Design of Interconnected Carbon Fiber Thermal Management Composites with Effective EMI Shielding Activity

Abstract

Heat dissipation efficiency and electromagnetic interference (EMI) shielding performance are vital to integration, miniaturization, and application of electronic devices. Flexible and designable polymer-based composites are promising candidates but suffer from unavoidable interfacial thermal resistances, anisotropic thermal conductivity, and low shielding of EMI limiting application. Herein, multifunctional epoxy resin (EP)-based composites with an interconnected carbon fibers (CFs) network structure containing a low thermal resistance interfacial were prepared by high-temperature calcination and infiltration. The coherent heat and electron transfer pathways constructed with self-oriented CFs cloth connected by carbon nanotubes (CNTs) converted from leaf-shaped zeolitic imidazolate frameworks (ZIF-L) and stable magnetic property provided by cobalt nanoparticles contained in the CNTs made composites to an integrated in-plane thermal conductivity of up to 7.50 W m −1 K −1 , a through-plane thermal conductivity of 1.96 W m −1 K −1, and an EMI shielding effectiveness of 38.4 dB. Furthermore, the mechanical properties of CFs and the junction effect of CNTs endowed the composites with stability of mechanical property, thermal conductivity, and EMI shielding effectiveness after multiple bendings. The finite element simulation further verified the advantage of CFs network linked by CNTs on heat transfer. This work provides the desired design for the construction of a multifunctional polymer-based composite used in advanced electronic equipment.

Carbon fiber in situ grown ZIF‐67 nanocrystals with excellent electrochemical and interfacial property

“…Both patterns appeared peaks at 25.3°, corresponding to the (002) crystal plane of the graphene structure 47 . The XRD pattern of CF@ZIF also displayed relatively obvious crystal diffraction peaks of ZIF‐67, demonstrating the existence of ZIF‐67 nanocrystals on the CF surface 48 . The introduction of COOH functional groups on the CF surface enabled the coordination with Co 2+ , leading to the appearance of prominent crystal diffraction peaks of ZIF‐67 in CF.…”

“…47 The XRD pattern of CF@ZIF also displayed relatively obvious crystal diffraction peaks of ZIF-67, demonstrating the existence of ZIF-67 nanocrystals on the CF surface. 48 The introduction of COOH functional groups on the CF surface enabled the coordination with Co 2+ , leading to the appearance of prominent crystal diffraction peaks of ZIF-67 in CF. This indicated that ZIF-67 nanocrystals were homogeneously grown on the surface due to the alternating growth of Co 2+ and 2-methylimidazole.…”

Electromagnetic Interference Shielding Performances of Carbon-Fiber-Reinforced PA11/PLA Composites in the X-Band Frequency Range

“…The performance of surrounding electronic devices, information communication security, and human health are seriously affected by this EMI. − So, EMI is a serious problem in many industries, including communications, medical instruments, buildings like hospitals, military applications, and broadcasting. Therefore, the development of efficient, lightweight, and economical EMI shielding materials is important and attracts the attention of researchers and scientists. ,, Various magnetic and electrically conductive materials are used in EMI shielding like metallic and polymeric composites and adhesives. − …”

Cuttlefish‐Inspired Self‐Adaptive Liquid Metal Network Enabling Electromagnetic Interference Shielding and Thermal Management

“…[3,4] Hence, tremendous progress has been made in the development of advanced thermal management and electromagnetic interference (EMI) shielding of high-power electronics. [5][6][7] It is to be noted that thermal management and EMI shielding are always correlated. For example, temperature rise of electronic systems will lead to the decline in EMI shielding efficiency when electronic devices are in operation.…”