Title: Electrical properties of single and multiple poly(3,4-ethylenedioxythiophene) nanowires for sensing nitric oxide gas
Authors: Lu, Hui-Hsin
Lin, Chia-Yu
Hsiao, Tzu-Chien
Fang, Yueh-Yuan
Ho, Kuo-Chuan
Yang, Dongfang
Lee, Chih-Kung
Hsu, Su-Ming
Lin, Chii-Wann
Department of Biological Science and Technology
Department of Computer Science
Keywords: Poly(3,4-ethylenedioxythiophene;nanowires;Dip-pen nanolithography;Nitric oxide gas sensor
Issue Date: 27-Apr-2009
Abstract: The electrical properties of conducting polymer, poly(3,4-ethylenedioxythiophene) (PEDOT), nanowires were studied to develop nitric oxide (NO) gas sensors with low working temperatures. A nanowire with a diameter of 300 nm was fabricated using dip-pen nanolithography (DPN) across a 55 mu m gap between a pair of electrodes. The electrical properties of single or multiple PEDOT nanowires were examined by plotting the current-voltage (I-V) curves in the range -3 V to +3 V at temperatures between 298 K and 393 K. The conductance of parallel wires was normalized with respect to the dimensions of the fabricated nanowires. The single nanowire exhibited nonlinear conductance associated with hysteresis but multiple wires did not. The currents increased with the temperature and the I-V characteristics were consistent with the power lawG(T)alpha T(alpha) with alpha similar to 5.14 and 5.43. The responses to NO were highly linear and reproducible, indicating that sensing using PEDOT nanowires was reliable with a minimal concentration of NO of 10 ppm. (c) 2009 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.aca.2009.03.006
ISSN: 0003-2670
DOI: 10.1016/j.aca.2009.03.006
Volume: 640
Issue: 1-2
Begin Page: 68
End Page: 74
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