Key Laboratory of Organic Solids, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, PR China.
Sci Rep. 2012;2:662. doi: 10.1038/srep00662. Epub 2012 Sep 17.
Chemically modified graphite is an economical material with promising applications in its own right or as an intermediate in the synthesis of graphene. However, because of its extreme chemical inertness, to date only two methods-oxidation and fluorination-have been found which can modify graphite with high yield and large throughput. Herein, we describe a third chemical approach for the synthesis of large quantities of highly modified graphite which uses a microwave-sparks-assisted halogenation reaction. The resulting graphite halide can easily be exfoliated into monolayer graphene in organic solvents. The structure and electronic properties of the original graphene can be recovered after thermal annealing of the graphene halide. Furthermore, the graphene halide can be further modified by a variety of organic functional groups. Solution-processed field-effect transistors based on the graphene halides resulted in device performances were comparable to, or even better than, that of graphene oxide.
化学改性石墨是一种具有经济价值的材料，本身具有广阔的应用前景，也可作为合成石墨烯的中间体。然而，由于其极高的化学惰性，迄今为止，人们只发现了两种可以高产率、高通量地改性石墨的方法——氧化法和氟化法。在这里，我们描述了第三种用于大量合成高度改性石墨的化学方法，即使用微波火花辅助卤化反应。所得的石墨卤化物可以很容易地在有机溶剂中剥离成单层石墨烯。在对石墨烯卤化物进行热退火处理后，可以恢复原始石墨烯的结构和电子性质。此外，石墨烯卤化物可以进一步用各种有机官能团进行修饰。基于石墨烯卤化物的溶液处理场效应晶体管的器件性能可与氧化石墨烯相媲美，甚至优于氧化石墨烯。
