石墨烯片的制备与表征  

Preparation and characterization of graphene and few-layer graphene

作　　者：冯颖[1] 黄世华[1] 康凯[1] 段晓霞[1] 

机构地区：[1]北京交通大学光电子技术研究所,北京100044

出　　处：《新型炭材料》2011年第1期26-30,共5页New Carbon Materials

基　　金：国家杰出青年科学基金(60825407);国家自然科学基金(60877025);北京市科学技术委员会专项基金(Z08000303220803);北京自然科学基金(2092024);北京交通大学基金(2007XM048)~~

摘　　要：通过微机械剥离高定向热解石墨(HOPG)法和化学气相沉积法(CVD)分别制备了不同层数的石墨烯片,并将其转移到硅片上。利用石墨烯片在不同厚度SiO2硅片上光学显微图像颜色及对比度存在的差异,对其层数进行了识别与区分。采用原子力显微镜(AFM)和拉曼(Raman)光谱判定了所制石墨烯片的层数。结果表明:所制石墨烯片有单层、少数层和多层。与双层石墨烯片的Raman谱图比较,多层石墨烯片的2D模线宽变宽,G模强度增大。此外,CVD法可生长出大面积(～cm2)的石墨烯片。Few-layer graphene was prepared from highly oriented pyrolytic graphite by micromechanical cleavage and transferred to the silicaon coated with silicon dioxide（SiO2/Si）.The thickness of graphene on the SiO2/Si support was investigated by color and contrast variations under an optical microscope.Atomic force microscopy and Raman spectroscopy were used to determine the number of layers.Results show that a monolayer,double layers and multiple layers of graphene were prepared.The optical microscope images can give a satisfactory identification of the graphene thickness on SiO2/Si.In the Raman spectrum the 2D band is narrower and G band is weaker for double layers than that for multiple layers.Chemical vapor deposition was also used to grow large area（~cm2）graphene.However,micromechanical cleavage is a more simple method to prepare graphene.

关 键 词：石墨烯 高定向热解石墨 微机械剥离法 化学气相沉积法 

分 类 号：O613.71[理学—无机化学]