Copper-doped zinc oxide (ZnO:Cu) thin films were deposited by an ultrasonic spray pyrolysis technique on glass substrates. Doping concentration was maintained at 3 at %, and the deposition temperature was 450°C. The water content in the starting solution was varied in order to study its effect on the degradation of methylene blue (MB) dye by a photocatalytic process. X-ray diffraction patterns confirm the ZnO wurtzite structure and scanning electron microscopy analysis shows morphologies with different types of grains with average sizes varying from 90 to 300 nm. All the films achieved a maximum MB degradation of about 74% for a UV light exposition time of 180 min. However, the degradation behavior with respect to UV exposition time is different for each film. Two different degradation rates (0–90 min and 120–180 min exposure times, respectively) were performed for all ZnO films, and their photocatalytic response is related to the obtained surface morphology, which is explicated in this work. The films deposited with 80% water content in the starting solution are more promising for MB degradation when the UV exposure times are longer than 180 min.

通过超声喷雾热解技术在玻璃基板上沉积铜掺杂氧化锌 (ZnO:Cu) 薄膜。掺杂浓度保持在3at%，沉积温度为450°C。改变起始溶液中的水含量以研究其对光催化过程降解亚甲蓝 (MB) 染料的影响。X 射线衍射图证实了 ZnO 纤锌矿结构，扫描电子显微镜分析显示具有不同类型晶粒的形态，平均尺寸从 90 到 300 nm。对于 180 分钟的紫外线照射时间，所有薄膜都实现了约 74% 的最大 MB 降解。然而，每种薄膜在紫外线曝光时间方面的降解行为是不同的。两种不同的降解速率（0-90 分钟和 120-180 分钟暴露时间，分别）对所有 ZnO 薄膜进行，它们的光催化响应与获得的表面形貌有关，这在本工作中进行了解释。当紫外线照射时间超过 180 分钟时，在起始溶液中沉积的含水量为 80% 的薄膜更有可能降解 MB。