Journal
RSC ADVANCES
Volume 6, Issue 107, Pages 105171-105179Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra16892b
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Funding
- Sao Paulo Research Foundation (FAPESP) [2013/23886-4, 2014/17343-0, 2015/04306-2, 2015/05916-9]
- National Council for Scientific and Technological Development (CNPq) [444926/2014-3]
- Laboratorio de Sucroquimica e Quimica Analitica
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Nanostructured orthorhombic WO3 center dot 0.33H(2)O, hexagonal h-WO3 and their RGO composites (RGO-WO3 center dot 0.33H(2)Oand RGO-h-WO3) are reported for the purpose of efficient sensing of volatile organic compounds (VOCs) (e.g. acetone, methanol, benzene, toluene, and m-xylene). The materials were prepared at 140 degrees C by one-pot microwave-assisted hydrothermal (MAH) synthesis from Na(2)WO(4 center dot)2H(2)O and graphite oxide (in the case of composite) suspension in acid medium, without using any reducing, organic, or capping reagent. A three-dimensional (3D) nanocolumn bundles-like morphology was obtained for WO3 center dot 0.33H(2)O and RGO-WO3 center dot 0.33H(2)O. Whereas with subsequent heat treatment at 400 degrees C, it was possible to obtain h-WO3 and RGO-h-WO3 composites while preserving the nanocolumn bundles-like morphology. The sensing properties of these materials were investigated by exposing them to various VOCs at room temperature and at 55% relative humidity. We found that all the materials behave as a p-type semiconductor after being exposed to reducing gases. Response to 100 ppm of acetone to the RGO-h-WO3 sensor was observed to be 20% larger than the h-WO3 sensor.
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