Ultra-wideband electromagnetic interference shielding effectiveness composite with elevated thermal conductivity

With the advent of the microelectronics era, the electromagnetic radiation and heat accumulation of electronic devices have evolved critical issues to be solved. Herein, polydimethylsiloxane (PDMS) based composites with a continuous carbon fiber (CFs) network structure connected via carbon nanotubes (CNTs) containing cobalt nanoparticles is fabricated via heat treatment and vacuum-assisted impregnation. Beneficial from the allgraphene topological network and stable magnetism, the composite has more than 35 dB EMI shielding effectiveness in the ultra-wideband of 8 similar to 40 GHz, even reach as high as 75.33 dB in the Ka-band. Meanwhile, the effective thermal conduction pathways formed by CNTs and CFs make the thermal conductivity of the composite reach 1.08 W m(-1) K-1. More significantly, the composite can still maintain high electromagnetic shielding and thermal conductivity after the 1000 bending tests, which verifies the excellent structural stability of the composite. Such a versatile composite has broad application prospects in a precision electronic device.

Automated summary

A versatile composite material, consisting of polydimethylsiloxane (PDMS) with a continuous carbon fiber (CFs) network structure connected via carbon nanotubes (CNTs) containing cobalt nanoparticles, has been fabricated. The composite demonstrates excellent electromagnetic shielding effectiveness in the ultra-wideband range of 8 to 40 GHz, reaching as high as 75.33 dB in the Ka-band, due to its allgraphene topological network and stable magnetism. Additionally, the composite exhibits a thermal conductivity of 1.08 W m(-1) K-1, thanks to the effective thermal conduction pathways formed by CNTs and CFs. Even after 1000 bending tests, the composite maintains high electromagnetic shielding and thermal conductivity, confirming its outstanding structural stability. This versatile composite material holds great potential for applications in precision electronic devices.