As the power density of electronic devices increases,there has been an urgent demand to develop highly conductive polymer com-posites to address the accompanying thermal management issues.Due to the ultra-high intrinsic thermal conductivity,graphene is considered a very promising filler to improve the thermal conductivity of polymers.However,graphene-based polymer composites prepared by the conventional mixing method generally have limited thermal conductivity,even under high graphene loading,due to the failure to construct efficient heat transfer pathways in the polymer matrix.Here,a spiral graphene framework(SGF)containing continuous and highly ordered graphene microtubes was developed based on a modified CVD method.After embedding into the epoxy(EP)matrix,the graphene microtubes can act as efficient heat pathways,endowing the SGF/EP composites with a high through-plane thermal conductivity of 1.35 W·m-1·K-1 at an ultralow graphene loading of 0.86 wt％.This result gives a thermal con-ductivity enhancement per 1 wt％filler loading of 710％,significantly outperforming various graphene structures as fillers.In addi-tion,we demonstrated the practical application of the SGF/EP composite as a thermal interface material for efficient thermal man-agement of the light-emitting diode(LED).

Jinrui Gong;Xue Tan;Qilong Yuan;Zhiduo Liu;Junfeng Ying;Le Lv;Qingwei Yan;Wubo Chu;Chen Xue;Jinhong Yu;Kazuhito Nishimura;Nan Jiang;Cheng-Te Lin;Wen Dai

Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materials and Protective Technologies,Ningbo Institute of Materials Technology and Engineering(NIMTE),Chinese Academy of Sciences,Ningbo,Zhejiang 315201,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Centre for Quantum Physics,Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE);Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systems,School of Physics,Beijing Institute of Technology,Beijing 100081,China;College of Materials Science and Engineering,Hunan University,Changsha,Hunan 410082,China;Advanced Nano-processing Engineering Lab,Mechanical Systems Engineering,Kogakuin University,Tokyo 192-0015,Japan

中国化学（英文版）

[1]Jinrui Gong;Xue Tan;Qilong Yuan;Zhiduo Liu;Junfeng Ying;Le Lv;Qingwei Yan;Wubo Chu;Chen Xue;Jinhong Yu;Kazuhito Nishimura;Nan Jiang;Cheng-Te Lin;Wen Dai-.A Spiral Graphene Framework Containing Highly Ordered Graphene Microtubes for Polymer Composites with Superior Through-Plane Thermal Conductivity)[J].中国化学（英文版）,2022(03):329-336

Microtubes

Spiral,Graphene,Framework,Containing,Highly,Ordered,Polymer,Composites,Superior,Through,Plane,Thermal,Conductivity,power,density,electronic,devices,increases,there,has,been,urgent,demand,highly,conductive,address,accompanying,thermal,management,issues,Due,intrinsic,conductivity,graphene,considered,very,promising,improve,polymers,However,composites,prepared,by,conventional,mixing,method,generally,have,limited,even,under,loading,due,failure,construct,efficient,heat,transfer,pathways,matrix,Here,spiral,framework,SGF,containing,continuous,ordered,microtubes,was,developed,modified,CVD,After,embedding,into,epoxy,EP,endowing,through,plane,ultralow,wt,This,result,gives,enhancement,significantly,outperforming,various,structures,fillers,In,addi,demonstrated,practical,application,interface,material,light,emitting,diode,LED

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