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Published on: May 22, 2020
Thermal-Driven Structure-Phase Cooperative Evolution of Magnetic Micro-Flower on Biomass-Derived Carbon for
Yunfeng Bao1, Yu Liu1, Wenrui Wang1
1School of Civil Engineering, Qingdao University of Technology, Qingdao, 266520, China.
Abstract:
The collaborative design of structure-phase evolution represents a promising strategy for constructing high-performance electromagnetic wave absorption (EMA) materials. Nevertheless, challenges remain in realizing customized EMA performance and deeper loss mechanism analysis. Here, through gradient temperature pyrolysis, NiFe layered double hydroxide (NiFe-LDH) micro-flower undergoes dynamic structure-phase cooperative evolution on the biomass-derived carbon (BC) layer, triggering vacancies, defects, and magnetic media to enhance multi-polarization relaxation and gradient magnetic coupling effects. The multiphase coexisting NiO/NiFe2O4/Ni/Ni3Fe@BC (S700) exhibits customized dual-band EMA properties, integrating the EMA characteristics of both metal oxides and alloys, which owns the minimum reflection loss (RL) of -67.44 dB at 2.773 mm (C band) and the RL of -60.3 dB at only 1.754 mm with the wide effective absorption bandwidth (EAB) of 6.7 GHz (Ku band). Additionally, radar cross-section (RCS) simulations display that S700 owns exceptional omnidirectional radar stealth capacity. The minimum RCS value can reach -45.99 dB m2 at the plane wave angle of 60°. And the prepared S700/acrylic resin shows good infrared stealth performance. This pioneering work provides valuable insights for the rational design and development of EMA materials with compatible radar-infrared stealth ability.
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