J. Mater. Sci. Technol. ›› 2024, Vol. 179: 187-197.DOI: 10.1016/j.jmst.2023.08.055

• Research Article • Previous Articles     Next Articles

Cl-terminated decoration to modulate the permittivity of MXene for enhanced electromagnetic-absorbing performance

Yunfei Hea, Dongdong Liua,*, Qiang Sua, Bo Zhonga,*, Long Xiaa, Xiaoxiao Huangb,c   

  1. aSchool of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264009, China;
    bSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
    cMIIT Key Laboratory of Advanced Structural-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China
  • Received:2023-07-28 Revised:2023-08-26 Accepted:2023-08-28 Published:2024-04-20 Online:2024-04-15
  • Contact: *E-mail addresses: liudongdonghit@163.com (D. Liu), zhongbo@hit.edu.cn (B. Zhong).

Abstract: The explosive growth of communication technology has given rise to a large number of high-quality electromagnetic wave (EMW) absorbing materials, and single-component materials are often difficult to satisfy the demand. In this study, we propose an etching method of molten chlorine salts under vacuum to prepare Cl-terminated MXene (MX-Cl) which can meet the requirements of “thin, light, wide and strong” and realize the application of single-component absorbing materials. In the X and Ku bands, MX-Cl achieves a strong reflection loss of-42.99 dB and an effective absorption bandwidth of 3.44 GHz with the 1.2 mm matching thickness. The presence of Cl groups restricts the free electron movement of surface-Ti, which controls the conductivity of the MX-Cl and optimizes its permittivity. Dipole polarization induced by Ti-Cl, interfacial polarization between MXene layers and multiple scattering effects inside the layers all significantly increase the dielectric loss of the MX-Cl considerably. This study provides a new approach to investigating the effect of single atoms on the dielectric properties of materials. This work also offers a simple and low-cost process for the preparation of single-component MXene EMW-absorbing materials.

Key words: Cl-terminated MXene, Conductivity mechanism, Multi-polarization effect, Electromagnetic wave absorption