文章信息/Info

Title:

Microwave Absorption Properties of Carbon-coated Metalic Nanocapsules with Core/shell Structures

作者:

吳念獨; 劉先國

（安徽工業大學 材料科學與工程學院

Author(s):

WU Niandu;  LIU Xianguo

(School of Materials Science and Engineering, Anhui University of Technology,

關鍵詞:

核/殼結構;  納米膠囊;  微波吸收性能; 電磁特性

DOI:

10.7502/j.issn.1674-3962.2016.12.03

文獻標志碼:

A

摘要:

具有核/殼結構的碳包覆金屬納米膠囊由于可調節的成分與結構特征，可以實現微波頻段內相互協調的磁損耗和介電損耗特性，從而獲得優秀的微波吸收性能，在近年來受到大量研究者的廣泛關注。碳外殼的包覆不僅改善了納米材料的物理和化學性質，由此引入的核/殼異質界面還在微觀結構上賦予納米膠囊新的微波吸收機制，建立起了合適的電磁匹配。本文首先介紹了通過直流電弧放電制備碳包覆金屬納米膠囊的方法，簡要分析了該方法中納米膠囊的形成機制。介紹了一些關于碳包覆納米膠囊的結構設計及其在微波吸收材料方面的應用探索，包括不同核殼尺寸結構的設計、引入異質原子等不同方法對納米膠囊在微波頻段內的介電損耗和磁損耗能力的調控，有效提高對樣品微波吸收性能的調控能力。

Abstract:

Carbon-coated metallic nanocapsules have attracted much attention due to their tunable core/shell structure and complementary magnetic- and dielectric-loss properties which can lead to optimal microwave absorption properties. The carbon shells can not only improve physical and chemical properties of nanomaterials but also result in some new mechanisms that are contributing to electromagnetic impedance matching. In this paper, we described core/shell-type carbon-coated nanocapsules using a DC arc discharge approach and analyzed their formation mechanism. The architectural design of nanocapsules applied for microwave absorbing materials was introduced and reviewed, including research on nanocapsules with different core or shell dimensions and doped by some kinds of heteroatoms which are significant to adjust the dielectric and magnetic losses and the microwave properties of absorbers.