Facile control of C2H5OH sensing characteristics by decorating discrete Ag nanoclusters on SnO2 nanowire networks

In Sung Hwang, Joong Ki Choi, Hyung Sik Woo, Sun Jung Kim, Se Yeon Jung, Tae Yeon Seong, Il Doo Kim, Jong Heun Lee

Research output: Contribution to journalArticle

189 Citations (Scopus)

Abstract

The effect of Ag decoration on the gas sensing characteristics of SnO 2 nanowire (NW) networks was investigated. The Ag layers with thicknesses of 5-50 nm were uniformly coated on the surface of SnO2 NWs via e-beam evaporation, which were converted into isolated or continuous configurations of Ag islands by heat treatment at 450 °C for 2 h. The SnO2 NWs decorated by isolated Ag nano-islands displayed a 3.7-fold enhancement in gas response to 100 ppm C2H5OH at 450 °C compared to pristine SnO2 NWs. In contrast, as the Ag decoration layers became continuous, the response to C2H 5OH decreased significantly. The enhancement and deterioration of the C2H5OH sensing characteristics by the introduction of the Ag decoration layer were strongly governed by the morphological configurations of the Ag catalysts on SnO2 NWs and their sensitization mechanism.

Original languageEnglish
Pages (from-to)3140-3145
Number of pages6
JournalACS Applied Materials and Interfaces
Volume3
Issue number8
DOIs
Publication statusPublished - 2011 Aug 24

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Keywords

  • Ag catalyst
  • SnOnanowires
  • electronic sensitization
  • gas sensor

ASJC Scopus subject areas

  • Materials Science(all)

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