TY - JOUR
T1 - Flexible, breathable, and reinforced ultra-thin Cu/PLLA porous-fibrous membranes for thermal management and electromagnetic interference shielding
AU - Chang, Jinlin
AU - Meng, Chen
AU - Shi, Bowen
AU - Wei, Wenyuan
AU - Li, Renzhi
AU - Meng, Jinmin
AU - Wen, Haobin
AU - Wang, Xiangyu
AU - Hu, Zhirun
A2 - Song, Jun
A2 - Liu, Zekun
A2 - Li, Jiashen
PY - 2023/10/20
Y1 - 2023/10/20
N2 - Electromagnetic interference shielding and thermal management by wearable devices show great potential in emerging digital healthcare. Conventional metal films implementing the functions must sacrifice either flexibility or permeability, which is far from optimal in practical applications. In this work, an ultra-thin (15 µm), flexible, and porous Cu/PLLA fibrous membrane is developed by depositing copper particles on the polymer substrate. With novel acetone & heat treatment procedure, the membrane is considerably stronger while maintaining the porous fibre structure. Its fantastic breathability and super high electrical conductivity (9471.8130 S/cm) enable the composites to have fast electrical heating characteristics and excellent thermal conductivity for effective thermal management. Meanwhile, 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 cm2/g at the H band and 8072.73 dB cm2/g at the Ku band respectively). The composites present high flexibility, breathability, and strength with the functions of thermal management and electromagnetic shielding, showing great potential for future portable electronic devices and wearable integrated garments.
AB - Electromagnetic interference shielding and thermal management by wearable devices show great potential in emerging digital healthcare. Conventional metal films implementing the functions must sacrifice either flexibility or permeability, which is far from optimal in practical applications. In this work, an ultra-thin (15 µm), flexible, and porous Cu/PLLA fibrous membrane is developed by depositing copper particles on the polymer substrate. With novel acetone & heat treatment procedure, the membrane is considerably stronger while maintaining the porous fibre structure. Its fantastic breathability and super high electrical conductivity (9471.8130 S/cm) enable the composites to have fast electrical heating characteristics and excellent thermal conductivity for effective thermal management. Meanwhile, 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 cm2/g at the H band and 8072.73 dB cm2/g at the Ku band respectively). The composites present high flexibility, breathability, and strength with the functions of thermal management and electromagnetic shielding, showing great potential for future portable electronic devices and wearable integrated garments.
KW - Electromagnetic interference shielding effectiveness
KW - Thermal management
KW - Thin films
KW - Metal-matrix composites
U2 - 10.1016/j.jmst.2023.01.019
DO - 10.1016/j.jmst.2023.01.019
M3 - Article
SN - 1005-0302
VL - 161
SP - 150
EP - 160
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -