Controlled morphologies and optical properties of ZnO films and their photocatalytic activities
Controlled morphologies and optical properties of ZnO films and their photocatalytic activities
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DOI：
10.1016/j.jallcom.2011.07.017
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发表时间：
2011-09
影响因子：
6.2
通讯作者：
Jingjing Duan;Xiaoheng Liu;Qiaofeng Han;Xin Wang
中科院分区：
文献类型：
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作者：
Jingjing Duan;Xiaoheng Liu;Qiaofeng Han;Xin Wang
在不同浓度的明胶溶液中，采用化学浴沉积法制备了六方柱状、片状和玫瑰状孪晶三种不同结构的氧化锌薄膜。讨论了氧化锌薄膜的生长机理，指出明胶作为聚电解质对薄膜微结构的形成起着至关重要的作用。研究发现，薄膜的光致发光和拉曼特性对薄膜的晶体形貌很敏感。在紫外光照射下，由六方棱柱状和玫瑰状孪晶组成的氧化锌薄膜对亚甲基蓝的光降解效率分别为95%和96%。这种优异的光催化活性可以归因于高的氧空位浓度和高比例的极性平面，这一结果对于解决高活性的来源具有重要的意义。
ZnO films with three different microstructures including hexagonal prisms, plates and rose-like twinned crystals were fabricated using chemical bath deposition with different concentration of gelatin. The growth mechanisms of ZnO films were discussed, and the gelatin played a vital role as a polyelectrolyte capping the formation of microstructures. The photoluminescence and Raman properties were found sensitive to the crystal morphologies of ZnO films. Significantly, the photodegradation efficiencies of methylene blue under UV light irradiation in the presence of ZnO films consisted of hexagonal prisms and rose-like twinned crystals were 95% and 96%, respectively. The excellent photocatalytic activities can be ascribed to the high oxygen vacancies concentration and high percentage of polar planes, and this result was important in addressing the origin of high photocatalytic activity.