Cui Jin, Huang Li, Ma Jingwei, Li Yibin, Yuan Ye
Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, School of Materials Science and Technology, Hebei University of Technology, Tianjin 300130, People's Republic of China.
School of Materials Science and Engineering, Beihang University, Beijing 100191, People's Republic of China.
Nanoscale. 2022 Oct 27;14(41):15393-15403. doi: 10.1039/d2nr04333e.
Microwave absorbing materials (MAMs) have been identified as an efficient means to solve major electromagnetic pollution problems. Current core-shell composite MAMs are fabricated as single magnetic cores with dielectric shells, yielding decreased magnetic couplings and impedance mismatches. Herein, carbon shell encapsulated core-shell structured zinc ferrate (ZnFeO) sphere composites (CSZF@C) were fabricated using a hydrothermal method and subsequent carbonisation process. The complex permittivity and complex permeability of CSZF@C can be effectively adjusted by varying the parameters of the outer carbon shell. The synergistic effect of carbon shell and inner core-shell structured ZnFeO (CSZF) not only meets impedance matching but also improves electromagnetic energy loss, a result of the unique microstructure. CSZF@C-1 exhibited a considerable reflection loss (RL) of -53.5 dB and an effective absorption bandwidth (EAB) of up to 6.56 GHz, the thickness is only 2.94 mm. Meanwhile, the epoxy resin coating of CSZF@C-1 substantially increases the corrosion resistance of the metal substrate owing to carbon encapsulation. This study presents new ideas for designing efficient multifunctional nanocomposites with high microwave absorption and corrosion resistance.
微波吸收材料（MAMs）已被视为解决主要电磁污染问题的有效手段。当前的核壳复合微波吸收材料是作为具有介电壳的单一磁芯制造的，这导致磁耦合和阻抗失配降低。在此，采用水热法和随后的碳化工艺制备了碳壳包覆的核壳结构铁酸锌（ZnFeO）球形复合材料（CSZF@C）。通过改变外碳壳的参数，可以有效地调节CSZF@C的复介电常数和复磁导率。碳壳与内核壳结构的ZnFeO（CSZF）的协同效应不仅满足了阻抗匹配，还改善了电磁能量损耗，这是独特微观结构的结果。CSZF@C-1表现出相当大的-53.5 dB反射损耗（RL）和高达6.56 GHz的有效吸收带宽（EAB），厚度仅为2.94 mm。同时，由于碳包覆，CSZF@C-1的环氧树脂涂层大大提高了金属基板的耐腐蚀性。本研究为设计具有高微波吸收和耐腐蚀性的高效多功能纳米复合材料提供了新思路。
