J. Mater. Sci. Technol. ›› 2024, Vol. 191: 23-32.DOI: 10.1016/j.jmst.2023.12.035

• Research Article • Previous Articles     Next Articles

Robust liquid metal reinforced cellulose nanofiber/MXene composite film with Janus structure for electromagnetic interference shielding and electro-/photothermal conversion applications

Hui Zhaoa,b,*, Tong Gaoa, Jin Yunc, Lixin Chena,*   

  1. aShaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China;
    bNorthwest Institute for Nonferrous Metal Research, Xi'an 710016, China;
    cSchool of Chemical Engineering and Clothing, Shaanxi Polytechnic Institute, Xianyang 712000, China
  • Received:2023-11-17 Revised:2023-12-04 Accepted:2023-12-04 Online:2024-08-20
  • Contact: *Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Poly-technical University, Xi'an 710072, China. E-mail addresses: zhnwpu@126.com (H. Zhao), lixin@nwpu.edu.cn (L. Chen).

Abstract: MXene-based composite films are regarded as up-and-coming multifunctional electromagnetic interfer-ence (EMI) shielding materials. However, the conflict between strong mechanical properties and high electrical conductivity hinders their application in modern integrated electronics. Herein, in virtue of density-induced sedimentation, robust and multifunctional liquid metals-reinforced cellulose nanofibers (CNF)/MXene (LMs-CNF/MXene) composite films with Janus structure are fabricated by one-step vacuum-assisted filtration method. Not only does the nacre-like structure of the CNF/MXene layer not destroy, but the deposited liquid metals (LMs) layer can serve as conductive potentiation. Due to the special Janus structure, an “absorption-reflection-reabsorption”shielding process is created in LMs-CNF/MXene composite film to strengthen EMI shielding performance. Its shielding effectiveness can reach 51.9 dB at ∼27 μm, and the reflection coefficient falls to 0.89, below those of reported MXene-based shielding films. Meanwhile, the CNF/MXene layer can endow composite films with excellent mechanical properties with a super tensile strength of 110.3 MPa. Notably, the LMs-CNF/MXene EMI shielding composite films also integrate outstanding photo-/electrothermal conversion performances, which can effectively deice out-doors. The robust LMs-CNF/MXene EMI shielding composite films with satisfying photo-/electrothermal performances have extensive application prospects, such as aerospace, wearable electronics, and portable electronics.

Key words: MXene film, Janus structure, Mechanical properties, Electromagnetic interference shielding, Electro-/photothermal conversion