钨氧化物纳米结构的合成与表征

采用溶剂热法以WCl₆作为前体合成出了一维和二维的钨氧化物纳米结构，研究了反应溶剂和前体浓度对钨氧化物物相和形貌的影响并评价了各种钨氧化物纳米结构对NO₂气体的敏感性能。XRD、SEM、TEM和XPS的表征结果表明，通过改变溶剂和调整WCl₆浓度，可分别获得单斜的W₁₈O₄₉纳米棒、W₁₈O₄₉纳米线和WO₃纳米片结构。气敏性能测试结果表明，钨氧化物纳米结构对NO₂气体表现出良好的可逆性，与W₁₈O₄₉纳米棒和WO₃纳米片相比，W₁₈O₄₉纳米线对NO₂具有更高的灵敏度。

Synthesis and Characterization of Tungsten Oxide Nanostructures

One- and two-dimensional tungsten oxide nanostructures were synthesized by solvothermal method using tungsten hexachloride (WCl₆) as the precursor. The effects of the solvent and the concentration of WCl₆ on the phase and the morphology of the as-synthesized tungsten oxide nanostructures were investigated and the NO₂-sensing properties were evaluated. X-ray diffraction, field emission scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy were employed to characterize the as-synthesized products and the results indicate that the W₁₈O₄₉ nanorod, W₁₈O₄₉ nanowire and WO₃ nanosheet with monoclinic structure can be formed by adjusting the solvent and WCl₆ concentration. The NO₂-sensing properties measurements show that the synthesized tungsten oxides have reversible response to NO₂ at different concentrations. In comparison with WO₃ nanosheet or W₁₈O₄₉ nanorod, the W₁₈O₄₉ nanowire exhibits much higher response to NO₂ gas.