One-dimensional Ag@NC-Co@NC composites with multiphase core-shell hetero-interfaces for boosting microwave absorption. (29th September 2022)

• Record Type: Journal Article
• Authors: Sun, Mengxiao; Xiong, Ziming; Zhang, Zhongwei; Chen, Chaochan; Qin, Long; Wang, Derong; Wu, Fan; Liu, Panbo
• Is Part Of: Composites science and technology. Volume 228(2022)
• Publication Date: 2022-09-29
• Subjects: Structural composites -- Interface -- Nano particles -- Electrical properties -- Microwave absorption; Composite materials -- Periodicals; Composite materials; Fibrous composites; Periodicals; 620.118
• DOI: 10.1016/j.compscitech.2022.109663
• Languages: English
• ISSNs: 0266-3538

Abstract

Abstract: Core-shell structural absorbers have attracted arousing attention in boosting microwave absorption in theory, however, it still remains great challenges to construct multiphase core-shell hetero-interfaces to manipulate interfacial polarization and final absorption performance. Herein, we propose a competition optimization strategy to fabricate one-dimensional (1D) Ag@NC-Co@NC composites, in which fractured Ag particles are encapsulated into 1D N-doped carbon networks and magnetic Co nanoparticles are wrapped by N-doped carbon shells, yielding to multiphase core-shell hetero-interfaces. Benefiting from conductive 1D carbon networks, dielectric-magnetic synergistic effect and abundant multiphase hetero-interfaces, the obtained composites exhibit promoted impedance characteristics and overwhelming microwave absorption. The minimum reflection loss achieves as high as −57.6 dB and the effective absorption bandwidth is 5.8 GHz at 3.2 mm with 40 wt% filler loading. This concept provides us an inspiring strategy to design and fabrication of high-performance absorbers by constructing multiphase core-shell hetero-interfaces. Graphical abstract: Image 1