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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
Keywords: Detectors de gasos
Gas detectors
Issue Date: 2002
Publisher: IEEE
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.
Note: Reproducció del document publicat a
It is part of: IEEE Sensors Journal, 2002, vol. 2, núm. 4, p. 329- 335.
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ISSN: 1530-437X
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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