From waste to wealth: Crumb rubber@carbon nanotube/Fe3O4 composites towards highly effective electromagnetic microwave absorption with wide bandwidth

Electromagnetic Absorption by Magnetic Oxide Nanomaterials: A Review

“…Meanwhile, Mengmeng Ren et al 89 synthesized carbon nanotube-loaded Fe 3 O 4 composites by chemical vapor deposition and found that the composites had the best wave-absorbing performance when the Fe 3 O 4 content was 42.4%. Jiajia Zheng et al 90 developed cost-effective composites that can absorb electromagnetic waves by adding conductive carbon nanotubes and magnetic Fe 3 O 4 auxiliary composites. When 15 wt %% of paraffin wax was added to the composites, they achieved an absorption bandwidth of 5.5 GHz with a matched thickness of 2.3 mm, and the electromagnetic attenuation (EMA) performance was improved to −60.46 dB at 14.19 GHz.…”

High-rate carbon nanotube/magnetic-sheet composites in situ synthesized using a fluidized bed for high-frequency microwave absorption

“…9,10 Carbon nanotubes have exotic physicochemical properties, 11 such as unique metallic or semiconductor electrical conductivity, 12 high mechanical strength, 13 hydrogen storage capacity, 14 adsorption capacity 15 and strong microwave absorption. [16][17][18] The CNTs were first discovered in the early 1990s, and immediately attracted great attention from the physical, chemical and material science communities. 19 At present, the multi-walled carbon nanotubes (MWCNTs) have cost advantages, and are gradually taking over the market of traditional carbon black as reinforcing agents and conductive agents.…”

High-Performance Microwave Absorption Materials: Theory, Fabrication, and Functionalization

“…The rapid development of 5G communication technology has provided great convenience, but widespread use of this emerging technology is also leading to serious electromagnetic waves pollution. , To avoid the harm of electromagnetic pollution to human health and other electronic equipment, it is urgent to develop various kinds of efficient electromagnetic shielding materials or microwave absorption materials (MAMs). − Compared with the former, the latter can dissipate microwaves by absorption and then converting them into other forms of energy, which effectively reduces the reflection of microwaves and avoids the secondary pollution . Among many fields where MAMs can be applied, military field is still the most important part.…”