Characterization, uniformity and photo-catalytic properties of graphene/TiO2 nanocomposites via Raman mapping.
Characterization, uniformity and photo-catalytic properties of graphene/TiO2 nanocomposites via Raman mapping.
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DOI：
10.1364/oe.25.021496
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发表时间：
2017-09
期刊：
影响因子：
3.8
通讯作者：
Xinyu Wang;Jie Zhang;Xiao-lei Zhang;Yong Zhu
中科院分区：
文献类型：
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作者：
Xinyu Wang;Jie Zhang;Xiao-lei Zhang;Yong Zhu
通过简单的溶胶-凝胶自组装方法和额外的热退火工艺相结合，开发了三种类型的锐钛矿型TiO2、石墨烯-TiO2、TiO2-石墨烯复合材料（G/TiO2）。它们的结构和性质通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线衍射（XRD）、原子力显微镜（AFM）和拉曼光谱分析来确定。此外，还分析了TiO2和石墨烯的拉曼光谱、G带和二维带的能带位移和强度，以验证TiO2和石墨烯之间的相互耦合。结合拉曼图谱和AFM分析，定量分析了TiO2纳米颗粒的团聚效应。最后，通过拉曼图测量对三种复合材料的光催化性能进行了实验研究。结果表明，具有高电子迁移率的石墨烯通过界面相互作用作为受体，被证明可以增强 TiO2 的光催化效果。
Three types of anatase TiO2, graphene-TiO2, TiO2-graphene composites (G/TiO2) were developed, synthesized via a combination of simple sol-gel self-assembly method and additional thermal annealing process. Their structures and properties are determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), atomic force microscopy (AFM) and Raman spectrum analysis. In addition, Raman spectra of TiO2 and graphene, the band shift and intensity of G and 2D band were analyzed, in order to verify the mutual coupling between TiO2 and graphene. Combined Raman mapping with AFM analysis, the agglomeration effect of TiO2 nanoparticles was figured out by quantitative analysis. Finally, the photo-catalytic properties of three kinds of composites were experimentally studied via Raman mapping measurements. The results reveal that graphene with high electron mobility, as an acceptor through interfacial interactions, was certificated to enhance the photo-catalytic effect of TiO2.