To access the full text documents, please follow this link: http://hdl.handle.net/2445/8726

Title:	Structural and gas-sensing properties of WO3 nanocrystalline powders obtained by a sol-gel method from tungstic acid
Author:	Jimenez, Ismael; Arbiol i Cobos, Jordi; Cornet i Calveras, Albert; Morante i Lleonart, Joan Ramon
Other authors:	Universitat de Barcelona
Abstract:	WO3 nanocrystalline powders were obtained from tungstic acid following a sol-gel process. Evolution of structural properties with annealing temperature was studied by X-ray diffraction and Raman spectroscopy. These structural properties were compared with those of WO3 nanopowders obtained by the most common process of pyrolysis of ammonium paratungstate, usually used in gas sensors applications. Sol-gel WO3 showed a high sensor response to NO2 and low response to CO and CH4. The response of these sensor devices was compared with that of WO3 obtained from pyrolysis, showing the latter a worse sensor response to NO2. Influence of operating temperature, humidity, and film thickness on NO2 detection was studied in order to improve the sensing conditions to this gas.
Subject(s):	-Detectors de gasos -Nanopartícules -Gas detectors -Nanoparticles
Rights:	(c) IEEE, 2002
Document type:	Article Article - Published version
Published by:	IEEE
Share:

Show full item record