Synthesis of monodisperse Fe@SiO 2 core-shell nanocapsules and investigation of their magnetic behaviour

Micro & nano letters

article

Wen Zeng¹  Qiqi Yang¹  Bin Shao¹  Donglin Guo¹  Chunhong Li¹  Yilong Ma¹  Xueguo Yin¹  Sibo Zhao¹  Kejian Li¹ 

[1] School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology

关键词: iron;    particle size;    nanoparticles;    silicon compounds;    coercive force;    scanning electron microscopy;    nanofabrication;    magnetic particles;    X-ray diffraction;    transmission electron microscopy;    heat treatment;    liquid phase deposition;    core-shell nanostructures;    nanomagnetics;    transmission electron microscopy;    monodisperse core-shell nanocapsules;    hydrothermal reaction;    heat treatment;    nanostructures;    X-ray diffraction;    scanning electron microscopy;    magnetic property measurement system;    silica thickness;    tetraethyl orthosilicate;    TEOS;    reaction temperature;    mean particle size;    saturation magnetisation;    coercivity;    particle length;    size 25.0 nm to 35.0 nm;    size 10 nm to 20 nm;    Fe-SiO2;   

DOI  :  10.1049/mnl.2019.0063

学科分类：计算机科学（综合）

来源: Wiley

【 摘 要 】

The monodisperse Fe@SiO 2 core-shell nanocapsules were synthesised via hydrothermal reaction followed with heat treatment. Nanostructures were characterised by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The magnetic properties of Fe@SiO 2 nanocapsules were evaluated with magnetic property measurement system. The results show that Fe@SiO 2 core-shell nanocapsules are highly monodispersed. The silica thickness of Fe@SiO 2 nanocapsules increased from 10–20 to 25–35 nm with increasing tetraethyl orthosilicate (TEOS) amount. In the Fe@SiO 2 nanocapsules prepared with 900 μl TEOS, as the reaction temperature increases, the mean particle size of Fe@SiO 2 nanocapsules increases from 328 to 546 nm. It is remarkable that the saturation magnetisation of Fe@SiO 2 nanocapsules decreases with increasing silica thickness. However, the coercivity of nanocapsules has less influence with the variation of silica thickness and particles’ length.

【 授权许可】

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