Flexible mille-feuille structure electromagnetic interference shielding film with excellent thermal conductivity and Joule heating  

作　　者：Dingwen Yin Huijuan Xiu Simin Wang Yanfei Pan Na Li Rui Cheng Shaoyan Huang Sha Fan Jinbao Li 

机构地区：[1]College of Bioresources Chemical&Materials Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China [2]National Demonstration Center for Experimental Light Chemistry Engineering Education,Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development,Xi'an 710021,China [3]College of Material Science and Art Design,Inner Mongolia Agricultural University,Hohhot 010018,China

出　　处：《Nano Research》2024年第5期4544-4554,共11页纳米研究（英文版）

基　　金：support of the National Natural Science Foundation of China(Nos.31901265,22178208);the Key Technology R&D Program of Longyou County(No.JHXM2019063).

摘　　要：The intelligent electronic devices have urgent demands for electromagnetic interference(EMI)shielding films with excellent heat dissipation capability.However,it is challenging to obtain excellent EMI shielding and thermal conductivity performances simultaneously.Herein,inspired by mille-feuille structure,the multifunctional EMI shielding films developed by a layer-by-layer self-assembly and hot-pressing strategy.The ingenious introduction of silver nanoparticles(AgNPs)with large specific surface area and highly conductive into the network formed by TEMPO-oxidized cellulose nanofibrils(TOCNFs)with large aspect ratio to form the TOCNFs/AgNPs.And the graphene nanoplates(GNPs)with high conductivity loss distributed alternately with TOCNFs/AgNPs to construct mille-feuille structure,which had highly efficient conductive network,complete thermally conduction pathway and rich heterogeneous interfaces.Consequently,the designed films presented high electrical conductivity of 8520 S/cm,superb EMI effectiveness(SE)of 98.05 dB,and excellent thermal conductivity of 18.82 W/(m·K).Furthermore,the films possessed outstanding Joule heating performances with low voltages,including high heating temperature(100℃),fast response time(<20 s),and impressive heating stability and reliability.Thus,such high-performance EMI shielding films with fascinating thermal conductivity and Joule heating performances have substantial application in flexible electronics,electromagnetic waves shielding and thermal management.

关 键 词：TEMPO-oxidized cellulose nanofibrils/silver nanoparticles(TOCNFs/AgNPs) mille-feuille structure electromagnetic interference shielding thermal conductivity Joule heating 

分 类 号：TB383[一般工业技术—材料科学与工程]