Thermally conductive MWCNTs/Fe3O4/Ti3C2Tx MXene multi-layer films for broadband electromagnetic interference shielding

doi:10.1016/j.jmst.2022.05.009

Abstract

Abstract:

The Ti₃C₂T_x MXene is thought to be a promising candidate for next-generation electromagnetic interference (EMI) shielding materials. However, its broadband shielding capability and thermal conduction performance are insufficient to meet the growing demands. Herein, we reported a layer-by-layer composite film composed of Ti₃C₂T_x MXene, multi-walled carbon nanotubes (MWCNTs), and Fe₃O₄ nanoparticles. Benefitting from the architecture and the synergistic effect of components, the obtained composite film exhibited high comprehensive performance. Specifically, the introduction of Fe₃O₄ magnetic nanoparticles effectively reduced the impedance mismatch between the composite film and air and enhanced the magnetic loss of the composite film. The layered structure prolonged the transmission path of electromagnetic waves inside the composite film and constructed a rich conductive network, causing interfacial polarization and ohmic loss. The results indicated that the composite film (52 μm) delivered a high EMI shielding effectiveness of 49 dB in the frequency range from X-band to K_u-band. Furthermore, the MWCNTs layers in the composite films provided numerous heat transfer channels, reducing phonon scattering during heat transfer and resulting in a maximum thermal conductivity of 8.241 W/(m K).

Key words: Multi-layer film, Ti₃C₂T_x Mxene, EMI shielding, Thermal conduction

Heguang Liu, Zhe Wang, Yujia Yang, Shaoqing Wu, Chukai Wang, Caiyin You, Na Tian. Thermally conductive MWCNTs/Fe₃O₄/Ti₃C₂T_x MXene multi-layer films for broadband electromagnetic interference shielding[J]. J. Mater. Sci. Technol., 2022, 130: 75-85.

Figures/Tables 10

Fig. 1. Schematic diagram of the composite film preparation process.

Fig. 2. (a) XRD patterns of Ti3AlC2 MAX phase and Ti3C2Tx MXene; (b) TEM image of Ti3C2Tx MXene; (c) SEM image of Ti3C2Tx MXene; (d) XRD pattern of Fe3O4; (e) TEM image of Fe3O4; (f) SEM image of Fe3O4.

Fig. 3. (a) XPS spectra of Ti3C2Tx MXene; (b) AFM image of Ti3C2Tx MXene nanosheets; (c) TEM and SAED images of Ti3C2Tx MXene nanosheets; (d) Ti 2p spectra of Ti3C2Tx MXene; (e) HRTEM image of Ti3C2Tx MXene nanosheets; (f) Ti3C2Tx MXene nanosheets dispersed in water with significant Tyndall effect.

Fig. 4. (a) Cross-sectional SEM images of pure MXene film; (b-e) cross-sectional SEM images of MFT7, MFT11, MFT15, and MFT19; (f) cross-sectional image and EDS mapping of MFT15.

Fig. 5. (a-c) EMI SET, SER, and SEA of the composite films in the X-band. (d) Average EMI SE of the composite films in the X-band.

Fig. 6. (a-c) EMI SET, SER, and SEA of the composite films in the Ku band. (d) Average EMI SE of the composite films in the Ku band.

Fig. 7. (a) Complex permittivity real part ε' and (b) imaginary part ε''; and (c) complex permeability real part μ' and (d) imaginary part μ″ of the composite film in the X-band.

Fig. 8. (a) Complex permittivity real part ε' and (b) imaginary part ε''; and (c) complex permeability real part μ' and (d) imaginary part μ″of the composite film in the Ku-band.

Fig. 9. (a, b) Attenuation constants γ of the composite films in X-band and Ku-band. (c, d) Skinning depth δ of the composite films in X-band and Ku-band. (e) Schematic diagram of EMI shielding mechanism of the composite films.

Fig. 10. (a) Thermal conductivity of the composite films; (b) thermal diffusion coefficient of the composite films.

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Thermally conductive MWCNTs/Fe₃O₄/Ti₃C₂T_x MXene multi-layer films for broadband electromagnetic interference shielding

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