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采用氧化还原法制备不同银含量的银/石墨烯纳米复合材料(银质量分数分别为0%,30%,46%,56%,63%)。并通过X射线衍射(XRD)、光电子能谱仪(XPS)、高倍透射电子显微镜(HRTEM)和拉曼光谱(Raman)分析银含量对银/石墨烯纳米复合材料形态和显微结构的影响。结果表明,氧化石墨和银离子被成功地还原成银/石墨烯纳米复合材料,所得石墨烯由3~4单层碳原子层堆砌缠绕而成,同时银纳米颗粒沉积在石墨烯的表面。银纳米颗粒的介入有效地阻碍了石墨烯的团聚,增大了石墨烯的比表面积。银纳米颗粒的尺寸与银含量相关,当银含量较低时,银纳米颗粒在石墨烯表面具有很好的分散性且粒度基本分布在25~50 nm之间,而当银含量超过46%时将会导致银纳米颗粒的团聚。另外,银纳米颗粒增强了石墨烯的拉曼效应。
Silver / graphene nanocomposites with different silver contents (0%, 30%, 46%, 56%, 63%, respectively) were prepared by redox method. The effects of silver content on the morphology and microstructure of silver / graphene nanocomposites were analyzed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), high-power transmission electron microscopy (HRTEM) and Raman spectroscopy. The results show that graphite oxide and silver ion are successfully reduced to silver / graphene nanocomposites. The obtained graphene is composed of three to four single-layer carbon atoms, and silver nanoparticles are deposited on the surface of graphene. The intercalation of silver nanoparticles effectively hinders the agglomeration of graphene and increases the specific surface area of graphene. The silver nanoparticle size is related to the silver content. When the silver content is low, the silver nanoparticles have good dispersibility on the surface of graphene and the particle size distribution is basically between 25 and 50 nm. When the silver content exceeds 46% Will result in the agglomeration of silver nanoparticles. In addition, silver nanoparticles enhance the Raman effect of graphene.