Brominated graphene as a versatile precursor for multifunctional grafting.
Brominated graphene as a versatile precursor for multifunctional grafting.
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溴化石墨烯作为多功能接枝的通用前体。
DOI：
10.1039/c7sc03455e
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发表时间：
2018-01-07
期刊：
影响因子：
8.4
通讯作者：
Shaffer MSP
中科院分区：
文献类型：
--
作者：
Au H;Rubio N;Shaffer MSP
使用非破坏性和通用的化学还原方法溶解并随后溴化少层石墨烯片（FLG）。溴化FLG为合成各种直接官能化的石墨烯提供了方便的前体。使用非破坏性和通用的化学还原方法溶解并随后溴化少层石墨烯片（FLG）;通过X射线光电子能谱（XPS）证明溴与石墨烯框架的直接共价连接。溴化少层石墨烯（FLG-Br）提供了一种方便、稳定的液相前体，适用于合成各种直接官能化的石墨烯。例如，FLG-Br物质用于引发原子转移自由基聚合（ATRP），以获得聚（甲基丙烯酸甲酯）（PMMA）接枝的石墨烯（FLG-PMMA），其在丙酮中的可分散性是对照的六倍。此外，FLG-Br对亲核取代反应具有活性，如甲氧基聚乙二醇（mPEG）和OH取代衍生物的制备所示。通过热重-质谱联用（TGA-MS）、XPS和拉曼光谱对产物进行了表征。这些聚合物接枝材料的接枝率（GR）在6至25%之间变化;即使在这些GR下，所有石墨烯衍生物在有机溶剂中的溶解度也有所增加。
A non-destructive and versatile chemical reduction method was used to dissolve and subsequently brominate few-layer graphene sheets (FLGs). The brominated FLGs provide a convenient precursor for the synthesis of a variety of directly functionalised graphenes. A non-destructive and versatile chemical reduction method was used to dissolve and subsequently brominate few-layer graphene sheets (FLGs); the direct covalent attachment of bromine to the graphene framework was demonstrated by X-ray photoelectron spectroscopy (XPS). The brominated few-layer graphenes (FLG-Br) provide a convenient, stable, liquid-phase precursor, suitable for the synthesis of a variety of directly functionalised graphenes. As an example, the FLG-Br species was used to initiate atom transfer radical polymerisation (ATRP), to obtain poly(methyl methacrylate) (PMMA)-grafted graphene (FLG-PMMA), which was six times more dispersible in acetone than controls. In addition, the FLG-Br is active for nucleophilic substitution reactions, as illustrated by the preparation of methoxypolyethylene glycol (mPEG)- and OH-substituted derivatives. The products were characterised by thermogravimetric analysis coupled with mass spectrometry (TGA-MS), XPS and Raman spectroscopy. Grafting ratios (GR) for these polymer-grafted materials varied between 6 and 25%; even at these GRs, all graphene derivatives showed increased solubility in organic solvents.
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