Toughness and High‐Electromagnetic‐Shielding CPM Composite Film with Multilayer Sandwich Structure Based on Mxene

Abstract

Electromagnetic shielding (EMI) films with excellent EMI and mechanical performances has been a hotspot in the EMI field. Herein, CNF/PDA@MXene (CPM) composite films exhibiting satisfactory mechanical and EMI properties are fabricated via vacuum filtration using PDA@MXene as the shielding layer and CNF/PDA as the mechanical layer. Results revealed that the optimal mass ratio of MXene to hydroxytyramine (DA) is 100:6 and that of CNF to DA is 70:30. The optimal arrangement is comprised by two layers of CNF/PDA and one layer of PDA@MXene. The breaking strength, breaking elongation, and toughness of the CPM composite film are 198.0 MPa, 2.9%, and 3.22 MJ m−3, which increased by 27.4, 3.5, and 106 times compared to those of a pure MXene film, respectively. Furthermore, the EMI efficiency of the CPM composite film reached 46.1 dB. Moreover, the EMI performance of the CPM composite film exhibited only slight changes under the conditions of ultrasonic shock, humid environment, and bending for 1000 times.

Ti3C2Tx MXene Nanosheet/Cellulose Nanofiber/Poly(ethylene glycol) Porous Composites for Absorption-Dominated Electromagnetic Interference Shielding

“…A large number of electronic devices have emerged with the rapid development of technology, and their excessive use has created serious electromagnetic pollution problems. − Consequently, numerous researchers are focused on developing electromagnetic shielding materials in order to mitigate the adverse effects on human health and machine operation. , MXene, as a novel transition metal carbide two-dimensional crystalline material, has attracted much attention in the field of electromagnetic shielding effectiveness (EMI SE) due to its high electrical conductivity, film-forming performance, hydrophilicity, low density, and tunable active surface. − Chu et al used cellulose nanofiber (CNF) and MXene to construct ordered multilayer composite films with a controllable conductive gradient by layer-by-layer vacuum filtration method. The dielectric loss provided by MXene and the coordination of polarization with loss at the interfaces contribute to the outstanding EMI shielding effectiveness (EMI SE) (39 dB) and absorption effectiveness (28 dB) of the films.…”