壳肱型金属纳米胶囊的制备及性能研究

Synthesis and properties of ＂core/shell＂ type metal nanocapsule composite

利用直流电弧等离子法，制备不同“核／壳”型结构的复合纳米胶囊。首先，对Ni（C）纳米胶囊的微观结构和吸波性能进行研究，发现由于存在合适的电磁匹配，多重极化效应和强的自然共振吸收等现象，样品具有优良的电磁波吸收性能。其次，根据对Co（SiO2）纳米胶囊微观结构和形成机理的分析，在传统的VLS生长机制的基础上，首次提出了“定量氧辅助VLS（SOA-VLS）”理论，该理论对制备不同“核／壳”型纳米胶囊提供了一个新的途径。

The microwave absorption properties and growth mechanism of serials functional ＂core/shell＂ type metal nanocapsules synthesized by the arc-discharge method were investigated. By analyzing microstructure and microwave absorption properties of Ni（C） nanocapsule, we ascribed the excellent microwave absorption properties to a proper electromagnetic match, multi-polarization mechanisms, as well as a strong natural resonance, etc. Based on the unique microstructure and growth mechanism of Co（SiOz） nanocapsule, we proposed a new concept （ SOA-~LS ） to synthesize the ＂core/shell＂ type＇s nanocapsules, extended from the conventional mechanism of the vapor-liquid-solid （VLS）. It opens a new way to synthesize serials of ＂core/shell＂ type nanocomposites.