Transformation of Organic-Inorganic Hybrid Films Obtained by Molecular Layer Deposition to Photocatalytic Layers with Enhanced Activity
Transformation of Organic-Inorganic Hybrid Films Obtained by Molecular Layer Deposition to Photocatalytic Layers with Enhanced Activity
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DOI：
10.1021/nn302370y
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发表时间：
2012-08-01
期刊：
影响因子：
17.1
通讯作者：
Yerushalmi, Roie
中科院分区：
文献类型：
--
作者：
Ishchuk, Sergey;Taffa, Dereje Hailu;Yerushalmi, Roie
我们展示了使用无溶剂 MID 将 TiCl4 作为金属前体和乙二醇 (EG) 形成的有机无机杂化钛硅酮薄膜转化为高活性光催化薄膜。使用羟基官能化卟啉作为光谱标记物研究了薄膜的光催化活性。采用 TEM 成像和电子衍射、XPS、紫外可见光谱和光谱椭圆光度法对薄膜进行结构和成分分析。研究了不同退火温度下 Ti-EG 薄膜的光催化活性，并与使用 TiCl4 作为金属前驱体和 H2O 通过 AID 制备的 TiO2 薄膜（TiO2 薄膜）进行比较。总体而言，我们的结果表明，在最佳工艺条件下，热退火 Ti-EG 薄膜的光催化活性比 AID 制备的 TiO2 薄膜的光催化活性提高了约 5 倍。综合结果表明，结构和光催化性能可分为三种状态：（I）无定形状态，中间染料负载量，低光催化活性，具有结晶和非晶区域的OH中间膜状态，高染料负载量，高催化活性，以及（III）高度结晶膜，低染料负载量和低光催化活性。光催化纳米管（NT）的形成通过使用牺牲Ge纳米线（NW）支架来产生具有可控壁厚结构和增强的染料负载能力的Ti-EG NT结构来证明。我们的结果证明了 MLD 形成具有高光催化活性的金属氧化物的可行性和巨大潜力。
We present the transformation of organic inorganic hybrid titanicone films formed by TiCl4 as metal precursor and ethylene glycol (EG) using solvent-free MID to highly active photocatalytic films. The photocatalytic activities of the films were investigated using hydroxyl-functionalized porphyrin as a spectroscopic marker. TEM imaging and electron diffraction, XPS, UV-vis spectroscopy, and spectroscsopic ellipsometry were employed for structural and composition analyses of the films. The photocatalytic activity of Ti-EG films was investigated for different anneal temperatures and compared to TiO2 films prepared by AID using TiCl4 as metal precursor and H2O (TiO2 films). Overall, our results indicate that the photocatalytic activity of the thermally annealed Ti-EG film is about 5-fold Increased compared to that of the TiO2 film prepared by AID for optimal process conditions. The combined results indicate that the structural and photocatalytic properties can be assigned to three states: (I) amorphous state, intermediate dye loading, low photocatalytic activity, OH intermediate film state with both crystalline and amorphous regions, high dye loading, high catalytic activity, and (III) highly crystalline film with low dye loading and low photocatalytic activity. The formation of photocatalytic nanotubes (NTs) is demonstrated using sacrificial Ge nanowires (NWs) scaffolds to yield Ti-EG NT structures with controllable wall thickness structures and enhanced dye loading capacity. Our results demonstrate the feasibility and high potential of MLD to form metal oxides with high photocatalytic activity.