School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, People's Republic of China.
Nanotechnology. 2013 Mar 22;24(11):115603. doi: 10.1088/0957-4484/24/11/115603. Epub 2013 Feb 28.
With a unique structure and extraordinary properties, graphene has attracted tremendous attention in the preparation of graphene-based composites for various applications. In this study, two different strategies, including in situ growth and a self-assembly approach, have been developed to load CeO2 nanoparticles onto reduced graphene oxide (RGO) nanosheets. The microstructure and morphology of the as-synthesized RGO/CeO2 nanocomposites were investigated by x-ray diffraction, Raman spectroscopy and transmission electron microscopy. The results reveal that CeO2 nanoparticles with well-controlled size and a uniform distribution on RGO sheets with tunable density can be achieved through the self-assembly approach. The significantly enhanced photocatalytic activity of the RGO/CeO2 nanocomposites in comparison with bare CeO2 nanoparticles was revealed by the degradation of methylene blue under simulated sunlight irradiation, which can be attributed to the improved separation of electron-hole pairs and enhanced adsorption performance due to the presence of RGO. A suitable loading content of CeO2 on RGO was found to be crucial for optimizing the photocatalytic activity of the nanocomposites. It is expected that this convenient assembly approach with high controllability can be extended to the attachment of other functional nanoparticles to RGO sheets, and the resultant RGO-supported highly dispersed nanoparticles are attractive for catalysis, sensing and power source applications.
具有独特结构和非凡性能的石墨烯在制备用于各种应用的基于石墨烯的复合材料方面引起了极大的关注。在这项研究中，开发了两种不同的策略，包括原位生长和自组装方法，将 CeO2 纳米颗粒负载到还原氧化石墨烯（RGO）纳米片上。通过 X 射线衍射、拉曼光谱和透射电子显微镜研究了所合成的 RGO/CeO2 纳米复合材料的微观结构和形貌。结果表明，通过自组装方法可以实现 CeO2 纳米颗粒的尺寸可控且均匀分布在 RGO 片上，并且 RGO 片上的密度可调。在模拟太阳光照射下，通过亚甲基蓝的降解，揭示了 RGO/CeO2 纳米复合材料比纯 CeO2 纳米颗粒具有显著增强的光催化活性，这归因于 RGO 的存在提高了电子空穴对的分离效率和增强了吸附性能。发现 RGO 上 CeO2 的合适负载量对于优化纳米复合材料的光催化活性至关重要。预计这种具有高可控性的简便组装方法可以扩展到将其他功能纳米颗粒附着到 RGO 片上，并且所得的 RGO 负载的高分散纳米颗粒在催化、传感和电源应用方面具有吸引力。
