Material and gas-sensing properties of tungsten oxide nanorod thin-films

Yong Shin Kim, Kwangyeol Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Tungsten oxide thin-films were deposited simply by drop-casting a solution containing single-crystalline and monodispersed W 18O 49 nanorods prepared by a large-scale colloidal synthesis route. They were verified to be highly porous, nonstoichiometric, and monoclinic crystal structure only with little carbon impurities. These material properties heavily reflect relevant nanostructural characteristics of the nanorods acting as a basic building block. It could be comprehended by the observed structure of randomly arranged tungsten oxide agglomerates formed by favorable parallel alignment of individual nanorod units. Tungsten oxide nanorod sensors exhibit sensitive detection capability even at room temperature to various reducing volatile organic compounds (VOCs). This anomalous performance seems to result from unique nanostructural features of the thin-films, allowing a high surface-to-volume ratio and a considerable amount of active sensing sites due to the highly anisotropic, nonstoichiometric structure of W 18O 49 nanorods.

Original languageEnglish
Pages (from-to)2463-2468
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number4
DOIs
Publication statusPublished - 2009 Apr

Keywords

  • Gas sensor
  • Metal oxide semiconductor
  • Tungsten oxide nanorod

ASJC Scopus subject areas

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

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