Oxidation effect in cobalt nanoparticles magnetic fluids

Jong Soo Hong; Jeffrey Pyun; Yong Wook Park; Chul Sung Kim; In Bo Shim

doi:10.1109/TMAG.2009.2018613

Oxidation effect in cobalt nanoparticles magnetic fluids

Jong Soo Hong, Jeffrey Pyun, Yong Wook Park, Chul Sung Kim, In Bo Shim

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

10 Scopus citations

Abstract

Cobalt nanoparticles were synthesized by modified thermal decomposition and oxidized in the condition of solution. Crystal structure of fabricated cobalt nanoparticles is determined to be cubic of Fm-3m space group from X-ray diffraction (XRD) measurement. Microstructure of cobalt nanoparticles after the oxidation process show core-shell structure. The particle size and thickness of oxide shell can be controlled by oxidation temperature. The shell thickness of cobalt nanoparticles after the oxidation at 300° C is 4.7 nm, when compared to those oxidized at 250° C with the shell thickness of 2.4 nm due to the change in the oxidation temperature. The magnetic properties of cobalt particles have been measured with VSM. Our results show that cobalt metal (core)/cobalt oxide (shell) has two magnetic behaviors of ferromagnetic and antiferromagnetic properties in magnetic fluid.

Original language	English (US)
Article number	4957721
Pages (from-to)	2464-2466
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	45
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2009.2018613
State	Published - Jun 2009

Keywords

Cobalt nanoparticles
Core-shell structure
Magnetic fluid
Oxidation process

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2009.2018613

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title = "Oxidation effect in cobalt nanoparticles magnetic fluids",

abstract = "Cobalt nanoparticles were synthesized by modified thermal decomposition and oxidized in the condition of solution. Crystal structure of fabricated cobalt nanoparticles is determined to be cubic of Fm-3m space group from X-ray diffraction (XRD) measurement. Microstructure of cobalt nanoparticles after the oxidation process show core-shell structure. The particle size and thickness of oxide shell can be controlled by oxidation temperature. The shell thickness of cobalt nanoparticles after the oxidation at 300° C is 4.7 nm, when compared to those oxidized at 250° C with the shell thickness of 2.4 nm due to the change in the oxidation temperature. The magnetic properties of cobalt particles have been measured with VSM. Our results show that cobalt metal (core)/cobalt oxide (shell) has two magnetic behaviors of ferromagnetic and antiferromagnetic properties in magnetic fluid.",

keywords = "Cobalt nanoparticles, Core-shell structure, Magnetic fluid, Oxidation process",

author = "Hong, {Jong Soo} and Jeffrey Pyun and Park, {Yong Wook} and Kim, {Chul Sung} and Shim, {In Bo}",

note = "Funding Information: This work was supported in part by the Korea Science and Engineering Foundation (KOSEF) Grant by the Korea government (MEST) R11-2005-048-04002-0 and in part by research program 2008 of Kookmin University in Korea.",

year = "2009",

month = jun,

doi = "10.1109/TMAG.2009.2018613",

language = "English (US)",

volume = "45",

pages = "2464--2466",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "6",

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TY - JOUR

T1 - Oxidation effect in cobalt nanoparticles magnetic fluids

AU - Hong, Jong Soo

AU - Pyun, Jeffrey

AU - Park, Yong Wook

AU - Kim, Chul Sung

AU - Shim, In Bo

N1 - Funding Information: This work was supported in part by the Korea Science and Engineering Foundation (KOSEF) Grant by the Korea government (MEST) R11-2005-048-04002-0 and in part by research program 2008 of Kookmin University in Korea.

PY - 2009/6

Y1 - 2009/6

N2 - Cobalt nanoparticles were synthesized by modified thermal decomposition and oxidized in the condition of solution. Crystal structure of fabricated cobalt nanoparticles is determined to be cubic of Fm-3m space group from X-ray diffraction (XRD) measurement. Microstructure of cobalt nanoparticles after the oxidation process show core-shell structure. The particle size and thickness of oxide shell can be controlled by oxidation temperature. The shell thickness of cobalt nanoparticles after the oxidation at 300° C is 4.7 nm, when compared to those oxidized at 250° C with the shell thickness of 2.4 nm due to the change in the oxidation temperature. The magnetic properties of cobalt particles have been measured with VSM. Our results show that cobalt metal (core)/cobalt oxide (shell) has two magnetic behaviors of ferromagnetic and antiferromagnetic properties in magnetic fluid.

AB - Cobalt nanoparticles were synthesized by modified thermal decomposition and oxidized in the condition of solution. Crystal structure of fabricated cobalt nanoparticles is determined to be cubic of Fm-3m space group from X-ray diffraction (XRD) measurement. Microstructure of cobalt nanoparticles after the oxidation process show core-shell structure. The particle size and thickness of oxide shell can be controlled by oxidation temperature. The shell thickness of cobalt nanoparticles after the oxidation at 300° C is 4.7 nm, when compared to those oxidized at 250° C with the shell thickness of 2.4 nm due to the change in the oxidation temperature. The magnetic properties of cobalt particles have been measured with VSM. Our results show that cobalt metal (core)/cobalt oxide (shell) has two magnetic behaviors of ferromagnetic and antiferromagnetic properties in magnetic fluid.

KW - Cobalt nanoparticles

KW - Core-shell structure

KW - Magnetic fluid

KW - Oxidation process

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U2 - 10.1109/TMAG.2009.2018613

DO - 10.1109/TMAG.2009.2018613

M3 - Article

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SN - 0018-9464

VL - 45

SP - 2464

EP - 2466

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 6

M1 - 4957721

ER -

Oxidation effect in cobalt nanoparticles magnetic fluids

Abstract

Keywords

ASJC Scopus subject areas

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