The stability, sensitivity and response transients of ZnO, SnO2 and WO3 sensors under acetone, toluene and H2S environments
- Authors
- Lee, Ingun; Choi, Seon Jin; Park, Kwang-Min; Lee, Sun Sook; Choi, Sungho; Kim, Il-Doo; Park, C. O.
- Issue Date
- Jul-2014
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- H2S sensor; WO3; SnO2; ZnO; Stability; Sensitivity
- Citation
- SENSORS AND ACTUATORS B-CHEMICAL, v.197, pp.300 - 307
- Indexed
- SCIE
SCOPUS
- Journal Title
- SENSORS AND ACTUATORS B-CHEMICAL
- Volume
- 197
- Start Page
- 300
- End Page
- 307
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/159531
- DOI
- 10.1016/j.snb.2014.02.043
- ISSN
- 0925-4005
- Abstract
- Chemoresistive H2S sensors using various oxide nanoparticles were prepared and heat-treated at 600 degrees C in an effort to define halitosis in human breath. WO3, ZnO, and SnO2 were tested as sensing materials, among which WO3 showed the highest stability to H2S. XPS analysis showed a metal sulfate peak on the surface of ZnO and SnO2, which causes a recovery problem after 2 ppm H2S exposure. On the contrary, the WO3 sensor showed a stable signal in long-term operation in the presence of H2S gas.
WO3 gas sensors decorated with various catalytic metals were fabricated to investigate their sensing properties in the 0.2-5 ppm H2S range with 80% relative humidity (RH). A 0.03 wt% Au-doped WO3 sensor exhibited excellent H2S sensitivity (R-air/R-gas = 12.40 at 2 ppm) toward H2S, whereas pure WO3 showed a sensitivity of 4.85 with negligible interference from the volatile organic compounds (VOCs).
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