Polymeric nanowire chemical sensor

Haiqing Liu, Jun Kameoka, David A. Czaplewski, Harold G. Craighead

Research output: Contribution to journalArticle

646 Scopus citations

Abstract

We have used a nonlithographic deposition process to form single polymeric nanowire chemical sensors. Oriented polyaniline nanowires, with diameters on the order of 100 nm, were deposited on gold electrodes. The devices showed a rapid and reversible resistance change upon exposure to NH3 gas at concentrations as low as 0.5 ppm. The well-defined single-wire geometry allows for the characterization of the wire material and the device response. The response times of nanowire sensors with various diameters correspond to radius-dependent differences in the diffusion time of ammonia gas into the wires. The nanowire deposition process, utilizing a scanned microfabricated electrospinning source, presents a general method for interfacing polymeric nanowire devices with microfabricated structures.

Original languageEnglish (US)
Pages (from-to)671-675
Number of pages5
JournalNano Letters
Volume4
Issue number4
DOIs
StatePublished - Apr 1 2004

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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