Synthesis of reduced graphene oxide/CeO2 nanocomposites and their photocatalytic properties
Synthesis of reduced graphene oxide/CeO2 nanocomposites and their photocatalytic properties
复制标题
还原氧化石墨烯/CeO2纳米复合材料的合成及其光催化性能
DOI：
10.1088/0957-4484/24/11/115603
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发表时间：
2013-03-22
期刊：
影响因子：
3.5
通讯作者：
Chen, Kangmin
中科院分区：
文献类型：
--
作者：
Ji, Zhenyuan;Shen, Xiaoping;Chen, Kangmin
石墨烯以其独特的结构和优异的性能在制备石墨烯基复合材料方面引起了人们极大的关注。在这项研究中，两种不同的策略，包括原位生长和自组装的方法，已被开发到减少氧化石墨烯（RGO）纳米片负载CeO 2纳米粒子。采用X射线衍射、拉曼光谱和透射电子显微镜对合成的RGO/CeO 2纳米复合材料的微观结构和形貌进行了研究。结果表明，CeO 2纳米粒子具有良好的控制和RGO片的密度可调的均匀分布，可以通过自组装方法实现。在模拟太阳光照射下降解亚甲基蓝的实验结果表明，RGO/CeO 2纳米复合材料的光催化活性明显高于CeO 2纳米粒子，这可能是由于RGO的存在改善了电子-空穴对的分离和增强了吸附性能.发现在RGO上合适的CeO 2负载量对于优化纳米复合材料的光催化活性是至关重要的。可以预期，这种具有高度可控性的方便组装方法可以扩展到其他功能纳米颗粒到RGO片的附着，并且所得的RGO支撑的高度分散的纳米颗粒对于催化、传感和电源应用是有吸引力的。
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.