Abstract
• CNTs/Ni hybrids were used as an isolation agent to disperse Ti 3 C 2 T x sheets in the interlayers, which form a multiple-dimensional laminated structure. • Introduction of 2D hexagonal magnetic Ni flakes boosts interfacial polarization and magnetic-responding ability, visualized by electron holography. • The 3D freestanding films can achieve precise regulation of components and excellent EMI shielding performance (67.4 dB). MXene-based functional electromagnetic interference (EMI) shielding films are highly desirable for modern integrated electronic and telecommunication systems in aerospace, military, artificial intelligence, and smart and wearable electronics field. In this work, 3D freestanding Ti 3 C 2 T x /CNTs/Ni film assembled by 1D multi-walled carbon nanotubes (MWCNTs)/Ni and 2D Ti 3 C 2 T x MXene sheets was synthesized by a facile vacuum filtration process. By electrostatic incorporation, hexagonal nickel plates embed on the CNTs and then the CNTs/Ni insert into the Ti 3 C 2 T x layers to form magnetized Ti 3 C 2 T x -based functional film with a compact and laminated structure. Due to the outstanding electron migration capacity in the highly conductive Ti 3 C 2 T x sheet and multiple internal reflections from porous and segregated structures, the optimized Ti 3 C 2 T x /CNTs/Ni composite films show excellent EMI shielding effectiveness of 67.4 dB with electrical conductivity of 744 S cm –1 . Surprisingly, a magnetization compensation strategy is built to boost the EMI shielding effectiveness with decreased conductivity. Meanwhile, the visual magnetic coupling phenomenon and charge distribution in the heterogeneous interfaces could be observed in the reconstructed electron holography images. Those encouraging results shed light on novel magnetized MXene-based functional films for high-performance EMI shielding.
Published Version
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