Topochemical Preparation of WO3 Nanoplates through Precursor H2WO4 and Their Gas-Sensing Performances

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• 作者：Jianmin Ma ; Jun Zhang ; Shurong Wang ; Taihong Wang ; Jiabiao Lian ; Xiaochuan Duan ; Wenjun Zheng
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：September 22, 2011
• 年：2011
• 卷：115
• 期：37
• 页码：18157-18163
• 全文大小：1113K
• 年卷期：v.115,no.37(September 22, 2011)
• ISSN：1932-7455

文摘

Size- and shape-controllable preparation of WO₃ nanoplates has been successfully realized through topochemical transformation of corresponding H₂WO₄ precursors synthesized by a facile solution-phase method. The fluoroboric acid was found to not only provide acid source but also act as a structure-directing agent during the growth process of H₂WO₄ nanoplates in the solution phase. WO₃ nanoplates could be obtained by the two different topochemical transformation methods, hydrothermal treatment of H₂WO₄ nanoplates at the temperature (above 160 掳C) and calcination at higher temperatures in air, based on their similarity of the W鈥揙 octahedral layers in both H₂WO₄ and WO₃. Furthermore, the enhanced ethanol-sensing performance could be attributed to the plate-like morphology, especially the high crystallinity, due to the advantages of the effective adsorption and rapid diffusion of the ethanol molecules.