我们利用微机械剥离方法制备了三层石墨烯。在此基础上, 利用两室气体传输法, 以三氯化铁和钾为化学掺杂剂, 成功合成了三层石墨烯的一阶p型和n型插层化合物。三层石墨烯的高分辨率拉曼光谱具有独特的2D谱峰线形, 该线形可以用作指纹来鉴别三层石墨烯。三层石墨烯一阶插层化合物的拉曼光谱表明, 三氯化铁和钾的插层掺杂使得三层石墨烯的层间耦合作用严重减弱, 掺杂剂层之间的每一层石墨烯都具有重掺杂单层石墨烯的物理性质。具有纳米级厚度的多层石墨烯插层化合物的成功制备将为石墨烯在重掺杂情况下的基础物理研究和石墨烯的微纳光电子器件研究打下良好基础。

We prepared trilayer graphene by the means of micromechanical cleavage. Trilayer graphene were intercalated into stage-1anhydrous ferric chloride (FeCl3) and potassium (K) intercalation compounds using a two-zone vapour transport method. The 2D band of trilayer graphenes has a distinct lineshape, which can be used as a fingerprint for characterizing trilayer graphenes. The Raman spectra of stage-1trilayer graphene intercalation compounds indicate that each graphene layer between intercalant layers behaves as a decoupled heavily doped monolayer graphene. The multilayer graphene intercalation compounds with nano-scale thickness have great potential for investigations of fundamental physics and for their applications in electronics and photonics.