热膨胀剥离法制备石墨烯及其表征  

Preparation and Characterization of Graphene by Thermal Exfoliation

作　　者：刘晓文[1] 黄雪梅[1] 华燕莉[1] 赵皇[1] 高海青[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《非金属矿》2013年第2期23-25,共3页Non-Metallic Mines

摘　　要：以-48um高纯鳞片石墨为原料，先采用Hummers法制备氧化石墨，再采用高温热膨胀剥离法制备石墨烯。利用x射线衍射（XRD）、傅里叶红外光谱（FT-1R）、原子力显微镜（AFM）、M吸附-脱附（BET）等研究了氧化石墨及石墨烯的晶体结构、表面官能团、表面形貌、比表面积、孔径分布等。XRD研究结果表明，氧化石墨层间距为0．94nnl，原有的石墨峰消失；热膨胀所得石墨烯（20=25．6°，d（002）=0．348nm）为无定形态。FT-IR分析表明，石墨氧化过程中结构层间形成大量含氧官能团，经高温还原后仅残存部分含氧官能团。石墨烯具有较高的比表面积（336．7m2／g），其厚度在0．4～0．7nm之间，为1～2层石墨烯。The -48 μm flake graphite was used as raw materials, first of all, graphite oxide was prepared by Hummers method, and graphene was prepared through thermal exfoliation of graphite oxide. The phases, structures and morphologies of graphite oxide and graphene were characterized by X-ray diffraction （XRD）, fourier transform infra-red （FT-IR）, atomic force microscopy （AFM）, hrunauer-emmett-tellerb（BET）. Graphite oxide of XRD showed that graphite oxide had a layered structure with a basal spacing of 0.94 nm, the characteristic iffraction peaks of graphite disappeared. The graphene sheets showed a broad （002） diffraction peak at about 20=-25.6°, the d（002） value being 0.348 tun and broadening of this reflection were typical for randomly ordered graphitic platelets. FT-IR spectra showed that the graphite was oxidized to covalent bond-type graphite intercalation compounds with various oxygen bearing functional groups. And the bulk of the oxygen-containing functional groups were removed from graphene oxide after thermal expansion. Surface area measurement of graphene sheets via nitrogen gas absorption yielded a high-BET value of 336.7 m2/g. The thickness of graphene measured from the height profile of the AFM image was 0.4 -0.7 ran, and layers were 1-2.

关 键 词：石墨烯 氧化石墨 Hummers法 热膨胀剥离法 

分 类 号：TQ127.1[化学工程—无机化工]