Evaluation of spray pyrolysed In:ZnO nanostructures for CO gas sensing at low concentration

Aninamol, Ani and Poornesh, P and Nagaraja, K K and Hegde, Gopalkrishna and Kolesnikov, E and Shchetinin, Igor V and Antony, Albin and Kulkarni, Suresh D (2021) Evaluation of spray pyrolysed In:ZnO nanostructures for CO gas sensing at low concentration. Journal of Materials Science: Materials in Electronics, 32. pp. 22599-22616. ISSN 0957-4522

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Herein, we report the role of indium (In) on the carbon monoxide sensing of ZnO thin films using a low-cost spray pyrolysis technique. The decrease in crystalline size was observed from XRD studies and hexagonal wurtzite structure was confirmed. Photoluminescence and XPS studies proved the presence of various defects in the films. The gas-sensing properties of films toward carbon monoxide (CO) gas indicate that 15 wt% of In in ZnO thin films (IZO) exhibit high response (1.84) to a low concentration of the gas (1 ppm) at 300 �C compared to undoped ZnO (0.53). The observed high response of 15 wt% IZO can be mainly endorsed to the oxygen vacancy defects as observed from the photoluminescence and XPS analysis. Further, the high response is complemented by high surface area and smaller grain size (* 13.1 nm) with well-defined grain boundaries as evident from SEM analysis as well as XRD studies

Item Type: Article
Subjects: Departments at MU > Atomic Molecular Physics
Engineering > MIT Manipal > Physics
Depositing User: MIT Library
Date Deposited: 27 Sep 2021 05:43
Last Modified: 27 Sep 2021 05:45
URI: http://eprints.manipal.edu/id/eprint/157439

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