nCeO_(2)/Au复合材料的制备及其光电性能研究

Preparation and optoelectronic properties of nCeO_(2)/Au composites

以硝酸铈铵为铈源,通过水热法合成了高度分散的氧化铈纳米颗粒(nCeO_(2))。利用沉淀沉积法将金与nCeO_(2)复合,得到小尺寸的纳米氧化铈/金(nCeO_(2)/Au)复合材料。通过X射线衍射仪、透射电子显微镜和X射线光电子能谱仪对nCeO_(2)以及nCeO_(2)/Au复合材料的晶体结构、形貌和化学组分进行分析。采用紫外-可见分光光度计、拉曼光谱仪及电化学工作站等多种表征方法评价样品的光电性能。结果表明,与nCeO_(2)相比,nCeO_(2)/Au复合材料具有更高的可见光吸收和转换能力,增强了氧空位形成,抑制了光生电子-空穴对的复合,促进了可见光下活性氧的产生。

Highly dispersed cerium oxide nanoparticles(nCeO_(2)) were synthesized by hydrothermal method with ammonium cerium nitrate as the cerium source.Then small-sized cerium oxide/gold nanocomposites(nCeO_(2)/Au) were prepared by precipitation deposition method.The crystal structure, morphology and chemical composition of nCeO_(2)and nCeO_(2)/Au were analyzed with X-ray diffraction analyzer, transmission electron microscope and X-ray photoelectron spectrometer.The photoelectronic properties of samples were characterized with ultraviolet spectrophotometer, Raman spectrometer and electrochemical workstation.The results showed that, compared with nCeO_(2),nCeO_(2)/Au displayed stronger adsorption and photoelectric conversion of visible light, promoted the production of active oxygen under visible light, enhanced formation of oxygen vacancies and lower recombination of photogenerated electron-hole pairs.