氢钨青铜的微波辅助合成

Microwave-assisted synthesis of hydrogen tungsten bronze

氢钨青铜是一类光学和电学性能都非常优异的应用前景广阔的材料.快速简便的合成方法对其实际应用具有非常重要的意义.通过微波加热辅助合成了单相的立方相氢钨青铜H 0.25 WO_(3),其空间群和晶胞参数分别为Im-3和a=0.7673(1)nm.样品的微观形貌为均匀的片状颗粒,厚度约50 nm,边长约100~200 nm.该纳米钨青铜中W离子为+5和+6混合价态,在近红外光波段(780~2500 nm)展示了明显的吸收峰,近红外光吸收机制应该包括极化子跃迁和局域表面等离子体共振两种模式.

Hydrogen tungsten bronzes are a class of materials with excellent optical and electrical properties and have a wide application prospect.The rapid and simple synthesis methods are very important to the practical application of hydrogen tungsten bronzes.In this work,the single-phase cubic hydrogen tungsten bronze H 0.25 WO 3 has been synthesized by microwave-assisted heating method.The space group and lattice parameter are Im-3 and a=0.7673(1)nm,respectively.The micro-morphology of sample shows the uniform disk-shaped particles with about 50 nm thickness and 100-200 nm length.The W ions possess the mixed valence of+5 and+6 and the obvious absorption peak appears in the near-infrared wavelength range(780-2500 nm)for nano hydrogen tungsten bronze H 0.25 WO 3.The near-infrared absorption mechanism of sample should be explained by two ways including polaron transition and localized surface plasmon resonance.