CoPt nanoparticles by a modified polyol process

Boo Hyun An; Jun Hua Wu; Hong Ling Liu; Seung Pil Ko; Jae Seon Ju; Young Keun Kim

doi:10.1016/j.colsurfa.2007.04.105

CoPt nanoparticles by a modified polyol process

Boo Hyun An, Jun Hua Wu, Hong Ling Liu, Seung Pil Ko, Jae Seon Ju, Young Keun Kim

Department of Materials Science and Engineering

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

17 Citations (Scopus)

Abstract

We synthesized monodisperse CoPt nanoparticles by a modified polyol process, in which Co(acac)₃ and Pt(acac)₂ were co-reduced by a diol in the presence of PVP surfactants at high temperature (acac = acetylacetonate, PVP = polyvinylpyrrolidone). It is found that the CoPt nanoparticles assume a face-centered cubic phase and possess high crystallinity, with a particle size of 5.3 nm and a tight size distribution. The nanoparticles show superparamagnetism in the as-synthesized state and become ferromagnetic after annealing. The magnetization process of the nanoparticles prior to heat treatment was analyzed by the Langevin equation and their effective magnetic particle size was thus obtained, in close approximation to the results from the XRD and TEM observation.

Original language	English
Pages (from-to)	250-253
Number of pages	4
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	313-314
DOIs	https://doi.org/10.1016/j.colsurfa.2007.04.105
Publication status	Published - 2008 Feb 1

Keywords

CoPt
Magnetic
Nanoparticles
Polyol
Surfactant

ASJC Scopus subject areas

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

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10.1016/j.colsurfa.2007.04.105

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title = "CoPt nanoparticles by a modified polyol process",

abstract = "We synthesized monodisperse CoPt nanoparticles by a modified polyol process, in which Co(acac)3 and Pt(acac)2 were co-reduced by a diol in the presence of PVP surfactants at high temperature (acac = acetylacetonate, PVP = polyvinylpyrrolidone). It is found that the CoPt nanoparticles assume a face-centered cubic phase and possess high crystallinity, with a particle size of 5.3 nm and a tight size distribution. The nanoparticles show superparamagnetism in the as-synthesized state and become ferromagnetic after annealing. The magnetization process of the nanoparticles prior to heat treatment was analyzed by the Langevin equation and their effective magnetic particle size was thus obtained, in close approximation to the results from the XRD and TEM observation.",

keywords = "CoPt, Magnetic, Nanoparticles, Polyol, Surfactant",

author = "An, {Boo Hyun} and Wu, {Jun Hua} and Liu, {Hong Ling} and Ko, {Seung Pil} and Ju, {Jae Seon} and Kim, {Young Keun}",

note = "Funding Information: This work was supported by the Korea Research Foundation Grants KRF-2005-210-D00023 and KRF-2004-005-D00057, by the Grant A050750 of the Korea Health 21 R&D Project, Ministry of Health & Welfare, and by the Korea Science and Engineering Foundation through the National Research Laboratory Program funded by the Ministry of Science and Technology (No. M10500000105-05J0000-10510).",

year = "2008",

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doi = "10.1016/j.colsurfa.2007.04.105",

language = "English",

volume = "313-314",

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TY - JOUR

T1 - CoPt nanoparticles by a modified polyol process

AU - An, Boo Hyun

AU - Wu, Jun Hua

AU - Liu, Hong Ling

AU - Ko, Seung Pil

AU - Ju, Jae Seon

AU - Kim, Young Keun

N1 - Funding Information: This work was supported by the Korea Research Foundation Grants KRF-2005-210-D00023 and KRF-2004-005-D00057, by the Grant A050750 of the Korea Health 21 R&D Project, Ministry of Health & Welfare, and by the Korea Science and Engineering Foundation through the National Research Laboratory Program funded by the Ministry of Science and Technology (No. M10500000105-05J0000-10510).

PY - 2008/2/1

Y1 - 2008/2/1

N2 - We synthesized monodisperse CoPt nanoparticles by a modified polyol process, in which Co(acac)3 and Pt(acac)2 were co-reduced by a diol in the presence of PVP surfactants at high temperature (acac = acetylacetonate, PVP = polyvinylpyrrolidone). It is found that the CoPt nanoparticles assume a face-centered cubic phase and possess high crystallinity, with a particle size of 5.3 nm and a tight size distribution. The nanoparticles show superparamagnetism in the as-synthesized state and become ferromagnetic after annealing. The magnetization process of the nanoparticles prior to heat treatment was analyzed by the Langevin equation and their effective magnetic particle size was thus obtained, in close approximation to the results from the XRD and TEM observation.

AB - We synthesized monodisperse CoPt nanoparticles by a modified polyol process, in which Co(acac)3 and Pt(acac)2 were co-reduced by a diol in the presence of PVP surfactants at high temperature (acac = acetylacetonate, PVP = polyvinylpyrrolidone). It is found that the CoPt nanoparticles assume a face-centered cubic phase and possess high crystallinity, with a particle size of 5.3 nm and a tight size distribution. The nanoparticles show superparamagnetism in the as-synthesized state and become ferromagnetic after annealing. The magnetization process of the nanoparticles prior to heat treatment was analyzed by the Langevin equation and their effective magnetic particle size was thus obtained, in close approximation to the results from the XRD and TEM observation.

KW - CoPt

KW - Magnetic

KW - Nanoparticles

KW - Polyol

KW - Surfactant

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U2 - 10.1016/j.colsurfa.2007.04.105

DO - 10.1016/j.colsurfa.2007.04.105

M3 - Article

AN - SCOPUS:37349003079

SN - 0927-7757

VL - 313-314

SP - 250

EP - 253

JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects

JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects

ER -

CoPt nanoparticles by a modified polyol process

Abstract

Keywords

ASJC Scopus subject areas

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