J. Mater. Sci. Technol. ›› 2025, Vol. 223: 285-286.DOI: 10.1016/j.jmst.2024.10.029

• Research article • Previous Articles     Next Articles

Janus-inspired alternating architecture CNF/MXene/ZnFe2O4@PANI composite films with outstanding electromagnetic interference shielding and Joule heating

Lian Yina, Jiale Zhanga, Jianjian Luoa, Yongqian Shib, Bin Yuc, Sheng Zhangd, Keqing Zhoua,d,*   

  1. aFaculty of Engineering, China University of Geosciences (Wuhan), Wuhan 430074, China;
    bCollege of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, China;
    cState Key Laboratory of Fire Science, University of Science & Technology of China, Hefei 230026, China;
    dState Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 10029, China
  • Received:2024-08-31 Revised:2024-10-11 Accepted:2024-10-11 Published:2025-07-10 Online:2024-11-19
  • Contact: *E-mail address: zhoukq@cug.edu.cn (K. Zhou)

Abstract: With the continuous advancement of electronic devices, flexible thin films with both thermal management functions and excellent electromagnetic interference (EMI) shielding properties have received much attention. Hence, inspired by Janus, a CNF/MXene/ZnFe2O4@PANI composite film with an asymmetric gradient alternating structure was successfully prepared by adjusting the filler content of the conductive and magnetic layers using a vacuum-assisted filtration method. Benefiting from the magnetic resonance and hysteresis loss of ZnFe2O4@PANI, conductive loss and dipole polarization of MXene, as well as the exclusive “absorption-reflection-reabsorption” shielding feature in the alternating multilayered films, CM&CZFP-4 G film has superior EMI shielding performance, with an EMI SE of up to 45.75 dB and shielding effectiveness of 99.99 %. Surprisingly, the composite film maintains reliable EMI shielding properties even after prolonged erosion in harsh environments such as high/low temperatures, high humidity, acids and alkalis. Furthermore, the CM&CZFP-4 G responded quickly within about 50 s and reached a maximum steady-state temperature of 235.8 °C at an applied voltage of 9.0 V, indicating the obtained film acquired outstanding and controllable Joule heating performance. This result was attributed to the homogeneous dispersion of MXene to build up a conductive network and endow the CNF/MXene with high conductivity. Meanwhile, the fire resistance of CM&CZFP-4 G was significantly improved compared to pure CNF, which guaranteed fire safety during its application. Additionally, contributed by long fiber entanglement of CNF, extensive hydrogen-bonding interactions and multilayer structural design, the CM&CZFP-4 G film exhibits excellent mechanical characteristics, with the tensile strength and fracture strain of 27.74 MPa and 6.21 %, separately. This work offers a creative avenue to prepare multifunctional composite films with electromagnetic shielding and Joule heating for various application environments.

Key words: MXene, Asymmetric, Alternating architecture, Electromagnetic interference shielding, Joule heating