access icon free Synthesis of monodisperse Fe@SiO2 core-shell nanocapsules and investigation of their magnetic behaviour

© The Institution of Engineering and Technology
Received 24/01/2019, Accepted 17/04/2019, Revised 22/03/2019, Published 14/08/2019

The monodisperse Fe@SiO2 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@SiO2 nanocapsules were evaluated with magnetic property measurement system. The results show that Fe@SiO2 core-shell nanocapsules are highly monodispersed. The silica thickness of Fe@SiO2 nanocapsules increased from 10–20 to 25–35 nm with increasing tetraethyl orthosilicate (TEOS) amount. In the Fe@SiO2 nanocapsules prepared with 900 μl TEOS, as the reaction temperature increases, the mean particle size of Fe@SiO2 nanocapsules increases from 328 to 546 nm. It is remarkable that the saturation magnetisation of Fe@SiO2 nanocapsules decreases with increasing silica thickness. However, the coercivity of nanocapsules has less influence with the variation of silica thickness and particles’ length.

Inspec keywords: liquid phase deposition; heat treatment; iron; X-ray diffraction; core-shell nanostructures; transmission electron microscopy; coercive force; silicon compounds; nanofabrication; nanoparticles; particle size; nanomagnetics; scanning electron microscopy; magnetic particles

Other keywords: X-ray diffraction; tetraethyl orthosilicate; nanostructures; TEOS; coercivity; scanning electron microscopy; saturation magnetisation; hydrothermal reaction; mean particle size; reaction temperature; silica thickness; magnetic property measurement system; size 10 nm to 20 nm; particle length; size 25.0 nm to 35.0 nm; heat treatment; Fe-SiO2; transmission electron microscopy; monodisperse core-shell nanocapsules

Subjects: Amorphous and nanostructured magnetic materials; Deposition from liquid phases (melts and solutions); Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Low-dimensional structures: growth, structure and nonelectronic properties; Magnetization curves, hysteresis, Barkhausen and related effects; Magnetic properties of nanostructures; Nanofabrication using thin film deposition methods; Fine-particle magnetic systems; Other heat and thermomechanical treatments

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2019.0063
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