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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Synthesis of yolk-shell structured carbonyl iron@void@nitrogen doped carbon for enhanced microwave absorption performance
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Synthesis of yolk-shell structured carbonyl iron@void@nitrogen doped carbon for enhanced microwave absorption performance

机译：Yolk-Shell结构羰基Iron @ Void @氮掺杂碳的合成，用于增强微波吸收性能

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摘要

Although carbonyl iron powders (CIP) have already been used as microwave absorbing material for human health, wireless communication safety and defense stealth technology, it is difficult to implement both thin coating thickness and broadband absorption capability. Herein, core-shell structured CIP@-SiO2@Nitrogen doped carbon (NC) microspheres were fabricated by a two-step process followed by a pyrolysis process and the yolk-shell structured CIP@void@NC microspheres were obtained by alkaline hydrothermal etching. The phase structure, micromorphology, magnetic properties, and electromagnetic parameters of yolk-shell structured CIP@void@NC microspheres were investigated by variously analytical techniques. The yolk-shell structured CIP@void@NC microspheres shown enhanced electromagnetic wave absorption properties both in effective absorption bandwidth (EAB, RL <= -10 dB) and absorption intensity compared with single CIP. The maximum reflection loss value is -25.7 dB at 17.2 GHz and the EAB can reach to 6.9 GHz (11.1-18 GHz) at a coating thickness of 1.7 mm for yolk-shell structured CIP@void@NC microspheres. The results indicated that the yolk-shell structured CIP@void@NC microspheres are expected to be a promising candidate as the high-performance microwave absorbing material. (C) 2019 Published by Elsevier B.V.
机译：虽然羰基粉末（CIP）已被用作人类健康的微波吸收材料，但无线通信安全和防水隐藏技术，但难以实现薄涂层厚度和宽带吸收能力。这里，通过两步法制备热解过程，通过碱性水热蚀刻获得热解过程，通过碱性水热蚀刻获得核 - 壳结构Cip @ -SiO 2掺杂碳（NC）微球。通过碱性水热蚀刻获得yolk-壳结构CIP @ Void @ NC微球。通过各种分析技术研究了yolk-壳结构CIP @ void @ NC微球的相结构，微晶，磁性和电磁参数。与单CIP相比，yolk-shell结构CIP @ void @ NC微球中的有效吸收带宽（EAB，RL <= -10dB）和吸收强度显示出增强的电磁波吸收性能。最大反射损耗值为-25.7 dB，17.2 GHz，EAB可在涂层厚度为1.7 mm的涂层厚度为1.7 mm，用于蛋白质壳体@ NC微球。结果表明，yolk-shell结构化CIP @ void @ NC微球预计将成为高性能微波吸收材料的有希望的候选者。 （c）2019年由elestvier b.v发布。

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