S&M3454 Research Paper of Special Issue
Published: November 30, 2023
Sensing Behavior of Adsorption/Combustion-type Gas Microsensors to Various Alcoholic Vapors [PDF]
Takeo Hyodo, Kazunori Nagae, Taro Ueda, Takahiko Sasahara, and Yasuhiro Shimizu
(Received March 24, 2023; Accepted July 25, 2023)
Keywords: adsorption/combustion-type gas microsensor, alcohol, dynamic response, static response, volatile organic compound
Adsorption/combustion-type gas microsensors utilizing γ-Al2O3 co-loaded with m wt% noble metal and 10 wt% metal oxide [mN/10MO/γ-Al2O3, N: noble metal (Pd or Pt), MO: metal oxide (CeO2 or Bi2O3)] were fabricated, and their sensor-signal profiles to five types of alcoholic vapor (ethanol, 1-propanol, 1-butanol, 1-pentanol, and 1-hexanol) were investigated and analyzed by differential and integral processing. The sensor-signal profiles largely depended on the types of N and MO as well as the amount of N loaded (m). The dynamic response arises from the flash catalytic combustion of the alcohols at 450 °C and their related components (partially oxidized and/or condensed products) adsorbed at 150 °C on the sensing film, and the 10Pt/10CeO2/γ-Al2O3 and 10Pd/10CeO2/γ-Al2O3 sensors showed the largest dynamic responses to 1000 ppm ethanol and 1-hexanol, respectively, among all the sensors tested. These sensors showed sufficiently large dynamic responses even to 10 ppm alcohols. The differential processing of their sensor-signal profiles was valuable in precisely finding slight changes and differences in their sensing behaviors and providing considerable information for data processing.Corresponding author: Takeo Hyodo
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Cite this article
Takeo Hyodo, Kazunori Nagae, Taro Ueda, Takahiko Sasahara, and Yasuhiro Shimizu , Sensing Behavior of Adsorption/Combustion-type Gas Microsensors to Various Alcoholic Vapors , Sens. Mater., Vol. 35, No. 11, 2023, p. 3851-3861.