MoO3:In2O3 binary oxide thin films as CO gas sensor
https://doi.org/10.17586/2220-8054-2020-11-4-424-433
Abstract
Thin films of binary oxides (MoO3–In2O3) of different normality proportions of 0.1N:0.1N, 0.2N:0.1N, 0.3N:0.1N, 0.1N:0.2N, 0.2N:0.2N, 0.3N:0.2N, 0.1N:0.3N, 0.2N:0.3N and 0.3N:0.3N were prepared by a spray pyrolysis technique on glass substrates at 400◦C. The prepared films were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive analysis by x-ray spectra (EDAX). The electrical and gas sensing properties of the films were studied using static gas sensing apparatus. The electrical analysis confirmed that the resistivity of films increased by adding MoO3 as the dopant in In2O3. The maximum resistivity of film was found 1.75×104 Ωm for 0.3N (MoO3) and 0.1N (In2O3) binary oxide films. The films were tested against five different target gases. The composition ratio 0.3N:0.1N films showed the 70.50% sensitivity for 300 ppm CO gas at 150◦C. The response time (15 s) and recovery time (25 s) was found to be quick. The % selectivity was maximum for 0.3N:0.1N films.
Supporting agencies: Authors are thankful to Management of Arts, Science, Commerce College, Kalwan (Manur) Nashik, Principal, MSG College, Malegaon for providing research infrastructure and Department of Physics, Savitribai Phule Pune University, Pune for the characterization facility.
About the Authors
Nimba Kothawade
Department of Physics, Arts, Commerce and Science College
India
India
Kalwan (Manur), Nashik
Jitendra Borse
Department of Physics, Late Pushpadevi Patil Arts and Science College
India
India
Risod
Vikas Deshmane
Department of Physics, SICES Degree College
India
India
Ambernath, Thane, Maharashtra
Arun Patil
Research centre in electronics science, LVH College
India
India
Panchavati, Nashik
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Review
For citations:
Kothawade N., Borse J., Deshmane V., Patil A. MoO3:In2O3 binary oxide thin films as CO gas sensor. Nanosystems: Physics, Chemistry, Mathematics. 2020;11(4):424–433. https://doi.org/10.17586/2220-8054-2020-11-4-424-433
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