Construction core–shell BCN@PANi composites with broadband microwave absorption performance

• Published in: Journal of materials science. Materials in electronics Vol. 35; no. 5; p. 333
• Main Authors: Guo, Sijia, Wang, Dong, Liu, Xiangdong, Qin, Jianguo, Liu, Chunshan, Xu, Jianwei, Wang, Junfa
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2024; Springer Nature B.V
• Subjects: Acids; Bandwidths; Broadband; Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composite materials; Core-shell structure; Magnetic properties; Materials Science; Mechanical engineering; Mechanical properties; Microwave absorption; Optical and Electronic Materials; Pollution abatement; Polyanilines; Polymers; Ultrawideband
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-024-12048-y

As the problem of electromagnetic pollution becomes more prominent, the design of a material with ultra-wide-band microwave absorption properties has become the focus of electromagnetic pollution prevention and control. Herein, we first used a sacrificial template method to prepare C-doped BN (BCN) using biomass carbon as a template and then used an in-situ synthesis method to grow polyaniline (PANi) on the surface of BCN to prepare BCN@PANi with a core–shell structure. As expected, the BCN@PANi composite exhibits superior microwave absorption properties with a minimum reflection loss (RLmin) of − 34.70 dB at 5.0 mm and an effective absorption bandwidth (EAB) of 14.94 GHz (3.06–18 GHz). Notably, BCN@PANi composites exhibit an ultra-wide microwave absorption bandwidth, covering 83% of the tested frequency. Additionally, the excellent microwave absorption performance is attributed to the modulation of the dielectric and magnetic properties of BN after C doping and the contribution of conductive loss to the composite performance after PANi coating. Moreover, the preparation of BCN@PANi provides a reference for preparing ceramic-based composites in the future.