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Hierarchically Porous Carbon/α‐Fe@Fe 3 C Absorbers Derived from Luffa Sponge with Efficient Microwave Absorption
Author(s) -
Zheng Qi,
Yu Meijie,
Wang Wen,
Liu Siyu,
Liang Xuechen,
Wang Chengguo,
Dai YouYong,
Gao Xueping
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004281
Subject(s) - materials science , reflection loss , microwave , absorption (acoustics) , carbon fibers , porosity , calcination , composite material , mesoporous material , dielectric loss , nanometre , dielectric , nanotechnology , chemical engineering , composite number , optoelectronics , chemistry , biochemistry , physics , quantum mechanics , catalysis , engineering
Biomass‐based carbon materials have attracted much attention in the field of microwave absorption because of their light weight, environmental friendliness, low cost and high efficiency. In this work, carbon matrix of porous microtubule structure with different magnetic particles was synthesized from natural luffa sponge by a simple calcination process. The carbon matrix possesses hierarchical porous structures including micrometer‐scale tubular channels, nanometer‐scale macrospores, mesopores and micropores, of which microspores are the most. The Fe 3 O 4 , FeO/α‐Fe, α‐Fe/γ‐Fe and α‐Fe/Fe 3 C particles were formed in the temperature range of 700–1000 °C. The porous carbon/α‐Fe@Fe 3 C composites obtained at 1000 °C exhibit excellent microwave absorption (MA) performance, its minimum reflection loss can reach −48.9 dB with only a thickness of 1.5 mm, and the effective absorption bandwidth (RL≤−10 dB) is 3.86 GHz. The porous structure, synergies between dielectric loss and magnetic loss, high attenuation constant are the key factors for good MA performance.