Effect of hexagonal WO3 morphology on NH3 sensing

M. Takács, Cs Dücso, Z. Lábadi, A. E. Pap

Research output: Contribution to journalConference article

7 Citations (Scopus)


Tungsten oxide nano-powders were prepared by acidic precipitation from sodium tungstate solution. The alternative processes of the applied hydrothermal method resulted in different structure and morphology of hexagonal WO3nano-crystals. Micro-hotplates with gold electrodes on top to measure sensing layer conductivity were fabricated. WO3 layers of the two morphologies were deposited using capillary dropping technique. Sensor responses were measured up to 220 °C operation temperature for NH3 diluted in synthetic air in the 10-100 ppm range. Test results are compared in terms of conductivity, sensitivity and response time.

Original languageEnglish
Pages (from-to)1011-1014
Number of pages4
JournalProcedia Engineering
Publication statusPublished - Jan 1 2014
Event28th European Conference on Solid-State Transducers, EUROSENSORS 2014 - Brescia, Italy
Duration: Sep 7 2014Sep 10 2014


  • Gas sensor
  • Hexagonal WO
  • Micro-hotplate

ASJC Scopus subject areas

  • Engineering(all)

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