Structural and gas-sensing properties of WO3 nanocrystalline powders obtained by a sol-gel method from tungstic acid

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dc.contributor	Universitat de Barcelona
dc.contributor.author	Jimenez, Ismael
dc.contributor.author	Arbiol i Cobos, Jordi
dc.contributor.author	Cornet i Calveras, Albert
dc.contributor.author	Morante i Lleonart, Joan Ramon
dc.date	2009-06-18T08:35:32Z
dc.date	2009-06-18T08:35:32Z
dc.date	2002
dc.identifier.citation	1530-437X
dc.identifier.citation	506412
dc.identifier.uri	http://hdl.handle.net/2445/8726
dc.format	7 p.
dc.format	application/pdf
dc.language.iso	eng
dc.publisher	IEEE
dc.relation	Reproducció del document publicat a http://dx.doi.org/10.1109/JSEN.2002.803747
dc.relation	IEEE Sensors Journal, 2002, vol. 2, núm. 4, p. 329- 335.
dc.relation	http://dx.doi.org/10.1109/JSEN.2002.803747
dc.rights	(c) IEEE, 2002
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	Detectors de gasos
dc.subject	Nanopartícules
dc.subject	Gas detectors
dc.subject	Nanoparticles
dc.title	Structural and gas-sensing properties of WO3 nanocrystalline powders obtained by a sol-gel method from tungstic acid
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion
dc.description.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.

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