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Improving the sensitivity and selectivity of alcohol sensors based on organic thin-film transistors by using chemically-modified dielectric interfaces

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3 Author(s)
Mori, T. ; Toyota Central R&D Labs., Inc., Nagakute, Japan ; Kikuzawa, Y. ; Noda, Koji

Organic thin-film transistors (OTFTs) with chemically-modified dielectric interfaces are proposed as exhaled-alcohol sensors. Although sensors based on OTFTs have high sensitivity to moisture and would therefore be unsuitable for use as exhaled-gas sensors, it was found that a chemically-modified dielectric interfaces play a significant role in the sensitivity and selectivity of ethanol/moisture. OTFTs fabricated on a surface with low surface free energy, such as (tridecafluoro-1,1,2,2,-tetrahydrooctyl) trimethoxysilane (FTS), octadecylmethoxysilane (OTS) and hexamethyldisilazen (HMDS)-treated surfaces, have low sensitivity to moisture. OTFTs fabricated on a surface with a high ratio of dispersive to polar components of the surface free energy, such as HMDS and OTS-treated surfaces, have high selectivity of ethanol to moisture.

Published in:

Sensors, 2009 IEEE

Date of Conference:

25-28 Oct. 2009