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Gold Sensitized In2O3 nanocubes for ppb level NO2 gas sensing
Affiliation:1. Sanjay Ghodawat University, Kolhapur, Atigre, 416118, M.S., India;2. School of Nanoscience and Technology, Shivaji University, Kolhapur, 416004, M.S., India;3. Chonnam National University, Gwangju, 500757, South Korea;4. Department of Electronic Engineering, Yeungnam University, Gyeongsan, 38541, South Korea;5. School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 38541, South Korea;1. College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Rare-Earth Functional Materials and Devices Development, Baoji University of Arts and Sciences, Baoji, 721016, China;2. College of Physics and Optoelectronic Technology, Baoji University of Arts and Sciences, Baoji, 721013, China;3. School of Physics, Xidian University, Xi''an, 710071, China;1. School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan, 430074, PR China;2. Zhejiang Engineering Research Center of New Organic Functional Molecules Synthesis and Application, Wenzhou Institute of Industry & Science, Wenzhou, 325006, PR China;3. Wenzhou Advanced Manufacturing Institute, Huazhong University of Science and Technology, Wenzhou, 325006, PR China;1. Group of Chemistry of Advanced Materials (GQMat)- Department of Analytical Chemistry and Physical-Chemistry, Federal University of Ceará– UFC, Campus do Pici, CP 12100, CEP 60451-970, Fortaleza, CE, Brazil;2. Laboratory of Telecommunications and Materials Science and Engineering (LOCEM)- Department of Physics, Federal University of Ceará– UFC, Campus do Pici, CP 12100, CEP 60451-970, Fortaleza, CE, Brazil;3. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Campus do Pici, Bl. 940, CEP 60440-900, Fortaleza, CE, Brazil;4. Department of Physics, Federal University of Maranhão, CEP 65080-805, São Luís, MA, Brazil;1. Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China;2. College of Mechanical Engineering, Chaohu University, Hefei, 238000, China;1. Materials and Structures Division, NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH, 44135, USA;2. University of Toledo, Toledo, OH, USA
Abstract:Hydrothermally synthesized In2O3 nanocubes were sensitized with Au and gas sensing performance is analyzed. The Au sensitization was done using sputtering and gas sensing performance is studied as function of different sputtering time. The catalytic activity of Au particles on In2O3 films increases with the sputtering time but acquires saturation at high sputtering time. The Au sensitization with sputtering time of 5 s was found to show improved sensor response (Rg/Ra) of 8435 than the sensor response of 6876 for pure In2O3 film. The improved sensor response was attributed to the catalytic activity of Au particles on the In2O3 film surface. In addition, Au sensitized In2O3 also demonstrates the sensor response at 60 ppb.
Keywords:Gas sensing  Sensitization  Response time
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