Chemical sensors based on nano-hexagonal tungsten oxide: Synthesis and characterization

Balázsi, Csaba and Lukács, István Endre and Balázsi, Katalin (2013) Chemical sensors based on nano-hexagonal tungsten oxide: Synthesis and characterization. NATO SCIENCE FOR PEACE AND SECURITY SERIES B : PHYSICS AND BIOPHYSICS, 2013. pp. 125-138. ISSN 1874-6500

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Abstract

Tungsten oxide based materials have received a great attention in the fabrication of semiconducting oxide based gas sensor devices. In the present work the preparation of nanocrystalline hexagonal WO3 (hex-WO 3) from sodium tungstate solution by acidic precipitation as a nanocrystalline processing route is presented. Metal decorated carbon nanotubes (CNTs) were added to hex-WO3 nanopowder with the aim to further lower the operating temperature of sensors. Hex-WO3/Au-decorated MWCNTs composites were able to detect as low as 100 ppb of NO2, with no need to heat the sensors substrates during operation, which demonstrates the high potential of our new gas sensors. The developed porous tungsten oxide nanofibers might be find application on a special chip designed for gas sensorics. © 2013 Springer Science+Business Media Dordrecht.

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