文献类型：期刊文献

英文题名：Controlled-etching assisted fabrication of yolk-shell Co/C nanocubes with dual loss mechanisms to improve electromagnetic wave absorption abilities

作者：Wang, Yizhe[1,2];Xu, Jian[1];He, Peng[1];Ma, Wenjun[1];Liu, Xiaoyun[1];Qian, Jun[1];Zuo, Peiyuan[1];Zeng, Jinjin[3];Zhuang, Qixin[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China;[2]Qinghai Univ, State Key Lab Plateau Ecol & Agr, Xining 810016, Qinghai, Peoples R China;[3]Shanghai Composites Sci & Technol Co Ltd, Shanghai 201112, Peoples R China

年份：2023

卷号：952

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20231513873212);WOS:【SCI-EXPANDED(收录号:WOS:000982296100001)】；

基金：Acknowledgements This work was supported by the National Natural Science Foundation of China (52073091, 22171086) , Shanghai Pujiang Program (22PJ1402500) , Natural Science Foundation of Shanghai (20ZR1414600) and the Fundamental Research Funds for the Central Universities (JKD01221701) .

语种：英文

外文关键词：Yolk-shell; Controlled-etching; Two types of losses; Electromagnetic wave absorption

摘要：Rational design and fabrication of yolk-shell structure is evolving as an effective approach to improve electromagnetic wave absorption performance by enhancing the impedance matching, multiple reflections and scatterings, as well as promoting interfacial polarizations. However, due to the complexity of synthesis, it is still challenging to develop an absorber with yolk-shell structures intergrating two types of losses (dielectric and magnetic loss) simultaneously in the yolk and shell. Herein, novel yolk-shell Co/C nanocubes were successfully constructed via a controlled-etching with tannic acid followed by direct pyrolysis, in which the magnetic component Co and dielectric component C were uniformly distributed in the yolk as well as the shell. It was found that the pyrolysis temperature can adjust the graphitization degree of carbon and the crystallinity of metal Co, which effectively regulated the electromagnetic properties of the YS-Co/C nanocubes. The reflection loss was - 57.34 dB by increasing the pyrolysis temperature to 700 celcius under a frequency of 11.76 GHz. The corresponding effective absorption bandwidth was 5.6 GHz (9.52-15.12 GHz) at a thickness of only 2.5 mm. The findings obtained from this study lay a solid foundation for novel design of yolk-shell absorbers applied in EMW absorption.(c) 2023 Published by Elsevier B.V.