Characterization and Magnetic Properties of Core/Shell Structured Fe/Au Nanoparticles

Sung-Jin Cho; Susan M. Kauzlarich; Justin Olamit; Kai Liu; Fernande Grandjean; Leïla Rebbouh; Gary J. Long

doi:10.1063/1.1676033

Characterization and Magnetic Properties of Core/Shell Structured Fe/Au Nanoparticles

Sung-Jin Cho
, Susan M. Kauzlarich
, Justin Olamit
, Kai Liu
, Fernande Grandjean
, Leïla Rebbouh
, Gary J. Long

Chemistry

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

Abstract

Au-coated Fe nanoparticles have been prepared by using a reverse micelle method through reduction of an aqueous solution. Characterizations have been carried out over time to probe the oxidation of Fe. Immediately after synthesis, the samples exhibit metallic conduction and a negative magnetoresistance, consistent with the presence of α-Fe. The temperature dependence of magnetization displays a maximum at a blocking temperature of around 150 K. After a period of 1 month, the samples exhibit insulating behavior, indicating the oxidation of the Fe core. Mössbauer spectroscopy indicates the presence of an α-Fe component and a broad distribution of local environments.

Original language	American English
Pages (from-to)	6804-6806
Number of pages	3
Journal	Journal of Applied Physics
Volume	95
Issue number	11 II
DOIs	https://doi.org/10.1063/1.1676033
State	Published - Jun 1 2004

Keywords

Metallic Conduction
Nanoparticles
Reverse Micelle Method
Zero-field Cooling (ZFC)
Coercive Force
Giant Magnetoresistance
Hysteresis
Iron
Magnetic Moments
Magnetization
Micelles
Mössbauer Spectroscopy
Oxidation
Reduction
SQUIDs
Superparamagnetism
Synthesis (Chemical)
Transmission Electron Microscopy
Transport Properties
X Ray Diffraction Analysis
Nanostructured Materials

Disciplines

Chemistry

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10.1063/1.1676033License: CC BY

Characterization and Magnetic Properties of Core Shell StructuredFinal published version, 269 KBLicense: CC BY

Cite this

@article{39585a2609624d55bc8b73b35efbaa16,

title = "Characterization and Magnetic Properties of Core/Shell Structured Fe/Au Nanoparticles",

abstract = " Au-coated Fe nanoparticles have been prepared by using a reverse micelle method through reduction of an aqueous solution. Characterizations have been carried out over time to probe the oxidation of Fe. Immediately after synthesis, the samples exhibit metallic conduction and a negative magnetoresistance, consistent with the presence of α-Fe. The temperature dependence of magnetization displays a maximum at a blocking temperature of around 150 K. After a period of 1 month, the samples exhibit insulating behavior, indicating the oxidation of the Fe core. M{\"o}ssbauer spectroscopy indicates the presence of an α-Fe component and a broad distribution of local environments.",

keywords = "Metallic Conduction, Nanoparticles, Reverse Micelle Method, Zero-field Cooling (ZFC), Coercive Force, Giant Magnetoresistance, Hysteresis, Iron, Magnetic Moments, Magnetization, Micelles, M{\"o}ssbauer Spectroscopy, Oxidation, Reduction, SQUIDs, Superparamagnetism, Synthesis (Chemical), Transmission Electron Microscopy, Transport Properties, X Ray Diffraction Analysis, Nanostructured Materials",

author = "Sung-Jin Cho and Kauzlarich, \{Susan M.\} and Justin Olamit and Kai Liu and Fernande Grandjean and Le{\"i}la Rebbouh and Long, \{Gary J.\}",

year = "2004",

month = jun,

day = "1",

doi = "10.1063/1.1676033",

language = "American English",

volume = "95",

pages = "6804--6806",

journal = "Journal of Applied Physics",

issn = "1089-7550",

number = "11 II",

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TY - JOUR

T1 - Characterization and Magnetic Properties of Core/Shell Structured Fe/Au Nanoparticles

AU - Cho, Sung-Jin

AU - Kauzlarich, Susan M.

AU - Olamit, Justin

AU - Liu, Kai

AU - Grandjean, Fernande

AU - Rebbouh, Leïla

AU - Long, Gary J.

PY - 2004/6/1

Y1 - 2004/6/1

N2 - Au-coated Fe nanoparticles have been prepared by using a reverse micelle method through reduction of an aqueous solution. Characterizations have been carried out over time to probe the oxidation of Fe. Immediately after synthesis, the samples exhibit metallic conduction and a negative magnetoresistance, consistent with the presence of α-Fe. The temperature dependence of magnetization displays a maximum at a blocking temperature of around 150 K. After a period of 1 month, the samples exhibit insulating behavior, indicating the oxidation of the Fe core. Mössbauer spectroscopy indicates the presence of an α-Fe component and a broad distribution of local environments.

AB - Au-coated Fe nanoparticles have been prepared by using a reverse micelle method through reduction of an aqueous solution. Characterizations have been carried out over time to probe the oxidation of Fe. Immediately after synthesis, the samples exhibit metallic conduction and a negative magnetoresistance, consistent with the presence of α-Fe. The temperature dependence of magnetization displays a maximum at a blocking temperature of around 150 K. After a period of 1 month, the samples exhibit insulating behavior, indicating the oxidation of the Fe core. Mössbauer spectroscopy indicates the presence of an α-Fe component and a broad distribution of local environments.

KW - Metallic Conduction

KW - Nanoparticles

KW - Reverse Micelle Method

KW - Zero-field Cooling (ZFC)

KW - Coercive Force

KW - Giant Magnetoresistance

KW - Hysteresis

KW - Iron

KW - Magnetic Moments

KW - Magnetization

KW - Micelles

KW - Mössbauer Spectroscopy

KW - Oxidation

KW - Reduction

KW - SQUIDs

KW - Superparamagnetism

KW - Synthesis (Chemical)

KW - Transmission Electron Microscopy

KW - Transport Properties

KW - X Ray Diffraction Analysis

KW - Nanostructured Materials

UR - https://scholarsmine.mst.edu/chem_facwork/2394

U2 - 10.1063/1.1676033

DO - 10.1063/1.1676033

M3 - Article

SN - 1089-7550

VL - 95

SP - 6804

EP - 6806

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 11 II

ER -

Characterization and Magnetic Properties of Core/Shell Structured Fe/Au Nanoparticles

Abstract

Keywords

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