Ammonia gas sensor based on pentacene organic field-effect transistor

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• 作者：Junsheng Yu ; Xinge Yu ; Lin Zhang ; Hongjuan Zeng
• 关键词：Organic field-effect transistor (OFET) ; OFET sensor ; Ammonia gas ; Pentacene ; Response characteristics
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：173
• 期：Complete
• 页码：133-138
• 全文大小：660 K

文摘

Ammonia (NH₃) sensors based on bottom contact organic field-effect transistors (OFETs) were created using pentacene as an active layer and polymerthylmethacrylate (PMMA) as an insulator. The OFET sensors exhibited a change in the electric characteristic such as the threshold voltage, the saturation current, and the field-effect charge carrier mobility when the sensors were exposed to different NH₃ concentrations. Meanwhile, the favorable and rapid NH₃ response characteristics of the OFET sensors were observed from the change in the drain-source current as a function of time, when the sensors were exposed to various cycles of exposure/evacuation of different NH₃ concentrations ranging from 10 to 100 ppm. Moreover, the environmental stability of the OFET sensors to constantly detect the NH₃ gas in air was studied by storing the sensors in air for 30 days.