Abstract
The gas sensing characteristics of metal oxide-based sensors are found to be influenced by the oxygen vacancies (OVs) that act as selective sites for gas adsorption. To ascertain the effect of OVs on gas sensing properties of tin oxide (SnO2), rare earth (gadolinium)-doped SnO2 thin films have been prepared via electron beam evaporation technique and characterized for structural, optical, and gas sensing properties. Spectroscopic studies revealed the doping dependence of in-plane and sub-bridging OVs that influence the gas interaction properties of Gd-doped SnO2 films. The dominance of sub-bridging OVs leads to enhanced sensing characteristics of 3% Gd-doped SnO2 film towards isopropanol. The gas sensing characteristics of metal oxide-based sensors are found to be influenced by the OVs that act as selective sites for gas adsorption. Among the tested volatile organic compounds (VOCs), the dominance of sub-bridging OVs leads to enhanced sensing characteristics of 3% Gd-doped SnO2 film towards isopropanol.
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Acknowledgements
The authors are thankful to DST, New Delhi, for providing financial support through Project No. INT/UKP/P-21/2018 in support of the present research work.
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Sohal, M.K., Mahajan, A., Gasso, S. et al. Rare earth-tuned oxygen vacancies in gadolinium-doped tin oxide for selective detection of volatile organic compounds. J Mater Sci: Mater Electron 31, 8446–8455 (2020). https://doi.org/10.1007/s10854-020-03379-7
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DOI: https://doi.org/10.1007/s10854-020-03379-7