Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS) , Ulsan 44919, Republic of Korea.
School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea.
J Am Chem Soc. 2017 Mar 22;139(11):4202-4210. doi: 10.1021/jacs.7b00932. Epub 2017 Mar 13.
The covalent functionalization of single and bilayer graphene on SiO (300 nm)/Si was effected through sequential treatment with the alkalide reductant [K(15-crown-5)]Na and electrophilic aryl or alkyl halides, of which the iodides proved to be the most reactive. The condensation reactions proceeded at room temperature and afforded the corresponding aryl- or alkyl-appended graphenes. For each sample, Raman and X-ray photoelectron spectroscopies were used to evaluate the degrees and uniformities of functionalization. Statistical analyses of the Raman data revealed that the introduction of the organic moieties was accompanied by sp-rehybridization of the basal plane atoms. When bilayers consisting of C and C layers were treated, both the top and bottom sheets were decorated with organic groups. The reaction was followed using Raman spectroscopy, and the mechanism was studied by theoretical calculations. Indicative of its structure and reactivity, 4-pyridyl-decorated single-layer graphene was readily benzylated and appears to be an ideal platform to develop functional materials.
通过顺序处理碱性还原剂[K(15-冠-5)]Na 和亲电芳基或烷基卤化物，实现了单原子层和双层石墨烯在 SiO（300nm）/Si 上的共价功能化，其中碘化物被证明是最具反应性的。缩合反应在室温下进行，得到相应的芳基或烷基接枝石墨烯。对于每个样品，都使用拉曼和 X 射线光电子能谱来评估功能化的程度和均匀性。拉曼数据的统计分析表明，引入有机基团伴随着基底平面原子的 sp 杂化。当处理由 C 和 C 层组成的双层时，顶层和底层都被有机基团修饰。使用拉曼光谱跟踪反应，并通过理论计算研究反应机制。具有其结构和反应性的指示性，吡啶基修饰的单层石墨烯很容易苄基化，并且似乎是开发功能材料的理想平台。
