Temperature dependent H2S and Cl2 sensing selectivity of Cr2O3 thin films |
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Authors: | Vishal BalouriaAuthor Vitae Arvind KumarAuthor VitaeA. SinghAuthor Vitae S. SamantaAuthor VitaeA.K. DebnathAuthor Vitae Aman MahajanAuthor VitaeR.K. BediAuthor Vitae D.K. AswalAuthor Vitae S.K. GuptaAuthor VitaeJ.V. YakhmiAuthor Vitae |
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Affiliation: | a Technical Physics Division, Bhabha Atomic Research Center, Mumbai 400 085, India b Department of Physics, Gurunanak Dev University, Amritsar 143 005, India |
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Abstract: | The conductometric gas sensing characteristics of Cr2O3 thin films - prepared by electron-beam deposition of Cr films on quartz substrate followed by oxygen annealing - have been investigated for a host of gases (CH4, CO, NO2, Cl2, NH3 and H2S) as a function of operating temperature (between 30 and 300 °C) and gas concentration (1-30 ppm). We demonstrate that these films are highly selective to H2S at an operating temperature of 100 °C, while at 220 °C the films become selective to Cl2. This result has been explained on the basis of depletion of chemisorbed oxygen from the surface of films due to temperature and/or interaction with Cl2/H2S, which is supported experimentally by carrying out the work function measurements using Kelvin probe method. The temperature dependent selectivity of Cr2O3 thin films provides a flexibility to use same film for the sensing of Cl2 as well as H2S. |
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Keywords: | Cr2O3 thin films Gas sensing XPS Adsorbed oxygen |
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