Electrical properties of single and multiple poly(3,4-ethylenedioxythiophene) nanowires for sensing nitric oxide gas

Hui Hsin Lu, Chia Yu Lin, Tzu Chien Hsiao, Yueh Yuan Fang, Kuo Chuan Ho, Dongfang Yang, Chih Kung Lee, Su Ming Hsu, Chii Wann Lin

Research output: Contribution to journalArticle

24 Citations (Scopus)

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 μm 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 law G(T)αTα with α∼ 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.

Original languageEnglish
Pages (from-to)68-74
Number of pages7
JournalAnalytica Chimica Acta
Volume640
Issue number1-2
DOIs
Publication statusPublished - 2009 Apr 27

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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