Different synthetical routes involving several solvents for obtaining WO3powders, suitable for gas sensing have been studied. Aqueous and alcoholic solvents proved to be the most promising media to grow nanometric particles. Among these, a modified sol-gel route that involves ethanol and a di-chetone, highlighted a more homogeneous grain-size distribution. The structure and morphology evolution of pure WO3powders with time and annealing temperature have been studied. The study of the energy barrier and conductance versus temperature allows to understand the reason for the high response of WO3to oxidising gases and its lack of sensitivity to reducing agents. Films of WO3responded to NO2, sensing as low a gas concentration as 200ppb. © 2003 Elsevier B.V. All rights reserved.
Aqueous and alcoholic syntheses of tungsten trioxide powders for NO2 detection / Guidi, V.; Blo, M.; Butturi, M. A.; Carotta, M. C.; Galliera, S.; Giberti, A.; Malagu, C.; Martinelli, G.; Piga, M.; Sacerdoti, M.; Vendemiati, B.. - In: SENSORS AND ACTUATORS. B, CHEMICAL. - ISSN 0925-4005. - 100:1-2(2004), pp. 277-282. (Intervento presentato al convegno New Materials and Technologies in Sensor Applications, Proceedings tenutosi a Strasbourg, fra nel 2003) [10.1016/j.snb.2003.12.055].
Aqueous and alcoholic syntheses of tungsten trioxide powders for NO2 detection
Butturi M. A.;
2004
Abstract
Different synthetical routes involving several solvents for obtaining WO3powders, suitable for gas sensing have been studied. Aqueous and alcoholic solvents proved to be the most promising media to grow nanometric particles. Among these, a modified sol-gel route that involves ethanol and a di-chetone, highlighted a more homogeneous grain-size distribution. The structure and morphology evolution of pure WO3powders with time and annealing temperature have been studied. The study of the energy barrier and conductance versus temperature allows to understand the reason for the high response of WO3to oxidising gases and its lack of sensitivity to reducing agents. Films of WO3responded to NO2, sensing as low a gas concentration as 200ppb. © 2003 Elsevier B.V. All rights reserved.
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