Nanostructured mesoporous tungsten oxide for gas sensor applications

Emma Rossinyol; Jordi Arbiol; Andreu Marsal; Francesca Peiro; Albert Cornet; Joan Ramon Morante; Leonid A. Solovyov; Bozhi Tian; Bo Tu; Dongyuan Zhao

doi:10.1117/12.608272

28 June 2005 Nanostructured mesoporous tungsten oxide for gas sensor applications

Emma Rossinyol, Jordi Arbiol, Andreu Marsal, Francesca Peiro, Albert Cornet, Joan Ramon Morante, Leonid A. Solovyov, Bozhi Tian, Bo Tu, Dongyuan Zhao

Author Affiliations +

Proceedings Volume 5838, Nanotechnology II; (2005) https://doi.org/10.1117/12.608272
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

Abstract

Due to their simple implementation, low cost and good reliability for real-time control systems, semiconductor gas sensors offer good advantages with respect to other gas sensor devices. As gas adsorption is a surface effect, one of the most important parameter to tailor the sensitivity of the sensor material is to increase the surface area. For these propose, mesoporous oxides have been synthesized. Nanostructured mesoporous materials present a large and controllable pore size and high surface are. For the preparation of ordered nanostructure arrays, a hard template method has been used. This method presents some advantages when compared with a soft template method, especially in its specific topological stability, veracity, predictability and controllability. Moreover, with this hard template method we can obtain crystalline mesoporous oxides, with small particle size and high surface area. We have used SBA-15 (two-dimensional hexagonal structure) and KIT-6 (three-dimensional cubic structure) as a template for the synthesis of different crystalline mesoporous WO₃ with a particle size about 8-10 nm and high surface area. Low angle XRD spectra show a high order mesoporous structure, without rests of silica template. TEM confirms that the silica host has been completely removed; therefore, the nanowires constitute a self-supported superlattice. HRTEM studies have been focused on the detailed structural characterization of these materials. Electrical characterization of the sensor response in front of NO₂ has been performed. Some catalytic additives have been also introduced, in order to increase the sensitivity of the material.

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Emma Rossinyol, Jordi Arbiol, Andreu Marsal, Francesca Peiro, Albert Cornet, Joan Ramon Morante, Leonid A. Solovyov, Bozhi Tian, Bo Tu, and Dongyuan Zhao "Nanostructured mesoporous tungsten oxide for gas sensor applications", Proc. SPIE 5838, Nanotechnology II, (28 June 2005); https://doi.org/10.1117/12.608272

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KEYWORDS

Oxides

Chromium

Sensors

Transmission electron microscopy

Crystals

Gas sensors

Silica

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