Acta Phys. -Chim. Sin.

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Multi-scale dielectric loss engineering in (Ta2/3Ti1/3)2CTx MXene/sulfide heterostructures for electromagnetic wave attenuation

Shijie Zhang1, Ruiqi Wang1, Shun Wang1, Li Tian1, Panpan Wang1, Xiaowei Liang1, Airong Wang2, Yupeng Shi1, Zhiwei Zhao1   

  1. 1 School of Material Science and Engineering, Henan University of Technology, Zhengzhou 450001, Henan Province, China;
    2 School of Electro-Mechanical Engineering, Zhongyuan Institute of Science and Technology, Xuchang 461000, Henan Province, China
  • Received:2026-06-08 Revised:2026-07-24 Accepted:2026-07-25
  • Contact: Shijie Zhang, Shun Wang, Xiaowei Liang E-mail:zsj562389@sina.com;shun_wang@haut.edu.cn;liangxw@haut.edu.cn

Abstract: The rational regulation of dielectric loss behavior and impedance matching remains a critical challenge for developing high-performance electromagnetic wave absorbers. Herein, a novel solid-solution (Ta2/3Ti1/3)2CTx MXene/CuInS2 (TTC/CS) heterostructure was successfully fabricated through a microwaveassisted solvothermal strategy. Benefiting from the intimate coupling nanosheets and semiconductive CuInS2, a multi-scale dielectric loss engineering platform was established to simultaneously optimize electromagnetic attenuation capability and impedance matching characteristics. Structural analyses demonstrate the successful formation of abundant TTC/CS heterointerfaces accompanied by significant interfacial charge redistribution. The synergistic effects originating from intrinsic vacancies, surface functional groups, multi-cation configurations, and heterojunction interfaces generate abundant polarization centers and multiple dielectric relaxation processes. Meanwhile, the interconnected layered architecture promotes charge transport, conduction loss, and multiple reflections/scattering of incident electromagnetic waves. As a result, the optimized TTC/CS-3 composite exhibits superior electromagnetic wave absorption performance, delivering a broad effective absorption bandwidth (EAB) of 4.56 GHz at a thickness of only 1.9 mm. Electromagnetic parameter analysis reveals that the outstanding performance originates from the cooperative optimization of attenuation capability and impedance matching. Furthermore, radar cross-section simulations demonstrate significantly suppressed electromagnetic scattering behavior for the optimized composite. This work provides an effective strategy for constructing MXene-based heterostructures through multi-scale dielectric configuration and offers new insights into the design of lightweight, broadband, and highly efficient electromagnetic protection materials.

Key words: (Ta2/3Ti1/3)2CTx, Heterojunctions, Dielectric relaxation, Balanced impedance matching, Electromagnetic protection