Monodisperse Fe3O4/Fe@SiO2 core/shell nanoparticles with enhanced magnetic property

Shao Long Tie; Hyeon Cheol Lee; Youn Sang Bae; Min Bae Kim; Kangtaek Lee; Chang Ha Lee

doi:10.1016/j.colsurfa.2006.07.044

Monodisperse Fe₃O₄/Fe@SiO₂ core/shell nanoparticles with enhanced magnetic property

Shao Long Tie, Hyeon Cheol Lee, Youn Sang Bae, Min Bae Kim, Kangtaek Lee, Chang Ha Lee

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

55 Citations (Scopus)

Abstract

Core/shell type nanoparticles with an average diameter of 11 nm were synthesized by coating Fe₃O₄ core in an alkyl alcohol (octanol) with amorphous silica shell. The synthesized nanoparticles were calcined under various conditions to produce different types of core/shell particles. The particles were characterized by using various experimental techniques such as transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and vibration sample magnetometer (VSM). The results suggest that the composition of the three samples (uncalcined, calcined at 200-600 °C for 5 h and 15 h) are Ox-Fe₃O₄@SiO₂, Fe₃O₄/Fe@SiO₂ and γ-Fe₂O₃/Fe@SiO₂, respectively. The saturation magnetization of the particles calcined for 5 h was found to be higher than those of the other particles. It is noted that the formation of metal iron inside the particles during calcination is responsible for the enhanced magnetic property.

Original language	English
Pages (from-to)	278-285
Number of pages	8
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	293
Issue number	1-3
DOIs	https://doi.org/10.1016/j.colsurfa.2006.07.044
Publication status	Published - 2007 Feb 1

Bibliographical note

Funding Information:
Financial supports from the Korean Ministry of Environment as “The Eco-technopia 21 Project” and the Natural Science Foundation of Guangdong Province, China (Contract No. 031505) are gratefully acknowledged.

All Science Journal Classification (ASJC) codes

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

Access to Document

10.1016/j.colsurfa.2006.07.044

Cite this

@article{78413569864c4ab99707d84f900da465,

title = "Monodisperse Fe3O4/Fe@SiO2 core/shell nanoparticles with enhanced magnetic property",

abstract = "Core/shell type nanoparticles with an average diameter of 11 nm were synthesized by coating Fe3O4 core in an alkyl alcohol (octanol) with amorphous silica shell. The synthesized nanoparticles were calcined under various conditions to produce different types of core/shell particles. The particles were characterized by using various experimental techniques such as transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and vibration sample magnetometer (VSM). The results suggest that the composition of the three samples (uncalcined, calcined at 200-600 °C for 5 h and 15 h) are Ox-Fe3O4@SiO2, Fe3O4/Fe@SiO2 and γ-Fe2O3/Fe@SiO2, respectively. The saturation magnetization of the particles calcined for 5 h was found to be higher than those of the other particles. It is noted that the formation of metal iron inside the particles during calcination is responsible for the enhanced magnetic property.",

author = "Tie, {Shao Long} and Lee, {Hyeon Cheol} and Bae, {Youn Sang} and Kim, {Min Bae} and Kangtaek Lee and Lee, {Chang Ha}",

note = "Funding Information: Financial supports from the Korean Ministry of Environment as “The Eco-technopia 21 Project” and the Natural Science Foundation of Guangdong Province, China (Contract No. 031505) are gratefully acknowledged.",

year = "2007",

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doi = "10.1016/j.colsurfa.2006.07.044",

language = "English",

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T1 - Monodisperse Fe3O4/Fe@SiO2 core/shell nanoparticles with enhanced magnetic property

AU - Tie, Shao Long

AU - Lee, Hyeon Cheol

AU - Bae, Youn Sang

AU - Kim, Min Bae

AU - Lee, Kangtaek

AU - Lee, Chang Ha

N1 - Funding Information: Financial supports from the Korean Ministry of Environment as “The Eco-technopia 21 Project” and the Natural Science Foundation of Guangdong Province, China (Contract No. 031505) are gratefully acknowledged.

PY - 2007/2/1

Y1 - 2007/2/1

N2 - Core/shell type nanoparticles with an average diameter of 11 nm were synthesized by coating Fe3O4 core in an alkyl alcohol (octanol) with amorphous silica shell. The synthesized nanoparticles were calcined under various conditions to produce different types of core/shell particles. The particles were characterized by using various experimental techniques such as transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and vibration sample magnetometer (VSM). The results suggest that the composition of the three samples (uncalcined, calcined at 200-600 °C for 5 h and 15 h) are Ox-Fe3O4@SiO2, Fe3O4/Fe@SiO2 and γ-Fe2O3/Fe@SiO2, respectively. The saturation magnetization of the particles calcined for 5 h was found to be higher than those of the other particles. It is noted that the formation of metal iron inside the particles during calcination is responsible for the enhanced magnetic property.

AB - Core/shell type nanoparticles with an average diameter of 11 nm were synthesized by coating Fe3O4 core in an alkyl alcohol (octanol) with amorphous silica shell. The synthesized nanoparticles were calcined under various conditions to produce different types of core/shell particles. The particles were characterized by using various experimental techniques such as transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray spectrometry (EDS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and vibration sample magnetometer (VSM). The results suggest that the composition of the three samples (uncalcined, calcined at 200-600 °C for 5 h and 15 h) are Ox-Fe3O4@SiO2, Fe3O4/Fe@SiO2 and γ-Fe2O3/Fe@SiO2, respectively. The saturation magnetization of the particles calcined for 5 h was found to be higher than those of the other particles. It is noted that the formation of metal iron inside the particles during calcination is responsible for the enhanced magnetic property.

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