Flexible,breathable,and reinforced ultra-thin Cu/PLLA porous-fibrous membranes for thermal management and electromagnetic interference shielding  

作　　者：Jinlin Chang Chen Meng Bowen Shi Wenyuan Wei Renzhi Li Jinmin Meng Haobin Wen Xiangyu Wang Jun Song Zhirun Hu Zekun Liu Jiashen Li 

机构地区：[1]Department of Materials,The University of Manchester,Manchester M139PL,UK [2]School of Mechanical,Aerospace and Civil Engineering,The University of Manchester,Manchester M139PL,UK [3]Department of Chemistry,The University of Manchester,Manchester M139PL,UK [4]Materdicine Lab,School of Life Sciences,Shanghai University,Shanghai 200444,China [5]Department of Electrical and Electronic Engineering,The University of Manchester,Manchester M139PL,UK [6]Botnar Research Center,University of Oxford,Old Road,Headington,Oxford OX37LD,UK

出　　处：《Journal of Materials Science & Technology》2023年第30期150-160,共11页材料科学技术（英文版）

基　　金：We acknowledge the support of the Electron Microscopy Centre at The University of Manchester.

摘　　要：Electromagnetic interference shielding and thermal management by wearable devices show great po-tential in emerging digital healthcare.Conventional metal films implementing the functions must sacri-fice either flexibility or permeability,which is far from optimal in practical applications.In this work,an ultra-thin(15μm),flexible,and porous Cu/PLLA fibrous membrane is developed by depositing cop-per particles on the polymer substrate.With novel acetone&heat treatment procedure,the mem-brane is considerably stronger while maintaining the porous fibre structure.Its fantastic breathabil-ity and super high electrical conductivity(9471.8130 S/cm)enable the composites to have fast electri-cal heating characteristics and excellent thermal conductivity for effective thermal management.Mean-while,the porous polymer substrate structure greatly enhances the diffusion of conductive substances and increases the electromagnetic interference shielding effectiveness of the membranes(7797.98 dB cm^(2)/g at the H band and 8072.73 dB cm^(2)/g at the Ku band respectively).The composites present high flexibility,breathability,and strength with the functions of thermal management and electromag-netic shielding,showing great potential for future portable electronic devices and wearable integrated garments.

关 键 词：Electromagnetic interference shielding EFFECTIVENESS Thermal management Thin films Metal-matrix composites 

分 类 号：TB3[一般工业技术—材料科学与工程]