Novel fabrication of an SnO2 nanowire gas sensor with high sensitivity

Young Jin Choi, In Sung Hwang, Jae Gwan Park, Kyoung Jin Choi, Jae Hwan Park, Jong Heun Lee

Research output: Contribution to journalArticle

299 Citations (Scopus)

Abstract

We fabricated a nanowire-based gas sensor using a simple method of growing SnO2 nanowires bridging the gap between two pre-patterned Au catalysts, in which the electrical contacts to the nanowires are self-assembled during the synthesis of the nanowires. The gas sensing capability of this network-structured gas sensor was demonstrated using a diluted NO2. The sensitivity, as a function of temperature, was highest at 200°C and was determined to be 18 and 180 when the NO2 concentration was 0.5 and 5 ppm, respectively. Our sensor showed higher sensitivity compared to different types of sensors including SnO2 powder-based thin films, SnO 2 coating on carbon nanotubes or single/multiple SnO2 nanobelts. The enhanced sensitivity was attributed to the additional modulation of the sensor resistance due to the potential barrier at nanowire/nanowire junctions as well as the surface depletion region of each nanowire.

Original languageEnglish
Article number095508
JournalNanotechnology
Volume19
Issue number9
DOIs
Publication statusPublished - 2008 Feb 5

ASJC Scopus subject areas

  • Materials Science(all)
  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials

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