Open AccessSynthesis of monodisperse Fe@SiO 2 core‐shell nanocapsules and investigation of their magnetic behaviour
Author(s) -
Zeng Wen,
Yang Qiqi,
Shao Bin,
Guo Donglin,
Li Chunhong,
Ma Yilong,
Yin Xueguo,
Zhao Sibo,
Li Kejian
Publication year - 2019
Publication title -
micro and nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.25
H-Index - 31
ISSN - 1750-0443
DOI - 10.1049/mnl.2019.0063
Subject(s) - nanocapsules , tetraethyl orthosilicate , materials science , dispersity , coercivity , transmission electron microscopy , chemical engineering , scanning electron microscope , nanoparticle , nanotechnology , particle size , composite material , polymer chemistry , physics , condensed matter physics , engineering
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.