Abstract:

pn-Type Cu₂O-WO₃ composite semiconductor materials with different mole ratios were successfully prepared by high temperature hydrothermal method and coprecipitation method. The morphology and structure of the samples were characterized by scanning electron microscope (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The result shows that the composite is composed of cubic phase Cu₂O and hexagonal phase WO₃. In comparison with pure WO₃, the ultraviolet absorption boundary of Cu₂O-WO₃ composite semiconductor material has a significant red shift which enhanced the optical absorption under visible light, showing the good photocurrent response. The photocatalytic activities of the materials were characterized by degradation of rhodamine B (RhB) solution under visible light, and the photodegradation rate of Cu₂O-WO₃ composite with 1∶2 mole ratio reached 90.6%, while those of 22.2% and 45.2% for WO₃ and Cu₂O respectively after 8h light irradiation were obtained.

Key words: cuprous oxide, tungsten trioxide, composites, catalyst, photocatalytic reaction

摘要：

采用高温水热法和共沉淀法制备了不同摩尔比的pn型Cu₂O-WO₃复合半导体材料。并利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）和X射线衍射（XRD）对样品的形貌特征和晶格结构进行表征。表征结果显示，复合材料由立方相的Cu₂O和六方相的WO₃组成。与纯WO₃物质相比，Cu₂O-WO₃复合半导体材料的紫外吸收边界发生显著红移，在可见光波长范围内的光吸收明显增强，展示出优良的光电流响应性能。以罗丹明B（RhB）溶液的光降解表征材料的光催化性能的过程中，在可见光下光照8h后，相较于WO₃和Cu₂O仅为22.2%和45.2%的光降解率，摩尔比为1∶2的Cu₂O-WO₃复合物的降解效率达到了90.6%。

关键词: 氧化亚铜, 三氧化钨, 复合材料, 催化剂, 光催化反应