Effect of cerium doping on the optical and photocatalytic properties of ZnO nanoflowers

[摘要] Photocatalytic performances of the synthesized cerium doped (Ce-doped) ZnO nanoflowers are reported in this work. A microwave-assisted sol–gel method is adopted for the synthesis of the nanomaterial and its structural andmorphological features are characterized. While doping, the Ce$^{3+}$ ions occupy the sites of Zn$^{2+}$ ions in the hexagonal ZnO lattice, which is investigated by means of X-ray diffraction studies and energy dispersive X-ray analysis. At higher Ce$^{3+}$ concentrations, ultraviolet (UV) light absorption is quite high as evidenced by the UV–Vis absorption spectra. The photoluminescence study demonstrates higher oxygen vacancy and zinc interstitials for the Ce-doped ZnO compared to the undoped ZnO. Ce-doping improves the electrical properties of the sample as well. Finally, it is established that the Ce-doped ZnO nanoflower is highly efficient in UV degrading the methylene blue organic dye.

[学科分类] 材料工程

[关键词] Semiconductor;nanoflowers;photoluminescence;defects;microwave-assisted sol–gel method.