Sensors and Materials
ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Sensors and Materials,
Volume 30, Number 5(1) (2018)

Copyright(C) MYU K.K. All Rights Reserved.
pp. 1001-1008
S&M1557
https://doi.org/10.18494/SAM.2018.1808
Published: May 18, 2018

Gas-sensitive Field-effect Transistor Incorporating Polymer Layer and Porous Metal Electrode in the Gate Structure [PDF]

Toshihiro Yoshizumi, Tatsuro Goda, Akira Matsumoto, and Yuji Miyahara

(Received November 16, 2017; Accepted December 25, 2017)

Keywords: gas-sensitive FET, FET-based sensor, porous gate electrode, stationary phase, volatile organic compound sensing

Field-effect transistor (FET)-based sensors have attractive potential for fabricating miniaturized sensor arrays by semiconductor processes. In this work, a gas-sensitive FET incorporating a polyethylene glycol (PEG) film and porous Pt electrode in the gate structure is proposed. In this new type of gas-sensitive FET, the PEG layer provides a dielectric layer that interacts with gaseous molecules (i.e., a stationary phase), while the porous Pt gate electrode allows gaseous molecules to effectively access the PEG layer. Features of the response pattern, such as peak height, recovery time, and peak shape unique to the PEG-modified FET sensor, were observed when exposed to vapor of volatile organic compounds (VOCs). The sensing mechanism of the gas-sensitive FET is discussed in terms of capacitance changes of the gate structure induced by gaseous molecule adsorption onto the stationary phase. A variety of polymeric materials might be used to modify the gate, and the proposed structure shows promise as a platform for cross-reactive FET-based gas sensor arrays for pattern recognition.

Corresponding author: Yuji Miyahara


Cite this article
Toshihiro Yoshizumi, Tatsuro Goda, Akira Matsumoto, and Yuji Miyahara, Gas-sensitive Field-effect Transistor Incorporating Polymer Layer and Porous Metal Electrode in the Gate Structure, Sens. Mater., Vol. 30, No. 5, 2018, p. 1001-1008.


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