石墨烯是sp^2杂化碳质材料的基本结构单元,为构筑具有特定结构和功能的碳质材料带来新的契机.通过石墨烯/氧化石墨烯的液相组装和组装体织构的二次调控可以实现新颖碳功能材料的可控制备,这种液相制备方法实现了碳结构单元在溶液相直接自组装构建固相碳质材料.相比较而言,碳功能材料制备的经典方法,如固相炭化方法侧重干材料宏观尺度的结构和形态调控(如炭纤维),气相沉积方法长于在微观层面实现材料结构控制(如碳纳米管);而这种基于石墨烯自组装的液相制备方法架起了从微观到宏观的桥梁,实现了材料介观织构的精确构建.结合本课题组近年来的研究工作,本文对与石墨烯相关的液相结构组装和组装体织构调控方面的研究进展进行了简要评述和前景展望,并着重介绍了几种新颖的石墨烯基多孔碳功能材料.
Graphene is a basic unit for various types of sp^2 carbon forms and its emergence brings new opportunities to construct carbonaceous materials with desired structure and function. Controlled preparation of novel carbonaceous functionalized materials can be achieved by graphene/graphene oxide assembly in solution and texture tuning. That is, solid carbon materials can be directly constructed from graphene sheets in liquid by solution-processing methods. Conventional carbonization of solids focuses on tuning macroscale morphology (e.g., carbon fiber), while vapor deposition to prepare nanocarbons allows structural control at the microscale (e.g., carbon nanotubes). In comparison, solution-processing methods to construct graphene macroassemblies bridge between micro- and macrosystems, so have the evident advantage of mesoscale texture control of final materials. Combined with our recent work, this review summarizes the development of solution-processed assemblies and texture tuning of graphene-based macroforms with emphasis on several novel graphene-based porous materials, and is concluded by discussing the prospects of this field.