Morphology-Controlled Fabrication Strategy of Hollow Mesoporous Carbon Spheres@f-Fe2O3 for Microwave Absorption and Infrared Stealth

• DOI: 10.1021/acsami.2c08077
• Publication Date: 2022-07-23T13:52:20Z
• Authors: Wenjun Ma; Chuanhao Tang; Peng He; Xiaohan Wu; Zhong-Kai Cui; Shaoliang Lin; Xiaoyun Liu; Qixin Zhuang
• Keywords: Carbon fibers; Morphology

The design and development of radar-–infrared compatible stealth materials are challenging in the field broadband absorption due to contradiction requirements mechanisms different frequency bands. However, hollow structures show great promise for multispectral because they can lengthen attenuation path electromagnetic waves (EMWs) microwave absorption, interrupt continuity heat-transport channels, lower thermal conductivity realize infrared stealth. Here, a new morphological fabrication strategy has been developed efficiently prepare nanomaterials. In specific hydrothermal process, confined growth flake α-Fe2O3 (f-Fe2O3) outside mesoporous carbon spheres (HMCS) is achieved using NH3·H2O as shape-controlled reagent. introduction f-Fe2O3 helps emissivity improve high-frequency impedance matching, which depends on stable dielectric property shape. Moreover, size be regulated by changing constituent proportion suspension obtain excellent performance. minimum reflection loss (RL) HMCS@f-Fe2O3-6 composite −34.16 dB at 2.4 mm, effective bandwidth (EAB) reaches 4.8 GHz. Furthermore, lowest emissivities HMCS@f-Fe2O3-6-20 wt %/polyetherimide (PEI) film 3–5 8–14 μm wavebands 0.212 0.508, respectively. These discoveries may pave way radar–infrared from perspective microstructural design.