Noncovalent functionalization of graphene with end-functional polymers
Noncovalent functionalization of graphene with end-functional polymers
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DOI：
10.1039/b919074k
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发表时间：
2010-01-01
影响因子：
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通讯作者：
Kim, Sang Ouk
中科院分区：
文献类型：
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作者：
Choi, Eun-Young;Han, Tae Hee;Kim, Sang Ouk
还原石墨烯在各种有机溶剂中的稳定分散是通过与胺封端的聚合物的非共价官能化实现的。通过在水性介质中化学还原氧化石墨烯来制备还原的石墨烯的水性分散体，并真空过滤以产生还原的石墨烯片。使用溶解度测试评估干燥的还原石墨烯的良溶剂和非溶剂。为了实现在所评估的非溶剂中的稳定分散，将胺封端的聚苯乙烯非共价官能化到石墨烯，而石墨烯片通过超声处理从水相相转移到有机非溶剂相，包括胺封端的聚合物。通过FTIR和拉曼光谱研究证实，聚苯乙烯的质子化氨基末端基团与石墨烯表面的羧酸基团发生了非共价功能化，从而在各种有机介质中提供了高的介电常数。
Stable dispersion of reduced graphene in various organic solvents was achieved via noncovalent functionalization with amine-terminated polymers. An aqueous dispersion of reduced graphene was prepared by chemical reduction of graphene oxide in aqueous media and was vacuum filtered to generate reduced graphene sheets. Good solvents and nonsolvents for the dried reduced graphene were evaluated using a solubility test. To achieve stable dispersion in the evaluated nonsolvents, amineterminated polystyrene was noncovalently functionalized to the graphene, while graphene sheets were phase transferred via sonication from aqueous phase to the organic nonsolvent phase, including the amine-terminated polymers. Thorough FTIR and Raman spectroscopy investigation verified that the protonated amine terminal group of polystyrene underwent noncovalent functionalization to the carboxylate groups at the graphene surface, providing the high dispersibility in various organic media.