Ag–ZnO thin films were prepared by a two-step method and then annealed in a vacuum atmosphere at different temperature. It could be seen from the scanning electron microscopy images that the ZnO nanorods collapsed rapidly for the sample annealed at 400 °C (Ag–ZnO-400) and the average diameter of Ag nanoparticles increases with the increasing of annealing temperature. Compared to Ag–ZnO, the Ag–ZnO-400 presents the higher surface plasmon resonance absorbance peak, which was attributed to the increasing of the average diameter of silver nanoparticles. The transient photocurrent curves exhibited that the photocurrent density of Ag–ZnO-400 (~ 0.165 mA/cm −2 ) was twenty time larger than that of the Ag–ZnO (~ 0.008 mA/cm −2 ). The photocatalytic degradation efficiency of Ag–ZnO-400 catalysts for the methyl orange in aqueous solutions is over 63%.

中文翻译：

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真空退火对Ag纳米颗粒修饰ZnO薄膜太阳光响应和光催化性能的影响

Ag-ZnO薄膜采用两步法制备，然后在真空气氛中不同温度下退火。从扫描电子显微镜图像可以看出，在 400 °C 退火的样品（Ag-ZnO-400）中，ZnO 纳米棒迅速坍塌，Ag 纳米颗粒的平均直径随着退火温度的升高而增加。与 Ag-ZnO 相比，Ag-ZnO-400 呈现出更高的表面等离子体共振吸收峰，这归因于银纳米粒子平均直径的增加。瞬态光电流曲线表明，Ag-ZnO-400 的光电流密度（~ 0.165 mA/cm -2 ）比 Ag-ZnO 的光电流密度（~ 0.008 mA/cm -2 ）大二十倍。Ag-ZnO-400催化剂对水溶液中甲基橙的光催化降解效率超过63%。