Nanopatterned polycrystalline ZnO for room temperature gas sensing

Shan Wei Fan, Arvind K. Srivastava, Vinayak P. Dravid*

*Corresponding author for this work

Research output: Contribution to journalArticle

73 Scopus citations

Abstract

We demonstrate that the soft e-beam lithography (soft-eBL) fabricated polycrystalline ZnO nanolines show reproducible response to ppm-level H2 and NO2 even at room temperature, due to the intrinsic Joule heating effect in such nanodevices. The Joule heating effect is confirmed by studying the resistance-temperature relationship of the sensor as well as the persistent photoconductivity phenomena in ZnO. We note that Joule heating increases the nanoline temperature to around 72 °C, which enhances the oxidation-reduction reaction at the ZnO surface. Therefore, the nanolines show faster photoresponse than the thin film. These results may help tailor and optimize gas sensor devices for improved performance.

Original languageEnglish (US)
Pages (from-to)159-163
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume144
Issue number1
DOIs
StatePublished - Jan 29 2010

Keywords

  • Gas sensor
  • Room temperature gas sensing
  • UV light
  • ZnO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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