CoNi/MXene@CoNi/MXene microsphere/silicone rubber multilayered composites for ultra-broadband microwave absorption

• Published in: Journal of alloys and compounds 2024-07, Vol.992, p.174573, Article 174573
• Main Authors: Hu, Jiana, Liang, Caiyun, Li, Jiadong, Lin, Chuanwei, Liang, Yongjiu, Dong, Dewen
• Format: Article
• Language: English
• Subjects: Heterogeneous interface; Impedance matching; Microwave absorption; Multilayered structure; MXene
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2024.174573

2D transition metal carbide/nitride (MXene) nanomaterials have prospective applications in high-performance microwave absorption (MA). However, the excessively high permittivity, absence of magnetic loss, and susceptible oxidizability of MXene severely hinder the enhancement of its MA properties. Here, we used a facile organic solution–phase thermal decomposition method to prepare dielectric–magnetic MXene@CoNi nanocomposites with heterojunctions, which can effectively prevent the oxidation of MXene. Subsequently, the MXene@CoNi nanocomposites were integrated with magnetic CoNi alloys, MXene microspheres (MXene MPs), and a silicon rubber (SR) matrix to construct multilayered CoNi/MXene@CoNi/MXene MPs/SR composites by casting and curing. Benefiting from the multilayered structure and complementary effects of the dielectric and magnetic components, the multilayered CoNi/MXene@CoNi/MXene MPs/SR composites composed of matching, absorbing, and reflective layers showed a remarkable minimum reflection loss of −53.3 dB and an ultra-broad effective absorption bandwidth up to 11.12 GHz at a thickness of 2.96 mm. These results demonstrated the developed multilayered composites are promising candidates for high-performance MA. Our study provides new insights into the development of ultra-broadband MXene-based absorbent materials. •The heterogeneous MXene@CoNi nanocomposites were prepared by organic solution-phase thermal decomposition method.•A structural design strategy for efficient MXene-based microwave-absorbing materials was proposed.•The appropriate impedance matching and enriched loss mechanism enhanced the microwave absorption properties.•The multilayered composites showed superior microwave absorption with RLmin of −53.3 dB and EAB of 11.12 GHz.