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Anal Chem

Title:		Pulse-Driven Semiconductor Gas Sensors Toward ppt Level Toluene Detection
Author(s):		Suematsu K; Harano W; Oyama T; Shin Y; Watanabe K; Shimanoe K;
Address:		"Department of Advanced Materials Science and Engineering, Faculty of Engineering Sciences , Kyushu University , Kasuga , Fukuoka 816-8580 , Japan. Department of Molecular and Material Science, Interdisciplinary Graduate School of Engineering Science , Kyushu University , Kasuga , Fukuoka 816-8580 , Japan"
Journal Title:		Anal Chem
Year:		2018
Volume:		20180831
Issue:		19
Page Number:		11219 - 11223
DOI:		10.1021/acs.analchem.8b03076
ISSN/ISBN:		1520-6882 (Electronic) 0003-2700 (Linking)
Abstract:		"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-SnO(2)-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"
Keywords:
Notes:		"PubMed-not-MEDLINESuematsu, Koichi Harano, Wataru Oyama, Tokiharu Shin, Yuka Watanabe, Ken Shimanoe, Kengo eng Research Support, Non-U.S. Gov't 2018/08/22 Anal Chem. 2018 Oct 2; 90(19):11219-11223. doi: 10.1021/acs.analchem.8b03076. Epub 2018 Aug 31"