氧化石墨烯自组装水凝胶

Graphene Oxide Self-assembled Hydrogels

氧化石墨烯(GO)是化学氧化-还原法制备石墨烯的中间体,也是除石墨烯以外最为重要的二维纳米材料.由于GO纳米片表面富含各种含氧基团,因此其在水溶液中可以与多种物质发生超分子自组装,形成水凝胶.本文在分析GO化学结构的基础上,总结GO水凝胶的制备方法和形成机理,着重讨论GO的拓扑形状对水凝胶形成的影响,以及促进GO形成凝胶的超分子作用力,包括氢键、静电作用、配位作用、π-π作用等.最后,对GO自组装水凝胶的应用进行了评述,并展望了该领域今后的发展方向.

Graphene oxide （GO） is the precursor of chemically converted graphene,and also a very important two-dimensional nano- material. Owing to the various oxygen-containing functional groups on GO sheets, GO can form supramolecular hydrogels via three dimensional self-assembly with diverse substances. In this review, after elucidating the chemical structure of GO, we reviewed the preparation methods and formation mechanism of GO hydrogels. The effects of two-dimensional shape of GO,and the supramoleeular interactions which were commonly used to crosslink GO hydrogels, including hydrogen bond, electrostatic interaction, coordination and π-π interaction, were discussed comprehensively. Finally, the applications of graphene hydrogels were summarized, and future prospect in this area was also described.