控制液相结晶单体以合成高光催化活性混合相一维二氧化钛奈米柱.pdf

控制液相結晶單體以合成高光催化活性混 合相一維二氧化鈦奈米柱陣列之研究 Synthesis of High Photocatalytic Activity Mixed Phase 1D TiO2 Nanorod Arrays by Controlling the Solution-Based Nucleation Monomers 1 2 L.C. Kao, Y.H. Liu One-dimensional ( 1D) titanium dioxide (TiO ) 2 has exten sive technological application s b ecau se of it s ch emical stab ility, gen er al r eactivity, high photocatalytic activity, and nontoxicity. Heterogeneous ph ot ocat aly st s wer e sh own t o b e m or e effective than either pure anatase or rutile phase TiO2 . The enhanced performance of the mixed phase TiO2 was attributed to the spatial charge separation and hindered recombination across the phase interfaces. The mixed phase 1D TiO2 nanorods were suspended in solution and obtained by centrifugation and sintering, thus it was difficult to preserve as a large-scale nanorod array film. In this research, a large-scale, transparent, and free-standing film of 1-D rutile/anatase TiO2 nanorod arrays was fabricated by dynamically changing the acidity and concentrations of titanium and chloride ions. Oriented attachment, pre-nucleation clusters of ions or of primary particles was introduced to form hybrid organic– inorganic interfaces in a solvent- based environment . We u sed a synchrotron-based X -r ay sp ectr oscopy to stu dy th e inter face of th e mixed structures that revealed the growth–induced defects. These TiO2