The stability, sensitivity and response transients of ZnO, SnO2 and WO3 sensors under acetone, toluene and H2S environments

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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).
Publisher
ELSEVIER SCIENCE SA
Issue Date
2014-07
Language
English
Article Type
Article
Keywords

GAS-SENSING PROPERTIES; HYDROGEN-SULFIDE; SELECTIVE DETECTION; LOW-TEMPERATURE; LUNG-CANCER; BREATH; OXIDE; FILM

Citation

SENSORS AND ACTUATORS B-CHEMICAL, v.197, no.5, pp.300 - 307

ISSN
0925-4005
DOI
10.1016/j.snb.2014.02.043
URI
http://hdl.handle.net/10203/189040
Appears in Collection
MS-Journal Papers(저널논문)
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