Fe/Co decorated C@CNTs derived from bimetallic metal-organic-framework for microwave absorption with wide bandwidth

• Published in: Journal of alloys and compounds 2023-12, Vol.967, p.171645, Article 171645
• Main Authors: Wang, Yin, Man, Qikui, Zhu, Shiqi, Lei, Zhenkuang, Tan, Guoguo, Guan, Hongtao
• Format: Article
• Language: English
• Subjects: Bimetallic MOFs; Carbon nanotube; Microwave absorption
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2023.171645

It’s a hurry to introduce a lightweight and high-efficiency microwave absorption material that is easy to synthesize, since the electromagnetic interference pollution is getting increasingly serious. Carbon-based microwave absorption material based on bimetallic metal-organic frameworks (MOFs) gets high conductivity and good magnetism at the same time, and thus can be regarded as an efficient microwave absorber with lightweight. Herein, we introduce an easy method to compose bimetallic carbon-based microwave absorbers based on ZIF-67. By changing the proportion of Fe3+ and Co2+, not only the magnetism of the material can be adjusted, the amount of carbon nanotubes (CNTs) and so as the dielectric property of the material can also be regulated. The method of introducing precursors at room temperature and then calcinating at an Ar atmosphere is simple to repeat and appropriate for mass production. When the dosage molar ratio of Co2+: Fe3+ is 3: 2, the minimum reflection loss (RLmin) can reach − 24.83 dB while the effective absorption bandwidth (EAB) can reach 5.14 GHz when the thickness is 1.7 mm, under a 30 wt% filling loading. We believe that this work can provide a reliable method to introduce carbon-based microwave absorption material based on bimetallic MOF materials. [Display omitted] •The manageable CNTs grow on the surface of the Fe-doped carbonized ZIF−based microwave absorption material.•The amount of doping can affect the conductivity and magnetism synchronously and makes the impedance match.•The lightweight (0.454 g/cm3) absorber can achieve an effective bandwidth of 5.14 GHz with a thickness of 1.7 mm.