Highly Thermoconductive,Strong Graphene‑Based Composite Films by Eliminating Nanosheets Wrinkles  

作　　者：Guang Xiao Hao Li Zhizhou Yu Haoting Niu Yagang Yao 

机构地区：[1]College of Engineering and Applied Sciences,Jiangsu Key Laboratory of Artificial Functional Materials,and Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,People’s Republic of China [2]Institute of Laser Manufacturing,Henan Academy of Sciences,Zhengzhou 450052,People’s Republic of China [3]Center for Quantum Transport and Thermal Energy Science,School of Physics and Technology,Nanjing Normal University,Nanjing 210023,People’s Republic of China

出　　处：《Nano-Micro Letters》2024年第1期328-340,共13页纳微快报（英文版）

基　　金：the National Natural Science Foundation of China(No.51972162).

摘　　要：Graphene-based thermally conductive composites have been proposed as effective thermal management materials for cooling high-power electronic devices.However,when flexible graphene nanosheets are assembled into macroscopic thermally conductive composites,capillary forces induce shrinkage of graphene nanosheets to form wrinkles during solution-based spontaneous drying,which greatly reduces the thermal conductivity of the composites.Herein,graphene nanosheets/aramid nanofiber(GNS/ANF)composite films with high thermal conductivity were prepared by in-plane stretching of GNS/ANF composite hydrogel networks with hydrogen bonds andπ-πinteractions.The in-plane mechanical stretching eliminates graphene nanosheets wrinkles by suppressing inward shrinkage due to capillary forces during drying and achieves a high in-plane orientation of graphene nanosheets,thereby creating a fast in-plane heat transfer channel.The composite films(GNS/ANF-60 wt%)with eliminated graphene nanosheets wrinkles showed a significant increase in thermal conductivity(146 W m^(−1)K^(−1))and tensile strength(207 MPa).The combination of these excellent properties enables the GNS/ANF composite films to be effectively used for cooling flexible LED chips and smartphones,showing promising applications in the thermal management of high-power electronic devices.

关 键 词：GRAPHENE Aramid nanofiber Wrinkles elimination In-plane stretching Thermal conductivity 

分 类 号：TB3[一般工业技术—材料科学与工程]