SnO2-based R134a gas sensor: Sensing materials preparation, gas response and sensing mechanism |
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| Authors: | Junchen ChenAuthor VitaeJiaqiang XuAuthor Vitae |
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| Affiliation: | a Department of Chemistry, College of Science, Shanghai University, Shanghai 200444, China
b State Key Laboratory of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China |
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| Abstract: | Undoped SnO2 and porous Al2O3 powders were obtained through a simple chemical precipitation process. SnO2-based gas sensing materials and Al2O3 catalytic coating loaded with a noble metal were prepared by impregnation. The SnO2 and Al2O3 powders were characterized by TEM, SEM, nitrogen adsorption-desorption experiment, FT-IR and in situ XRD. Gas responses of the SnO2-based gas sensors were measured in a static state. The experimental results indicated that the response towards R134a of the SnO2-based gas sensor can be significantly enhanced by loading noble metal and using catalytic coating. The sensor based on a double layer film SnO2 (Au)/Al2O3 (Au) showed satisfactory results including large response, good selectivity, high long-term stability, fast response and recovery, revealing its potential application in the detection of refrigerants and the maintenance of air condition systems. Finally, a gas sensing mechanism for R134a is suggested and proved by bond energy data, FT-IR spectrum and in situ XRD. |
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| Keywords: | SnO2 Catalytic coating Gas sensor R134a Double layer film |
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