Pulse-Driven Semiconductor Gas Sensors Toward ppt Level Toluene Detection

Koichi Suematsu, Wataru Harano, Tokiharu Oyama, Yuka Shin, Ken Watanabe, Kengo Shimanoe

研究成果: ジャーナルへの寄稿記事

5 引用 (Scopus)

抄録

Improvements in the responses of semiconductor gas sensors and reductions in their detection limits toward volatile organic compounds (VOCs) are required in order to facilitate the simple detection of diseases, such as cancer, through human-breath analysis. In this study, we introduce a heater-switching, pulse-driven, micro gas sensor composed of a microheater and a sensor electrode fabricated with Pd-SnO2-clustered nanoparticles as the sensing material. The sensor was repeatedly heated and allowed to cool by the application of voltage to the microheater; the VOC gases penetrate into the interior of the sensing layer during its unheated state. Consequently, the utility factor of the pulse-driven sensor was greater than that of a conventional, continuously heated sensor. As a result, the response of the sensor to toluene was enhanced; indeed, the sensor responded to toluene at levels of 1 ppb. In addition, according to the relationship between its response and concentration of toluene, the pulse-driven sensor in this report can detect toluene at concentrations of 200 ppt and even lower. Therefore, the combination of a pulse-driven microheater and a suitable material designed to detect toluene resulted in improved sensor response, and facilitated ppt-level toluene detection. This sensor may play a key role in the development of medical diagnoses based on human breath.

元の言語英語
ページ(範囲)11219-11223
ページ数5
ジャーナルAnalytical chemistry
90
発行部数19
DOI
出版物ステータス出版済み - 10 2 2018

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Toluene
Chemical sensors
Semiconductor materials
Sensors
Volatile Organic Compounds
Gases
Nanoparticles
Electrodes
Electric potential

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

これを引用

Pulse-Driven Semiconductor Gas Sensors Toward ppt Level Toluene Detection. / Suematsu, Koichi; Harano, Wataru; Oyama, Tokiharu; Shin, Yuka; Watanabe, Ken; Shimanoe, Kengo.

:: Analytical chemistry, 巻 90, 番号 19, 02.10.2018, p. 11219-11223.

研究成果: ジャーナルへの寄稿記事

Suematsu, Koichi ; Harano, Wataru ; Oyama, Tokiharu ; Shin, Yuka ; Watanabe, Ken ; Shimanoe, Kengo. / Pulse-Driven Semiconductor Gas Sensors Toward ppt Level Toluene Detection. :: Analytical chemistry. 2018 ; 巻 90, 番号 19. pp. 11219-11223.
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