Rutile TiO₂ nanoparticles were synthesized using the colloidal sol-gel process and their photocatalytic properties were characterized in comparison with anatase TiO₂ nanoparticles. The synthesized rutile nanoparticles were found to possess higher surfaces area than the anatase nanoparticles and to exhibit lower photocatalytic activities, demonstrating that rutile TiO₂ has intrinsically low photocatalytic properties. The photoluminescence (PL) study suggested that the inferior photocatalytic activity of rutile nanoparticles is correlated with the intrinsic recombination of photogenerated electron-hole pairs.

中文翻译：

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金红石型TiO的低光催化活性的起源2

采用胶体溶胶-凝胶法合成了金红石型TiO ₂纳米粒子，并与锐钛矿型TiO ₂纳米粒子相比，表征了其光催化性能。发现合成的金红石纳米粒子比锐钛矿纳米粒子具有更高的表面积并且表现出较低的光催化活性，表明金红石TiO ₂本质上具有低的光催化性能。光致发光（PL）研究表明，金红石型纳米粒子的劣质光催化活性与光生电子-空穴对的固有重组相关。