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基于Hummer化学氧化法,以不同纯度的石墨为原料,在氧化阶段改变氧化剂(KMnO4)的添加速率,研究了氧化石墨的制备及其结构形成。结果表明:石墨原料纯度及氧化剂添加速率对氧化石墨结构有重要影响。以高纯度石墨为原料,在合适的添加速率下制备出的氧化石墨具有高的结晶性和纯度。扫描电镜观察制得的氧化石墨呈片层结构,厚约50nm。X射线分析显示对称氧化石墨(002)强衍射峰,无残留石墨峰和其它杂质峰。红外光谱分析氧化石墨含—OH,C=O,C—O等含氧基团。Ar气氛下对氧化石墨进行热解,产物为石墨烯。将制得的氧化石墨引入聚硅氧烷中,经交联和热解制出具有层状复合结构呈一定取向分布的石墨烯和硅氧碳陶瓷复合材料。
Based on the Hummer chemical oxidation method, graphite with different purity was used as raw material to change the addition rate of oxidant (KMnO4) in oxidation stage. The preparation and structure of graphite oxide were studied. The results show that the purity of graphite raw material and the addition rate of oxidant have an important influence on the structure of graphite oxide. With high purity graphite as raw material, graphite oxide prepared under suitable addition rate has high crystallinity and purity. Scanning electron microscopy of graphite oxide obtained sheet structure, thickness of about 50nm. X-ray analysis showed strong diffraction peaks of symmetrical graphite oxide (002), no residual graphite peaks and other impurity peaks. Infrared spectroscopy Graphite oxide containing -OH, C = O, C-O and other oxygen-containing groups. Graphite was pyrolyzed under Ar atmosphere. The product was graphene. The obtained graphite oxide is introduced into the polysiloxane, and the graphene and the silicon oxycarbon ceramic composite material with the layered composite structure arranged in a certain orientation is prepared through the crosslinking and pyrolysis.