Engineering the electronic structure on MXenes via multidimensional component interlayer insertion for enhanced electromagnetic shielding. (1st March 2023)

• Record Type: Journal Article
• Authors: Huang, Mengqiu; Wang, Lei; Zhao, Biao; Chen, Guanyu; Che, Renchao
• Is Part Of: Journal of materials science & technology. Volume 138(2023)
• Page Start: 149
• Page End: 156
• Publication Date: 2023-03-01
• Subjects: Ti3C2Tx MXene -- Magnetic modulation -- Electromagnetic-interference shielding -- Nickel flakes -- Freestanding film; Metals -- Periodicals; Materials science -- Periodicals; Materials science; Metals; Periodicals; 620.1105
• DOI: 10.1016/j.jmst.2022.07.047
• Languages: English
• ISSNs: 1005-0302

Abstract

Highlights: CNTs/Ni hybrids were used as an isolation agent to disperse Ti3 C2 Tx 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). Abstract: 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 Ti3 C2 T x /CNTs/Ni film assembled by 1D multi-walled carbon nanotubes (MWCNTs)/Ni and 2D Ti3 C2 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 Ti3 C2 T x layers to form magnetized Ti3 C2 T x -based functional film with a compact and laminated structure. Due to the outstanding electron migration capacity in the highly conductive Ti3 C2 T x sheet and multiple internal reflections from porous and segregated structures, the optimized Ti3 C2 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. Graphical abstract: Image, graphical abstract