Glucose-mediated hydrothermal synthesis and gas sensing characteristics of WO3 hollow microspheres |
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Authors: | Choong-Yong Sun-Jung In-Sung Jong-Heun |
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Affiliation: | aDepartment of Materials Science and Engineering, Korea University, Anam-Dong, Sungbuk-Gu, Seoul 136-713, Republic of Korea |
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Abstract: | Tungsten-coated carbon microspheres were prepared by one-pot hydrothermal reaction of an aqueous solution containing glucose and sodium tungstate. The spheres were converted into WO3 hollow microspheres by the decomposition of their core carbon. The glucose]/sodium tungstate] ratio of the stock solution determined not only the morphology of the precursors but also the phase of the powders after calcination. The WO3 hollow microspheres showed a higher gas response and more selective detection of 0.5–2.5 ppm NO2 than WO3 solid and nano-porous microspheres did. The enhanced NO2 sensing characteristics are explained in relation to the surface area, pore volume, and hollow morphology. |
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Keywords: | WO3 NO2 sensor Hollow microspheres Carbon template |
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