Hyperstage Graphite: Electrochemical Synthesis and Spontaneous Reactive Exfoliation.
Hyperstage Graphite: Electrochemical Synthesis and Spontaneous Reactive Exfoliation.
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DOI：
10.1002/adma.201704538
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发表时间：
2018-01
期刊：
影响因子：
--
通讯作者：
Swager TM
中科院分区：
文献类型：
--
作者：
Jeon I;Yoon B;He M;Swager TM
石墨烯的π电子基面的共价改性使得能够形成具有增强功能的新材料。报道了一种用于形成所谓的Hyperstage-1石墨层间化合物（GIC）的电化学方法，其具有非常大的层间距d 001> 15.3 μ m并且含有无序的间隙分子/离子。这种材料是高度活化的，并且当与重氮离子反应时经历自发剥离，以产生具有每12个石墨烯碳一个侧芳环的高官能化密度的可溶性石墨烯。实现高官能化密度的关键是Hyperstage-1GIC状态、相邻石墨烯层之间的货车德瓦尔斯耦合的减弱以及反应物扩散到层之间的无序插层相中的能力。用3，5-二硝基苯基官能化的石墨烯在N，N-二甲基甲酰胺中提供了优异的溶解度（0.24 mg mL−1）并与胺缀合。
Covalent modification of the π-electron basal planes of graphene enables the formation of new materials with enhanced functionality. An electrochemical method is reported for the formation of what is referred to as a Hyperstage-1 graphite intercalation compound (GIC), which has a very large interlayer spacing d001 > 15.3 Å and contains disordered interstitial molecules/ions. This material is highly activated and undergoes spontaneous exfoliation when reacted with diazonium ions to produce soluble graphenes with high functionalization densities of one pendant aromatic ring for every 12 graphene carbons. Critical to achieving high functionalization density is the Hyperstage-1 GIC state, a weakening of the van der Waals coupling between adjacent graphene layers, and the ability of reactants to diffuse into the disordered intercalate phase between the layers. Graphene functionalization with 3,5-dinitrophenyl groups provides for exceptional dispersibility (0.24 mg mL−1) in N,N-dimethylformamide and for conjugation with amines.