Bioinspired Ultrathin MXene/CNC Composite Film for Electromagnetic Interference Shielding

doi:10.15541/jim20190148

Abstract

Abstract:

Electromagnetic interference (EMI) shielding films with excellent mechanical properties are highly promising for applications in flexible devices, automotive electronics and aerospace. Inspired by the excellent mechanical properties of nacre derived from its micro/nanoscale structure, high-performance MXene/Cellulose nanocrystals (CNC) composite films were prepared by simple solution blending and followed vacuum-assisted filtration process. The presence of CNC significantly improves the mechanical properties with tensile strength increasing from 18 MPa to 57 MPa and toughness improving from 70 kJ/m ³ to 313 kJ/m ³. Meanwhile, the composite film still exhibits high electrical conductivity (up to 10 ⁴ S/m) and excellent EMI shielding efficiency (over 40 dB) with a small thickness of 8 μm.

Key words: MXene, mechanical property, electromagnetic interference shielding

CLC Number:

TB321

LIU Zhang-Shuo, LIU Ji, DAI Yang, LI Xiao-Feng, YU Zhong-Zhen, ZHANG Hao-Bin. Bioinspired Ultrathin MXene/CNC Composite Film for Electromagnetic Interference Shielding[J]. Journal of Inorganic Materials, 2020, 35(1): 99-104.

Figures/Tables 4

Fig. 1 Morphology and structure of the Ti3C2T

Fig. 2 (a) FT-IR spectra of Ti3C2Tx, CNC and Ti3C2Tx/CNC films; (b) XPS broad surveys of Ti3C2Tx and Ti3C2Tx/CNC films; (c) XRD patterns of Ti3C2Tx/CNC films; (d) TGA curves of Ti3C2Tx, CNC and Ti3C2Tx/CNC films

Fig. 3 (a) Tensile stress and toughness of Ti3C2Tx/CNC films with different Ti3C2Tx content; (b) Stress-strain curves of Ti3C2Tx film and M60-C40 composite film; (c) Side view SEM image of M60-C40

Fig. 4 (a) Electrical conductivity of Ti3C2Tx/CNC films with different Ti3C2Tx contents; (b) EMI SE of Ti3C2Tx/CNC films with different Ti3C2Tx contents; (c) Total EMI SE (SET) and its absorption (SEA) and reflection (SER) mechanism in Ti3C2Tx and M60-C40

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