三维TiO2纳米材料的制备及其光电性能的研究

采用溶剂热法,在环己烷-水体系中通过控制温度,在环己烷-水的液-液界面获得了由一维纳米棒组装而成的3种不同形貌的三维（3D）TiO2纳米材料,并对其组装的染料敏化太阳能电池（DSSC）的光电性能进行了分析。研究结果表明,温度对3DTiO2纳米材料的形貌有很大的影响,在60℃时,一维（1D）纳米棒只是组装成简单的3D球状结构;当温度升高至90℃和120℃时,形貌发生了明显的变化,球状结构转变为花状结构;当温度升高至150℃时,获得了海胆型形貌。由于形貌和粒径的影响,3DTiO2纳米材料对光的吸收能力以及比表面积均有明显地变化,从而导致其组装的DSSC的总光电转换效率差异很大,3D海胆型TiO2纳米材料组装的DSSC的总光电转换效率最大。

The preparation and optical property of three-dimensional TiO2 nanomaterials

Three-dimensional（3D）TiO2nanomaterials with different morphologies and optical properties are successfully synthesized at the liquid interface of cyclohexane and water through changing the temperature parameter of solvothermal.The results show that the temperature plays a significant role on the morphology of the 3DTiO2 nanomaterials.When the temperature is at 60℃,the one-dimensional（1D）nanorods just assemble into 3Dspherical structure;as the temperature increases to 90℃and 120℃,the morphology of 3DTiO2 nanomaterials changes obviously,the spherical structure changes into flower-like ones.With the temperature increasing to 150℃,perfect sea-urchin like 3DTiO2 nanomaterials can be obtained.Owning to the different morphologies and sizes of the samples,the absorption capacity and special surface area of 3DTiO2 exhibit big difference,which could effect the overall photoelectric conversion efficiency of DSSC in turn,the photoelectric conversion efficiency of DSSC is biggest that used the 3Dsea-urchin like TiO2 nanomaterial as anode.