Sensors 2011, 11(7), 6509-6516; doi:10.3390/s110706509
A Single Polyaniline Nanofiber Field Effect Transistor and Its Gas Sensing Mechanisms
College of Biomedical Engineering, Zhejiang University, Hangzhou, 310027, China
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Received: 19 April 2011 / Revised: 19 May 2011 / Accepted: 15 June 2011 / Published: 24 June 2011
(This article belongs to the Section Chemical Sensors)
Abstract
A single polyaniline nanofiber field effect transistor (FET) gas sensor fabricated by means of electrospinning was investigated to understand its sensing mechanisms and optimize its performance. We studied the morphology, field effect characteristics and gas sensitivity of conductive nanofibers. The fibers showed Schottky and Ohmic contacts based on different electrode materials. Higher applied gate voltage contributes to an increase in gas sensitivity. The nanofiber transistor showed a 7% reversible resistance change to 1 ppm NH3 with 10 V gate voltage. The FET characteristics of the sensor when exposed to different gas concentrations indicate that adsorption of NH3 molecules reduces the carrier mobility in the polyaniline nanofiber. As such, nanofiber-based sensors could be promising for environmental and industrial applications. View Full-TextKeywords:
polyaniline; single nanofiber; field effect; NH3 sensor
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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MDPI and ACS Style
Chen, D.; Lei, S.; Chen, Y. A Single Polyaniline Nanofiber Field Effect Transistor and Its Gas Sensing Mechanisms. Sensors 2011, 11, 6509-6516.