Substrate-Assisted Crystallization and Photocatalytic Properties of Mesoporous TiO2 Thin Films
Substrate-Assisted Crystallization and Photocatalytic Properties of Mesoporous TiO2 Thin Films
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DOI：
10.1021/cm060450b
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发表时间：
2006-05
影响因子：
8.6
通讯作者：
Yu Zhang;Jun Li;John Wang
中科院分区：
文献类型：
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作者：
Yu Zhang;Jun Li;John Wang
采用衬底辅助法制备了晶化程度较高、光催化活性增强的介孔二氧化钛薄膜。利用小角X射线散射仪、透射电子显微镜、X射线衍射仪、拉曼光谱仪和紫外可见光谱仪研究了非晶玻璃、多晶铂和单晶硅三种衬底对二氧化钛薄膜结构的影响。当衬底从非晶态玻璃转变为多晶铂，再转变为单晶硅(111)时，孔道结构发生了从立方结构到笼状阵列的转变，并伴随着纳米结晶度的增加。所观察到的介孔二氧化钛孔结构的转变可以用所涉及的底物体系之间的成核行为和表面能的差异来解释。纳米晶度增强的介孔二氧化钛薄膜表现出更好的光催化活性。
Highly crystallized mesoporous TiO2 thin films with enhanced photocatalytic activity were synthesized via a substrate-assisted strategy. Three types of substrates, namely, amorphous glass, polycrystalline Pt, and single-crystal Si(111) wafer, were employed to study their effects on the structure of TiO2 films, by using small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), X-ray diffraction (XRD), a Raman spectrometer, and a UV−vis spectrophotometer. When the substrate was changed from amorphous glass to polycrystalline Pt and then to single-crystal Si(111), a transition in the pore configuration took place from a cubical configuration to cagelike arrays, accompanied by an increase in nanocrystallinity. The observed transitions in pore configuration of mesoporous TiO2 can be accounted for by the differences in nucleation behaviors and surface energy among the substrate systems involved. Mesoporous TiO2 thin films of enhanced nanocrystallinity demonstrate improved photocatalytic activ...