Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots
- Title
- Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots
- Creator
- Varghese A.A.; Kuriakose E.; Jose J.; Aryal S.; Khanal R.; Anila E.I.
- Description
- Quantum confined uncapped and chitosan capped nanoparticles of ZnAl2O4 synthesized by microwave-assisted solgel method were investigated by structural analysis and optical techniques. X-ray diffraction studies confirmed the formation of cubic spinels with crystallite size 4.5 nm and 3.4 nm, respectively for uncapped and chitosan capped ZnAl2O4 nanoparticles. Chitosan capping produced a blue shift in bandgap energy (3.84 to 3.94 eV) agreeing with size effects according to the Brus equation. A blue shift in emission peak and enhancement in photoluminescence intensity was also observed upon chitosan capping. The electronic band structure and the density of states of the bulk spinel were also calculated using density functional theory. The effective masses of electrons and holes estimated based on the band structure were used to extract the excitonic Bohr radius. 2021 Elsevier B.V.
- Source
- Applied Surface Science, Vol-579
- Date
- 2022-01-01
- Publisher
- Elsevier B.V.
- Subject
- Bandgap; Brus equation; Chitosan; Density functional theory; Microwave assisted solgel synthesis; Photoluminescence; Quantum confinement; Zinc aluminate
- Coverage
- Varghese A.A., Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India; Kuriakose E., Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India; Jose J., Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India; Aryal S., Department of Physics, Michigan Technological University, Houghton, 49931, MI, United States; Khanal R., Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, 37831, TN, United States; Anila E.I., Optoelectronic and Nanomaterials Research Laboratory, Department of Physics, Union Christian College, Aluva, 683102, Kerala, India, Department of Physics, CHRIST (Deemed to be University), Bengaluru, 560029, India
- Rights
- All Open Access; Bronze Open Access; Green Open Access
- Relation
- ISSN: 1694332; CODEN: ASUSE
- Format
- Online
- Language
- English
- Type
- Article
Collection
Citation
Varghese A.A.; Kuriakose E.; Jose J.; Aryal S.; Khanal R.; Anila E.I., “Investigations on the electronic properties and effect of chitosan capping on the structural and optical properties of zinc aluminate quantum dots,” CHRIST (Deemed To Be University) Institutional Repository, accessed February 25, 2025, https://archives.christuniversity.in/items/show/15078.