Title: Pentacene-Based Organic Thin Film Transistors for Ammonia Sensing
Authors: Zan, Hsiao-Wen
Tsai, Wu-Wei
Lo, Yen-ren
Wu, Yu-Mei
Yang, Yuh-Shyong
Department of Biological Science and Technology
Department of Photonics
Institute of Display
Keywords: Ammonia sensor;non-invasive;OTFT;pentacene
Issue Date: 1-Mar-2012
Abstract: Non-invasive ammonia sensors are attractive alternatives for the diagnoses of a variety of chronic diseases such as liver cirrhosis and renal failure. A low cost pentacene-based organic thin film transistor (OTFT) fabricated by a novel and simple process was demonstrated to be highly sensitive and specific for ammonia gas. Various measurement parameters that reflected OTFT device characteristics for ammonia detection were investigated. Significant variations of the turn-on current, intrinsic mobility, and threshold voltage (V-th) were observed while subthreshold swing (S.S.) was almost unchanged to the alteration of ammonia concentration. The OTFT device detected 0.5 similar to 5 ppm concentration ammonia gas at room temperature, which is in the critical range that can distinguish between healthy person and paticents with liver cirrhosis and renal failure. The sensitivity of the device was further enhanced following a simple UV irradiation treatment to modify the functional groups on poly(methyl methacrylate) (PMMA) dielectric layer. Possible interference for ammonia detection such as humidity effect and selectivity among nitrogen, alcohol, carbon dioxide, acetone, methane and ammonia were also examined. We concluded that the proposed pentacene-based OTFT is a promising device for the future application in non-invasive medical diagnoses.
URI: http://dx.doi.org/10.1109/JSEN.2011.2121901
ISSN: 1530-437X
DOI: 10.1109/JSEN.2011.2121901
Volume: 12
Issue: 3
Begin Page: 594
End Page: 601
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