Gas sensing characteristics of WO3 nanoplates prepared by acidification method

Sun Jung Kim, In Sung Hwang, Joong Ki Choi, Jong Heun Lee

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32 Citations (Scopus)

Abstract

WO3·H2O nanoplates were prepared by the acidification of Na2WO4· 2H2O and converted into monoclinic WO3 nanoplates by heat treatment. The sizes, morphologies and preferred orientation of the WO3 nanoplates could be controlled by manipulating the acidity of the solution used for the acidification reaction. All of the WO3 nanoplates showed the selective detection of NO2 in the presence of other reducing gases, such as C2H5OH, CH3COCH3, CO, C 3H8, and H2. The gas response, selectivity, and response speed were optimized by varying the morphology of the sensing materials and operation temperature. The WO3 nanoplates with a mean edge size of 192 nm showed the most rapid gas response along with a high response and selectivity to NO2 when operated at 300 °C.

Original languageEnglish
Pages (from-to)2020-2024
Number of pages5
JournalThin Solid Films
Volume519
Issue number6
DOIs
Publication statusPublished - 2011 Jan 3

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Keywords

  • Gas sensor
  • Nanostructures
  • Powders
  • Scanning electron microscopy
  • Selective detection
  • Tungsten oxide
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

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