Recent Progress in Iron-Based Microwave Absorbing Composites: A Review and Prospective

Abstract

With the rapid development of communication technology in civil and military fields, the problem of electromagnetic radiation pollution caused by the electromagnetic wave becomes particularly prominent and brings great harm. It is urgent to explore efficient electromagnetic wave absorption materials to solve the problem of electromagnetic radiation pollution. Therefore, various absorbing materials have developed rapidly. Among them, iron (Fe) magnetic absorbent particle material with superior magnetic properties, high Snoek’s cut-off frequency, saturation magnetization and Curie temperature, which shows excellent electromagnetic wave loss ability, are kinds of promising absorbing material. However, ferromagnetic particles have the disadvantages of poor impedance matching, easy oxidation, high density, and strong skin effect. In general, the two strategies of morphological structure design and multi-component material composite are utilized to improve the microwave absorption performance of Fe-based magnetic absorbent. Therefore, Fe-based microwave absorbing materials have been widely studied in microwave absorption. In this review, through the summary of the reports on Fe-based electromagnetic absorbing materials in recent years, the research progress of Fe-based absorbing materials is reviewed, and the preparation methods, absorbing properties and absorbing mechanisms of iron-based absorbing materials are discussed in detail from the aspects of different morphologies of Fe and Fe-based composite absorbers. Meanwhile, the future development direction of Fe-based absorbing materials is also prospected, providing a reference for the research and development of efficient electromagnetic wave absorbing materials with strong absorption performance, frequency bandwidth, light weight and thin thickness.

A coral-like nano-PCF composite as a broad-bandwidth microwave absorber

“…An excellent absorber should possess a good impedance match and robust reflection loss simultaneously. 23,24 A good impedance matching ability of an absorber means most radiating microwaves penetrate the MWA. 25,26 Significant reflection loss will attenuate the incident microwaves, and the absorption strength may be extended.…”

Graphene/Polyimide Composite Aerogels for Superior Electromagnetic-Wave-Absorbing Materials with High Thermal Stability and Absorption Effectiveness

“…With the rapid development of information technology, a variety of electronic devices have become indispensable products in people’s daily lives. However, the electromagnetic radiation of these devices will inevitably affect human physical health and also interfere with the working of other electronic equipment. , In addition, in the military field, detecting prevention plays a very important role in the stealth technology of modern weapons because of various new radars and detectors emerging. , Therefore, the development of electromagnetic wave (EMW)-absorbing materials (EWAMs) is a hot research subject. Because application scenarios are diverse and EWAMs might be used in air vehicles at high temperatures or in harsh conditions, it is increasingly urgent to develop advanced EWAMs with a large absorption capacity in a wide frequency range with a light weight and excellent stability through a facile approach. , …”

Well-matched PANI@FePO4@FeSi hybrid composite with excellent microwave absorption property

“…Fe, Co or Ni magnetic metal-based composites play critical role as microwave absorbing materials for their large permeability, high saturation magnetization and curie temperature [1][2][3][4]. However, the skin effect weakens impedance matching and restrains further improving microwave absorption ability [5][6][7][8].…”