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Hoa, Nguyen Duc; Duy, Nguyen Van; Hieu, Nguyen Van
Materials research bulletin, February 2013, 2013-2-00, Letnik: 48, Številka: 2Journal Article
Display omitted ► Mesoporous WO3 nanoplate monoliths were obtained by direct templating synthesis. ► Enable effective accession of the analytic molecules for the sensor applications. ► The WO3 sensor exhibited a high performance to NO2 gas at low temperature. Controllable synthesis of nanostructured metal oxide semiconductors with nanocrystalline size, porous structure, and large specific surface area is one of the key issues for effective gas sensor applications. In this study, crystalline mesoporous tungsten oxide nanoplate-like monoliths with high specific surface areas were obtained through instant direct-templating synthesis for highly sensitive nitrogen dioxide (NO2) sensor applications. The copolymer soft template was converted into a solid carbon framework by heat treatment in an inert gas prior to calcinations in air to sustain the mesoporous structure of tungsten oxide. The multidirectional mesoporous structures of tungsten oxide with small crystalline size, large specific surface area, and superior physical characteristics enabled the rapid and effective accession of analytic gas molecules. As a result, the sensor response was enhanced and the response and recovery times were reduced, in which the mesoporous tungsten oxide based gas sensor exhibited a superior response of 21,155% to 5ppm NO2. In addition, the developed sensor exhibited selective detection of low NO2 concentration in ammonia and ethanol at a low temperature of approximately 150°C.
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