School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram , CET Campus, Sreekaryam, Thiruvananthapuram 695 016, India.
ACS Appl Mater Interfaces. 2017 Jun 14;9(23):19417-19426. doi: 10.1021/acsami.6b09418. Epub 2016 Oct 11.
Among several methodologies to improve the solution processing of graphene-based materials, noncovalent functionalization has been considered as the simplest and nondestructive method. Herein, we show that molecular self-assembly process can be used as a useful tool to exfoliate reduced graphene oxide (RGO), resulting in hybrid materials with improved physical properties. Upon interacting with a π-gelator, the dispersing ability of the RGO increased significantly in most of nonpolar and polar aprotic solvents when compared to the bare one. The amount of RGO dispersed was 1.7-1.8 mg mL in solvents such as toluene, o-dichlorobenzene (ODCB) and tetrahydrofuran (THF). Morphological studies revealed that aggregation of π-gelator over RGO helps to exfoliate graphene layers to remain as individual sheets with higher surface area. Experimental studies revealed enhanced surface area (250 m g) and better conductivity (3.7 S m) of the hybrid materials with 30% of RGO content resulting in excellent electrochemical performance (specific capacitance of 181 F g) as electrodes for supercapacitors.
在改善基于石墨烯的材料的溶液处理的几种方法中，非共价功能化被认为是最简单和非破坏性的方法。在此，我们表明，分子自组装过程可以用作剥离还原氧化石墨烯（RGO）的有用工具，从而产生具有改善物理性质的混合材料。与π-凝胶剂相互作用时，与裸 RGO 相比，RGO 在大多数非极性和非质子性有机溶剂中的分散能力显著提高。在诸如甲苯、邻二氯苯（ODCB）和四氢呋喃（THF）等溶剂中，RGO 的分散量为 1.7-1.8 mg mL。形态研究表明，π-凝胶剂在 RGO 上的聚集有助于剥离石墨烯层，使其保持较高表面积的单个薄片。实验研究表明，具有 30%RGO 含量的混合材料的比表面积（250 m g）和导电性（3.7 S m）得到增强，从而在超级电容器的电极中表现出优异的电化学性能（比电容为 181 F g）。
