Glucose-mediated hydrothermal synthesis and gas sensing characteristics of WO3 hollow microspheres

Choong Yong Lee, Sun Jung Kim, In Sung Hwang, Jong Heun Lee

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Tungsten-coated carbon microspheres were prepared by one-pot hydrothermal reaction of an aqueous solution containing glucose and sodium tungstate. The spheres were converted into WO3 hollow microspheres by the decomposition of their core carbon. The [glucose]/[sodium tungstate] ratio of the stock solution determined not only the morphology of the precursors but also the phase of the powders after calcination. The WO3 hollow microspheres showed a higher gas response and more selective detection of 0.5-2.5 ppm NO2 than WO3 solid and nano-porous microspheres did. The enhanced NO2 sensing characteristics are explained in relation to the surface area, pore volume, and hollow morphology.

Original languageEnglish
Pages (from-to)236-242
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume142
Issue number1
DOIs
Publication statusPublished - 2009 Oct 12

Keywords

  • Carbon template
  • Hollow microspheres
  • NO sensor
  • WO

ASJC Scopus subject areas

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

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