High-Performance Ammonia Sensing with Citrus Hystrix-Mediated ZnO Nanoparticles in TFT-Based Devices
Citrus Hystrix; Green process; NH3 sensing; Thin-film transistors; ZnO nanoparticles
We present a sustainable green synthesis approach for zinc oxide nanoparticles (ZnO NPs) utilizing Citrus hystrix leaf extract and their application as an active medium in a thin film transistor (TFT)-based ammonia gas sensor. For the first time, ZnO NPs derived from Citrus hystrix serve as a receptor layer in a thin film transistor (TFT) device, enabling selective ammonia detection at a significantly reduced initiation temperature. The synthesized ZnO NPs, with a wurtzite structure and an average crystallite size of approximately 14 nm, are deposited onto the TFT sensor without the need for an external conducting layer. The sensor demonstrates excellent sensitivity and selectivity, achieving a maximum response of ~85 % at 20 ppm, with a rapid response time of about 10 seconds at room temperature. Notably, the TFT device exhibits an electron mobility of ~10.2 cm2/V ? s and a high on/off ratio (>10?) at room temperature. The sensing mechanism is attributed to the oxidation-reduction interactions between surface-adsorbed oxygen and NH? molecules on the ZnO NPs, which modulate the device's electrical conductivity. This work underscores the importance of eco-friendly fabrication of high-performance, durable devices, addressing contemporary environmental and economic concerns. 2025 Wiley-VCH GmbH.
Narayana, Ashwath; Mahendra Prashanth, K.; Veerabhadraswamy, B.N.; Mareddi, Bharathkumar; Khatavi, Santosh Y; Prasad, B.L.V.; Yelamaggad, C.V.
ChemNanoMat;Volume;11;Issue;3;Article No.;e202400491;
Restricted Access; Hardcopy may be available in the library
https://doi.org/10.1002/cnma.202400491 https://www.scopus.com/pages/publications/105001090982?origin=resultslist
Narayana A., Department of Electronics & Communication Engineering, Don Bosco Institute of Technology, Kengeri, Bengaluru, 560074, India; Mahendra Prashanth K., V, SJB Institute of Technology, Health & Education City, Karnataka, Kengeri, Bengaluru, 560060, India; Veerabhadraswamy B.N., Department of Chemistry, G M Institute of Technology, P B Road, Karnataka, Davanagere, India; Mareddi B., Department of Electronics & Communication Engineering, Christ University, Kengeri, Bengaluru, India; Khatavi S.Y., Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru, India; Prasad B.L.V., Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru, India; Yelamaggad C.V., Department of Chemistry, G M Institute of Technology, P B Road, Karnataka, Davanagere, India, Department of Electronics & Communication Engineering, Christ University, Kengeri, Bengaluru, India, Centre for Nano and Soft Matter Sciences, Arkavathi, Survey No. 7, Shivanapura, Dasanapura Hobli, Bengaluru, India, Department of Chemistry, Manipal Institute of Technology, Manipal Academy of Higher Education, Karnataka, Manipal, 576104, India