Enhanced Electromagnetic Shielding and Thermal Management Properties in MXene/Aramid Nanofiber Films Fabricated by Intermittent Filtration

Abstract

High-efficiency electromagnetic interference (EMI) shielding and heat dissipation synergy materials with flexible, robust, and environmental stability are urgently demanded in nextgeneration integration electronic devices. In this work, we report the lamellar MXene/Aramid nanofiber (ANF) composite films, which establish a nacre-like structure for EMI shielding and heat dissipation by using the intermittent filtration strategy. The MXene/ ANF composite film filled with 50 wt % MXene demonstrates enhanced mechanical properties with a strength of 230.5 MPa, an elongation at break of 6.2%, and a toughness of 11.8 MJ•m 3 (50 wt % MXene). These remarkable properties are attributed to the hydrogen bonding and highly oriented structure. Furthermore, due to the formation of the MXene conductive network, the MXene/ANF composite film shows an outstanding conductivity of 624.6 S/cm, an EMI shielding effectiveness (EMI SE) of 44.0 dB, and a superior specific SE value (SSE/t) of 18847.6 dB•cm 2 /g, which is better than the vacuum filtration film. Moreover, the MXene/ANF composite film also shows a great thermal conductivity of 0.43 W/m•K. The multifunctional MXene/ANF composite films with high-performance EMI shielding, heat dissipation, and joule heating show great potential in the field of aerospace, military, microelectronics, microcircuit, and smart wearable electronics.

Highly Anisotropic Carbonized Wood as Electronic Materials for Electromagnetic Interference Shielding and Thermal Management

“…At 40 s, LED chip with CW-90°as thermal interface material exceeds 80°C, however, LED chip with CW-0°as thermal interface material maintains a stable temperature below 60 °C after 20 s, which can meet the practical application requirement for the LED chip. [47,48] Figure 10a shows the temperature variation of the carbonized wood with time under a direct current voltage (0.5 V ≈ 2.0 V, the current direction is parallel to wood grain). The surface temperature of the carbonized wood increases with the increasing voltage, and the steady-state temperature can be linearly fitted to the square of the voltage, proving that carbonized wood has a controllable thermoelectric energy conversion (Figure 10b).…”

Ultrathin and Flexible ANF/APP/PRGO Composite Films for High-Performance Electromagnetic Interference Shielding and Joule Heating

“…The increase in electric heating performance may be due to the reduced sheet resistance, which follows Joule's law (Q = U 2 /Rt, where Q, U, R, and t denote heat production, applied voltage, resistance, and operating time, respectively). 50 More importantly, the low thickness (∼22 μm) and the good thermal conductivity of the conductive layer allow the surface temperature to quickly reach saturation after the voltage is applied and rapidly cooled to room temperature after the voltage is stopped.…”

Carbonized Syndiotactic Polystyrene/Carbon Nanotube/MXene Hybrid Aerogels with Egg-Box Structure: A Platform for Electromagnetic Interference Shielding and Solar Thermal Energy Management

“…For instance, high-efficiency EMI shielding and heat dissipation synergy materials were achieved by the lamellar MXene/aramid nanofiber (ANF) composite films with a nacrelike structure. 47 Electronic textiles were constituted by MXene and AgNWs, showing self-powered pressure sensing, ultrafast joule heating, and highly efficient EMI shielding. 48 A wearable MXene@cellulose hybrid film was also prepared, exhibiting high EMI SE value, passive solar radiative heating, and active Joule heating.…”