Abstract
Large-scale production of graphene and subsequent sample engineering is the key for fully-realizing the potential applications proposed to this intriguing two-dimensional nanomaterial. Herein, smart graphene dispersions with low defects and thermo-responsive properties can be obtained by liquid phase exfoliation of graphite using an alkylated Percec monodendron (3,4,5-trioctadecyloxybenzaldehyde, 1) as the stabilizing reagent. By simply changing the temperature, the dispersed graphene and 1 can be detached, leading to the recovery of both components. Besides noncovalent wrapping, the stabilizing reagent 1 can be also covalently attached to graphene through [3+2] cycloaddition. The covalently functionalized graphene sheets show improved dispersibility in organic solvents compared to the pristine graphene, which opens the door for their applications in various polymer matrixes. The strategy demonstrated here provides a new methodology to get smart graphene dispersions with multiple functions.
摘要
石墨烯的宏量制备及其后续处理工艺对全面实现这一有趣二维纳米材料的潜在应用起着至关重要的作用. 在此, 我们采用一种烷基 枝化的Percec型枝化分子(3,4,5-三十八烷基苯基醚-1-甲醛, 1)作为稳定剂, 利用液相剥离石墨粉的方法, 制备了具有低缺陷、热响应性能的 智能石墨烯分散液. 通过简单地改变温度, 便能实现处于分散状态的石墨烯与稳定剂1的分离和回收利用. 除了上述非共价缠绕, 稳定剂1 也能够通过[3+2]环加成反应共价修饰于石墨烯表面. 修饰后的石墨烯在多种有机溶剂中表现出比未修饰石墨烯更好的分散性, 从而为进 一步将其引入聚合物体系创造了条件. 本文所示的方法提供了一种制备智能石墨烯分散液以满足多种应用的新思路.
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Acknowledgments
This work was supported by the Hundred Talents ProgramofChineseAcademy of Sciences (Y20245YBR1) and theNational Natural Science Foundation of China (21402215 and 61474124). Prof. Wang thanks the financial support from Shandong Province Higher Education Science and Technology Program (J16LA01).
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Keyang Yin was born in 1990. He obtained his BSc degree in chemistry education from Qilu Normal University in 2014, and he is currently aMaster candidate at Liaocheng University. His research interestsmainly focus on functional graphene, oil-soluble carbon quantum dots and their applications for energy-related devices.
Liping Wang was born in 1975. She obtained her BSc degree and PhD degree from Qufu Normal University in 1998 and Northwest Normal University in 2007 respectively. After two-year’s postdoctoral research at Shandong University, she joined LiaochengUniversity. Her research interestmainly lies in “living” polymerization and honeycomb-patterned porous films.
Hongguang Li was born in 1979. He obtained his BSc degree and PhD degree fromShandong University in 2003 and 2008, respectively. After three-year’s postdoctoral research, he joined the Laboratory of Clean Energy Chemistry and Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences as a full-time professor. His current interest lies in the design of novel π-conjugated molecules and engineering carbon nanomaterials for applications in optoelectronic devices.
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Yin, K., Liu, Q., Wang, L. et al. Thermo-responsive graphene dispersions by liquid phase exfoliation of graphite aided by an alkylated Percec monodendron. Sci. China Mater. 60, 343–351 (2017). https://doi.org/10.1007/s40843-016-9011-1
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DOI: https://doi.org/10.1007/s40843-016-9011-1