-7_39</a> <br /><br /><a href="https://www.scopus.com/pages/publications/105036706993?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/105036706993?origin=resultslist</a>
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Kundu S.G., Symbiosis Centre for Management Studies, Symbiosis International (Deemed University), Bengaluru Campus, Pune, India; Kundu A., School of Business Management, Christ University, Bengaluru, India; Sahu S.K., School of Mechanical Engineering, VIT-AP University, Besides A.P. Secretariat, Andhra Pradesh, Amaravati, India; Kalsi S., Symbiosis Centre for Management Studies, Symbiosis International (Deemed University), Bengaluru Campus, Pune, India; Siddhapura A., Symbiosis Centre for Management Studies, Symbiosis International (Deemed University), Bengaluru Campus, Pune, India; Badgayan N.D., KPMG, Mumbai, India
Description
An account of the resource
Indian consumer preferences for Ayurvedic brands increasingly turn to the marketplace for well-being. Ayurveda has a deep-rooted history in emerging economies like India, and its increasing role in health, wellness, and exports contributes to Indias economic development. The consumption and changing lifestyle patterns significantly contribute to achieving the United Nations Sustainable Development Goals (SDGs). The primary objective of this study is to explore consumer sentiment that includes perceptions, feelings, and attitudes toward these natural healthcare products contributing to specific SDG targets, leading to good health and well-being. In a data-driven world where governments and businesses seek insights from vast amounts of unstructured text data, sentiment analysis plays a pivotal role in decision-making. Sentiment analysis helps analyze different aspects of unstructured data, including customer experience and insights generated in terms of usage, challenges, and preferences and ultimately helps manage customer engagement. The sentiment analysis requires understanding the context, grouping similar words, removing unrelated content, and then gauging the sentiment of the text. There has always been a challenge to contextualize and gauze the deeper sentiments and create scalable solutions. To build on this need for deeper sentiment understanding and scalable solutions, SentimentViz is a proposed accelerator as part of this paper that leverages Python and chooses the best methodology for text-mining problems. It enables real-time analysis with robust visualization capabilities: In this study, the SentimentViz accelerator is leveraged to estimate the sentiment of 9 products using a robust data science framework and best-of-the-class ML techniques. The detailed consumer sentiment analysis helped to develop a deeper understanding of the value of FMCG (Ayurvedic products) for an emerging economy like India. This will help marketers build targeted marketing campaigns, brand health monitoring, and customer retention strategies through informed decisions. The Author(s), under exclusive license to Springer Nature Switzerland AG 2026.
Subject
The topic of the resource
Decision-making; Marketing analytics; Natural language processing; Real-time analysis; Sentiment analysis
Publisher
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Springer Science and Business Media Deutschland GmbH
Relation
A related resource
ISSN: 21903018; ISBN: 978-303207836-0;
Language
A language of the resource
English
Type
The nature or genre of the resource
Conference paper
Rights
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Restricted Access; Hardcopy may be available in the library
-
Dublin Core
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Title
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Faculty Publications
Article
Faculty Publications -Articles
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Kundu, Shreyan; Mukhopadhyay, Souradeep; Talukdar, Rahul; Das, Semanti; Adhikari, Subhajit
Title
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Just: towards jute pest classification by combination of supervised learning and triplet loss aided contrastive learning
Date
A point or period of time associated with an event in the lifecycle of the resource
01-01-2025
Source
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Iran Journal of Computer Science;Volume;8;Issue;2;pp.365-378
Identifier
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<a href="https://doi.org/10.1007/s42044-024-00222-8" target="_blank" rel="noreferrer noopener">https://doi.org/10.1007/s42044-024-00222-8</a> <br /><br /><a href="https://www.scopus.com/pages/publications/85217246258?origin=resultslist" target="_blank" rel="noreferrer noopener">https://www.scopus.com/pages/publications/85217246258?origin=resultslist</a>
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Kundu S., Computer Science and Engineering (Artificial Intelligence), Institute of Engineering and Management, Iem Management Building, D-1, Street No. 13, EP Block, Sector V, Bidhannagar, West Bengal, Kolkata, 700091, India; Mukhopadhyay S., Computer Science and Automation, Indian Institute of Science, CV Raman Road, Karnataka, Bangalore, 560012, India; Talukdar R., Computer Science and Engineering (core), Institute of Engineering and Management, Iem Management Building, D-1, Street No. 13, EP Block, Sector V, Bidhannagar, West Bengal, Kolkata, 700091, India; Das S., Department of Lifescience, Christ University, Hosur Main Road, Bhavani Nagar, Karnataka, Bangalore, 560029, India; Adhikari S., Department of Information Technology, RCCIIT KOLKATA, West Bengal, Kolkata, 700015, India
Description
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Jute is a vital agricultural commodity contributing significantly to the GDP of countries like Bangladesh, India, Myanmar, and China. However, because of its inaccuracy and slowness, its vulnerability to pest infestations-which are often handled by manual inspections-poses serious cost concerns. This study suggests a unique method for early and accurate pest identification that combines contrastive and supervised learning. Contrastive learning enhances feature representation by distinguishing between positive and negative samples, ensuring that instances within the same class are closely grouped while maintaining separation between different classes. It reduces false negatives by classifying some samples as negative and others with the same label as positive. Supervised learning enables precise pest identification by aligning features with distinctive characteristics of each class. Metrics including precision, recall, F1 score, ROC curve, and confusion matrix are used to assess the hybrid models performance; the findings show notable accuracy gains over conventional techniques. This scalable and dependable solution lowers losses caused by pests and provides a sustainable method of growing jute using cutting-edge advanced machine-learning techniques. The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.
Subject
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Augmentation; Contrastive learning; Supervised learning; Triplet loss
Publisher
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Springer International Publishing
Relation
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ISSN: 25208438;
Language
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English
Type
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Article
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Restricted Access; Hardcopy may be available in the library
Format
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online
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Articles
Article
Faculty Publications -Articles
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Transport Vehicle Demand Prediction Using Context-Aware Neural Networks
Subject
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LSTM; machine learning; multilayer perceptron; transport vehicle detection
Description
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Transport is an important aspect of trade. The more efficient the transport system, the more trade will flourish. However, sometimes it is the case that vehicles are not available for transport. This necessitates a system which could be able to keep an eye on the demand of transport vehicles. If the demand is fulfilled properly, then trade will flourish in a much better way. Thus, this project aims to keep an eye on the demand of transport vehicles and fulfill it. The study used MLP and LSTM models to work. The project also shows a comparison between the gradual changes and improvements in MLP and LSTM and the type of data used. The study focus was to predict the demand accurately in an area. 2024 by the authors. Licensee MDPI, Basel, Switzerland.
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Kunekar P.; Jadhav K.; Bhagwat A.; Kirar A.; Singh A.; Devesh S.; Bhat R.
Source
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Engineering Proceedings, Vol-59, No. 1
Publisher
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Multidisciplinary Digital Publishing Institute (MDPI)
Date
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2023-01-01
Identifier
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<a href="https://doi.org/10.3390/engproc2023059232" target="_blank" rel="noreferrer noopener">https://doi.org/10.3390/engproc2023059232</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188257311&doi=10.3390%2Fengproc2023059232&partnerID=40&md5=6fbcfd8dc6c00f2db9436afcf9e8dea4" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85188257311&doi=10.3390%2fengproc2023059232&partnerID=40&md5=6fbcfd8dc6c00f2db9436afcf9e8dea4</a>
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All Open Access; Hybrid Gold Open Access
Relation
A related resource
ISSN: 26734591
Format
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Online
Language
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English
Type
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Article
Coverage
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Kunekar P., Department of Information Technology, Vishwakarma Institute of Technology, Maharashtra, Pune, 411037, India; Jadhav K., Department of Artificial Intelligence and Data Science, Vishwakarma Institute of Technology, Maharashtra, Pune, 411037, India; Bhagwat A., Department of Artificial Intelligence and Data Science, Vishwakarma Institute of Technology, Maharashtra, Pune, 411037, India; Kirar A., Department of Artificial Intelligence and Data Science, Vishwakarma Institute of Technology, Maharashtra, Pune, 411037, India; Singh A., Department of Artificial Intelligence and Data Science, Vishwakarma Institute of Technology, Maharashtra, Pune, 411037, India; Devesh S., Department of Business Management, Christ Yeshwantpur Campus (Deemed to be University), Karnataka, Bengaluru, 575073, India; Bhat R., Department of Mechatronics, Rajalakshmi Engineering College (REC), Thandalam, Tamilnadu, 602105, India
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Articles
Article
Faculty Publications -Articles
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Planetary Ball Milling and Tailoring of the Optoelectronic Properties of Monophase SnSe Nanoparticles
Subject
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ball milling; dry and wet grinding; milling rate; nanoparticles; physical property; Tin monoselenide
Description
An account of the resource
Downscaling of tin monoselenide (SnSe) samples to the nanometer regime (~8020nm) without affecting the structure, homogeneity, and optoelectronic properties was carried out by high-energy planetary ball milling (BM). The milling rate was varied from 200rpm to 800rpm by adopting a dry and wet-grinding top-down approach on customized stoichiometric SnSe precursors. The degree of crystallinity was assessed by powder x-ray diffraction (PXRD) and selected area electron diffraction. The lattice parameters, a = 4.435 b = 11.498 and c = 4.148 of the nanoparticles were calculated from the PXRD data. Energy-dispersive x-ray analysis confirmed the chemical homogeneity (49.88:51.12 at.%) of the samples. The effects of rotational velocity as well as mode of grinding on the morphology and the size of SnSe powders were investigated using electron microscopes. The direct optical transition with band gap varied from 1.75eV to 2.28eV was elucidated from UV-Vis-NIR data. Photoluminescence revealed an increase in the intensity of the emission peak at 462.97nm with angular velocities for both types of grinding. The variation of electrical resistivity (36107 ? cm) and mobility (3.451.12 cm2/Vs) with rotational speed was calculated for all the samples. The results obtained for the ball-milled nanoparticles pave the way towards the reduction of particle size, formation of stable morphology, and appreciable crystalline structure quality suitable for solar cell absorbers. Graphical Abstract: [Figure not available: see fulltext.] 2023, The Minerals, Metals & Materials Society.
Creator
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Kunjomana A.G.; Bibin J.; Athira R.C.; Teena M.
Source
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Journal of Electronic Materials, Vol-53, No. 1, pp. 298-311.
Publisher
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Springer
Date
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2024-01-01
Identifier
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<a href="https://doi.org/10.1007/s11664-023-10770-7" target="_blank" rel="noreferrer noopener">https://doi.org/10.1007/s11664-023-10770-7</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85175290728&doi=10.1007%2Fs11664-023-10770-7&partnerID=40&md5=0b237f5f180d77920684580b8cbe82f6" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85175290728&doi=10.1007%2fs11664-023-10770-7&partnerID=40&md5=0b237f5f180d77920684580b8cbe82f6</a>
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Restricted Access
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A related resource
ISSN: 3615235; CODEN: JECMA
Format
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Online
Language
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English
Type
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Article
Coverage
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Kunjomana A.G., Department of Physics and Electronics, CHRIST (Deemed to be University), Karnataka, Bangalore, 560 029, India; Bibin J., Department of Physics and Electronics, CHRIST (Deemed to be University), Karnataka, Bangalore, 560 029, India, Department of Physics, SES College Sreekandapuram, Kerala, Kannur, 670 631, India, Department of Physics, Nirmalagiri College, Kuthuparamba, Kerala, Kannur, 670 701, India; Athira R.C., Department of Physics and Electronics, CHRIST (Deemed to be University), Karnataka, Bangalore, 560 029, India; Teena M., Department of Physics, St. Thomas College, Palai, Kerala, Kottayam, 686 574, India
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Articles
Article
Faculty Publications -Articles
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Effect of supercooling on the microstructural development and optimization of physical properties of melt grown SnSe crystals
Description
An account of the resource
The microstructural development of stoichiometric tin monoselenide (SnSe) crystals grown by vertical BridgmanStockbarger method using an indigenously fabricated furnace has been investigated under high vacuum (~ 10?6 mbar). The ampoule translation rate (tr) and supercooling, ?T (= Tm ? T, where Tm is the melting point and T is the crystallization temperature) were varied in the range, 122mm/h and 20100C respectively. Enhancement of ?T and tr led to constitutional supercooling, inducing compositional changes and non-stoichiometry. Low ?T (2040C) and high tr (1210mm/h) resulted in globules, flakes and cavities. When ?T = 60C and tr = 9 to 7mm/h, mounds were formed with closed contours and ripples, due to atomically rough liquidsolid (l-?) interface. Fine tuning of ?T (60C) and tr (2mm/h) enabled smooth planar interface, so as to yield good quality crystalline structures with periodic atomic deposition promoting crystal growth, layer-by-layer. Energy dispersive analysis by X-rays and powder X-ray diffraction studies revealed appreciable crystallinity, chemical homogeneity and phase purity. The density of crystals estimated from crystallographic data (6.183g/cm3) corroborates with that obtained utilizing Archimedes principle. Thermogravimetric and microindentation analyses established thermal and mechanical stability. The low etch pit density (~ 102 cm?2) manifests nearly perfect growth of crystals than their melt counterparts. UVVisNIR and PL spectra reflected direct transition with an energy gap of 1.32eV, validating immense potential of the grown crystals for photovoltaic applications. 2019, Springer Science+Business Media, LLC, part of Springer Nature.
Creator
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Kunjomana A.G.; Bibin J.; Karthikeyan R.; Varadharajaperumal S.
Source
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Journal of Materials Science: Materials in Electronics, Vol-30, No. 15, pp. 14300-14311.
Publisher
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Springer New York LLC
Date
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2019-01-01
Identifier
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<a href="https://doi.org/10.1007/s10854-019-01799-8" target="_blank" rel="noreferrer noopener">https://doi.org/10.1007/s10854-019-01799-8</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068864413&doi=10.1007%2Fs10854-019-01799-8&partnerID=40&md5=2cab1d9d8ec4bb52f59bcd2ea10d11b1" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068864413&doi=10.1007%2fs10854-019-01799-8&partnerID=40&md5=2cab1d9d8ec4bb52f59bcd2ea10d11b1</a>
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Restricted Access
Relation
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ISSN: 9574522
Format
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Online
Language
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English
Type
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Article
Coverage
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Kunjomana A.G., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560 029, Karnataka, India; Bibin J., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560 029, Karnataka, India; Karthikeyan R., Department of Physics and Electronics, CHRIST (Deemed to be University), Bangalore, 560 029, Karnataka, India; Varadharajaperumal S., Centre for Nano Science and Engineering (CeNSE), Indian Institute of Science (IISc), Bangalore, 560 012, Karnataka, India