文献类型：期刊文献

英文题名：Microwave absorption of carbonization temperature-dependent uniform yolk-shell H-Fe3O4@C microspheres

作者：Ma, Wenjun[1];He, Peng[1];Wang, Tianyi[1];Xu, Jian[1];Liu, Xiaoyun[1];Zhuang, Qixin[1];Cui, Zhong-Kai[2];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Adv Polymer Mat Shanghai, Shanghai 200237, Peoples R China;[2]Southern Med Univ, Sch Basic Med Sci, Guangzhou 510515, Peoples R China

年份：2021

卷号：420

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20212310455883);WOS:【SCI-EXPANDED(收录号:WOS:000664246300003)】；

基金：This work was supported by the National Natural Science Foundation of China (51773060, 52073091, 51573045) ; and Key Laboratory of Advanced Polymer Materials of Shanghai.

语种：英文

外文关键词：Yolk-shell; Carbonization temperature; Graphitization degree; Microwave absorption

摘要：Carbon electromagnetic wave (EMW) absorbing materials are often limited in performance improvement due to their excessive conductivity and single loss mechanism. And the introduction of magnetic components with rational construction of microstructure is evolved as an effective approach to reinforcing the electromagnetic properties of carbon-based microwave absorbers. For the first time, a double-cavity yolk-shell hollow Fe3O4@C (H-Fe3O4@C) microwave absorber is fabricated via a "coating-coating-etching" method, by controlled high-temperature carbonization. The resultant carbon shell is actually composed of different contents of amorphous carbon and graphite, which has a powerful influence on the graphitization degree. When H-Fe3O4@C microspheres are carbonized at 650 degrees C, the optimized reflection loss (RL) has reached -58.44 dB and the effective bandwidth is 6.0 GHz (12.0-18.0 GHz) covering the whole Ku band with the thickness of merely 1.9 mm (filler loading: 30 wt%), which is better than most carbon-based absorbing materials reported yet. The outstanding EMW absorbing properties are ascribed to the multiple reflections and scattering arising from the designed double-cavity yolk-shell structure, the multi-interface polarization between Fe3O4/air and C/air, and the good impedance matching relating to the proper carbonization degree of carbon component at 650 degrees C.