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

Ani, A and Poornesh, P and Nagaraja, KK and Hegde, G and Kolesnikov, E and Shchetinin, IV and Antony, A and Kulkarni, SD (2021) Evaluation of spray pyrolysed In:ZnO nanostructures for CO gas sensing at low concentration. In: Journal of Materials Science: Materials in Electronics .

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Abstract

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. © 2021, The Author(s).

Item Type:	Journal Article
Publication:	Journal of Materials Science: Materials in Electronics
Publisher:	Springer
Additional Information:	The copyright for this article belongs to Authors
Keywords:	Carbon films; Carbon monoxide; Chemical detection; Gas detectors; Grain boundaries; II-VI semiconductors; Metallic films; Optical films; Oxide minerals; Photoluminescence; Spray pyrolysis; X ray diffraction; X ray photoelectron spectroscopy; Zinc oxide; Zinc sulfide, Crystalline size; Gas sensing properties; Hexagonal wurtzite structure; High surface area; Low concentrations; Oxygen vacancy defects; Spray-pyrolysis techniques; ZnO nanostructures, Thin films
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	28 Nov 2021 09:03
Last Modified:	28 Nov 2021 09:03
URI:	http://eprints.iisc.ac.in/id/eprint/69955

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