中文摘要：

用双氧水低温氧化金属钛片的方法制备了TiO2纳米棒阵列,并以该阵列为基体,用浸渍渗透溶胶–凝胶技术制备了TiO2纳米颗粒嵌入TiO2纳米棒阵列基体的复合结构薄膜。用X射线衍射、场发射扫描电镜及光致发光光谱研究制得薄膜的结构和发光性能。结果表明：纳米棒阵列为金红石与锐钛矿的混晶结构,而溶胶–凝胶获得的TiO2为纯锐钛矿结构。在复合构造薄膜中TiO2纳米颗粒嵌入到纳米棒阵列间隙中,其光生电子–空穴对的空间分离效果得到明显改善。用制得的薄膜进行光催化降解水中若丹明B的实验结果显示：复合结构薄膜的光催化效率高于相应的纳米棒阵列,其表观反应常数是相同质量的溶胶–凝胶法制备薄膜的3倍,这是因为第二相TiO2纳米颗粒嵌入TiO2纳米棒阵列中促进了光生电子–空穴对的空间分离,从而提高了复合结构薄膜的光催化活性。

英文摘要：

Titania nanorod film was synthesized by direct oxidation of metallic Ti with hydrogen peroxide solution under a low temperature. Titania nanoparticles were then filled into the gaps among the nanorods through an infiltration sol-gel procedure to form a composite titania film with an ordered nanostructure. The microstructure and photoluminescence property of the fabricated composite film were investigated by X-ray diffraction, field emission scanning electron microscopy and photoluminescence spectra measurement. The results show that the titania nanorod film is a mixture of anatase and futile while the sol-gel derived titania film is pure anatase. The titania nanoparticles are embedded into the titania nanorod film and thus enhance the separation of the electrons and hole pairs for the obtained composite film. The photocatalytic measurements reveal that the composite titania film exhibits improved ability to photodegrade rhodamine B in water compared with the titania nanorod film. Its apparent reaction rate constant is 3 times that obtained by the sol-gel derived titania film with the same mass. The improved photocatalytic activity for the composite titania film could be attributed to the enhanced separation of electron and hole pairs due to the embedding of the titania nanoparticles within the titania nanorods.