Self-assembled ZnO thin films with controlled sizes were successfully prepared by varying the processing parameters.The films have a photonic band gap, which extends the absorption range to the visible light region.The photocatalytic activities of the ZnO thin films were evaluated by the degradation of methyl orange (MO).The crystal structure of ZnO was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The results show that the ZnO thin films exhibit good photocatalytic activities under sunlight.Furthermore, the photocatalytic activities of the ZnO thin films were highly dependent on sphere size.With an increase in ZnO sphere size, the degradation efficiency toward MO decreased.The photodegradation can be described using a pseudo-first-order kinetics equation.%通过改变工艺参数,制得了粒径可控的ZnO自组装薄膜.该薄膜在可见光区域出现了光子带隙.以染料甲基橙的光催化降解为模型评价了ZnO自组装薄膜的光催化活性.利用X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征了ZnO的晶体结构和微观形貌.实验结果表明,ZnO自组装薄膜在太阳光照射下表现出良好的光催化性能,其光催化活性随着ZnO颗粒粒径的减小而提高.ZnO自组装薄膜光催化降解甲基橙的反应符合一级反应动力学规律.
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