摘要
采用改进的Hummers法对不同尺寸的天然石墨进行氧化处理,水合肼还原获得石墨烯。利用红外光谱(FTIR)、拉曼光谱(Raman)、X射线衍射(XRD)等对天然石墨、氧化石墨和石墨烯的化学结构、光谱学及结晶性进行表征。结果表明:天然石墨被充分氧化为氧化石墨,氧化石墨被还原为完美的石墨烯;天然石墨尺寸越小,氧化程度越大,氧化石墨的层间距越大;氧化石墨的D峰和G峰的强度比ID/IG与天然石墨尺寸大小成正比;与同尺寸的氧化石墨相比,石墨烯的ID/IG值比氧化石墨的大,说明石墨烯中sp2杂化碳层平面的平均尺寸小于氧化石墨的平均尺寸,新生成的石墨化区域被一些缺陷分割成尺寸更小的sp2杂化区域。
The graphite oxide(GO)was prepared from natural graphite of different size with the modified Hummers method,and then the graphene was prepared by using hydrazine hydrate to reduce the exfoliated graphite oxide.The chemical structure,spectroscopy and the crystallinity of graphite,graphite oxide and graphene were characterized by using FTIR,Raman and XRD,respectively.The results show that the natural graphite is fully oxidized to graphite oxide,the graphite oxide is reduced to the perfect graphene.The smaller the size of natural graphite is,the greater the degree of oxidation,and the greater the interlayer spacing of graphite oxide are.The ratio of graphene D to G band intensities is proportional to size of graphite;compared with graphite oxide at similar size,the ratio of graphene D to G band intensities is higher than that of graphite oxide,suggesting that the average size of sp2-hybridized carbon layer surface of graphene is smaller than that of graphite oxide,and the new generation graphitization region is separated to smaller sp2-hybridized regions by some defects.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2014年第9期76-82,共7页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(50903079)
