文献类型：期刊文献

英文题名：Hierarchical Multi-Core-Shell CoNi@Graphite Carbon@Carbon Nanoboxes for Highly Efficient Broadband Microwave Absorption

作者：Wu, Xiaohan[1];Ma, Wenjun[1];Xu, Jian[1];He, Peng[1];Du, Yiqian[1];Zhang, Yantai[1];Zuo, Peiyuan[1];Qi, Huimin[1];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Minist Educ, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：5

期号：5

起止页码：7300

外文期刊名：ACS APPLIED NANO MATERIALS

收录：;EI(收录号：20222012119782);WOS:【SCI-EXPANDED(收录号:WOS:000821379900001)】；

基金：This work was supported by the National Natural Science Foundation of China (52073091 and 22171086) and the Natural Science Foundation of Shanghai (20ZR1414600).

语种：英文

外文关键词：microwave absorption; multi-core-shell structure; graphite carbon; CoNi alloy; Prussian blue analogues

摘要：The rational construction of a core-shell structure has been widely used in the design of absorbing materials for improved impedance and attenuation matching. However, for traditional absorbing core-shell materials, it is crucial to further regulate the morphology and composition of the core after encapsulation, to realize further improvement in absorbing performance. In this work, heterogeneous multi-core-shell CoNi@graphite carbon@carbon (hereinafter referred to as CGC) nanocomposites have been fabricated via the polymerization of dopamine on the surface of cobalt-nickel Prussian blue analogues and subsequent carbonization. Because of the effect of metal catalytic graphitization, the CoNi alloy formed during high-temperature carbonization promotes the transitional process from amorphous carbon to graphite, thus forming a multi-core-shell structure with the CoNi alloy coated with graphite carbon as the core and amorphous carbon as the shell. Notably, the as-prepared CGC nanocomposites with an optimized paraffin loading ratio exhibit superior electromagnetic wave (EMW) absorbing capacity, reaching a minimum reflection loss value of -56.78 dB at 14.76 GHz with a thickness of 2.0 mm, much better than that of most magnetic carbon-based absorbing materials as reported previously. Furthermore, the effective bandwidth goes across 5.51 dB (12.34-17.85 GHz), therefore enriching the absorbing application in the Ku band. As a result, the superior impedance and attenuation matching derived from the heterogeneous multi-core-shell structure and multiple electromagnetic loss components make CGC a promising EMW absorbing material.