Molecular simulation and experimental investigation of thermal conductivity of flexible graphite film  

作　　者：Shiyu Hou Yang Liu Qingtao Yu Jikun Chen Ruitao Lv Wanci Shen Feiyu Kang Zheng-Hong Huang 

机构地区：[1]Key Laboratory of Advanced Materials of Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China [2]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083,China [3]School of Materials Science and Engineering,Beihang University,Beijing,100191,China

出　　处：《Journal of Materiomics》2024年第6期1261-1269,共9页无机材料学学报（英文）

基　　金：We would like to acknowledge the support provided by National Key R&D Program of China(2021YFC2902904).

摘　　要：Flexible graphite film(FGF),as a traditional interface heat dissipation material,has high anisotropy.It is a challenge to enhance both in-plane and through-plane thermal conductivity of FGF.For this reason,the effects of oxygen content,layer spacing,density and particle size on the in-plane and through-plane thermal conductivity of FGF were studied by both molecular simulation and experimental investigation.The simulation results indicate that the ways to improve the thermal conductivity of FGF include reducing oxygen content and layer spacing,increasing the density and matching the size of graphite sheets.The FGF prepared from room temperature exfoliated graphite(RTFGF)has a wide range of adjustable density(1.3–2.0 g/cm^(3))and thickness(50–400μm).The thermal conductivity of the RTFGF is significantly improved after heat treatment owing to reduced oxygen content and layer spacing,which is consistent with the simulation results.Moreover,RTFGF with both high in-plane(518 W·m^(-1)·K^(-1))and through-plane(7.2 W·m^(-1)·K^(-1))thermal conductivity can be obtained by particle size matching of graphite.

关 键 词：Room temperature exfoliated graphite Flexible graphite film Thermal conductivity Molecular simulation ANISOTROPY 

分 类 号：TQ127.11[化学工程—无机化工]