Self-Exfoliation of Flake Graphite for Bioinspired Compositing with Aramid Nanofiber toward Integration of Mechanical and Thermoconductive Properties  

作　　者：Limei Huang Guang Xiao Yunjing Wang Hao Li Yahong Zhou Lei Jiang Jianfeng Wang 

机构地区：[1]College of Materials Science and Engineering,Hunan University,Changsha 410082,People’s Republic of China [2]College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082,People’s Republic of China [3]CAS Key Laboratory of Bio-Inspired Materials and Interface Sciences,Technical Institute of Physics and Chemistry Chinese,Academy of Sciences,Beijing 100190,People’s Republic of China

出　　处：《Nano-Micro Letters》2022年第10期235-247,共13页纳微快报（英文版）

基　　金：support from the National Natural Science Foundation of China(51973054);Young Talents Program in Hunan Province(2020RC3024);Natural Science Funds of Hunan Province for Distinguished Young Scholar(2021JJ10018);Science Research Project of Hunan Provincial Education Department(21B0027);High-level Innovative Talent Project in Hunan Province(2018RS3055).

摘　　要：Flexible yet highly thermoconductive materials are essential for the development of next-generation flexible electronic devices.Herein,we report a bioinspired nanostructured film with the integration of large ductility and high thermal conductivity based on self-exfoliated pristine graphene and three-dimensional aramid nanofiber network.A self-grinding strategy to directly exfoliate flake graphite into few-layer and few-defect pristine graphene is successfully developed through mutual shear friction between graphite particles,generating largely enhanced yield and productivity in comparison to normal liquid-based exfoliation strategies,such as ultrasonication,high-shear mixing and ball milling.Inspired by nacre,a new bioinspired layered structural design model containing three-dimensional nanofiber network is proposed and implemented with an interconnected aramid nanofiber network and high-loading graphene nanosheets by a developed continuous assembly strategy of sol-gel-film transformation.It is revealed that the bioinspired film not only exhibits nacre-like ductile deformation behavior by releasing the hidden length of curved aramid nanofibers,but also possesses good thermal transport ability by directionally conducting heat along pristine graphene nanosheets.

关 键 词：Graphene Aramid nanofiber Self-grinding exfoliation Bioinspired structure Functional material 

分 类 号：TB332[一般工业技术—材料科学与工程]