Effects of shell thickness on blocking temperature of nanocomposites of metal particles with gold shells

Author

Carpenter, Everett E. ; Sangregorio, C. ; O´Connor, Charles J.

Author_Institution

Adv. Mater. Res. Inst., New Orleans Univ., LA, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3496

Lastpage

3498

Abstract

Nanoscale iron particles were synthesized in reverse micelles created from aqueous reactants, octane, n-butanol, and cetyltrimethylammonium bromide (CTAB). Using reverse micelles as nano-reactors allows for the sequential synthesis of core-shell nanoparticles. Iron nanoparticles were synthesized and coated with gold. A series of particles with varying gold shell thickness were synthesized to investigate the effect of shell thickness on the magnetic properties of the iron core. Particle sizes were confirmed using XRD and particle uniformity was determined by TEM. Magnetic measurement carried out using a SQUID susceptometer indicated superparamagnetic behavior

Keywords

gold; iron; magnetic particles; nanostructured materials; particle size; superparamagnetism; Fe-Au; aqueous reactants; blocking temperature; cetyltrimethylammonium bromide; core-shell nanoparticles; magnetic properties; metal particles with Au shells; n-butanol; nanocomposites; octane; particle sizes; reverse micelles; shell thickness; superparamagnetic behavior; Gold; Iron; Magnetic cores; Magnetic properties; Magnetic susceptibility; Magnetic variables measurement; Nanoparticles; SQUIDs; Temperature; X-ray scattering;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800568

Filename

800568