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Structure of Self-assembled Magnetic FePtCu Nanoparticles Arrays

Published online by Cambridge University Press:  10 February 2011

Xiangcheng Sun ,
J.W. Harrell ,
D. E. Nikles ,
K. Sun ,
L. M. Wang ,
J. Li  and
Z. L. Wang
Xiangcheng Sun
Affiliation:
Center for Materials for Information Technology (MINT), The University of Alabama, Tuscaloosa AL, 35487-0209 Email: xcsun@bama.ua.edu
J.W. Harrell
Affiliation:
Center for Materials for Information Technology (MINT), The University of Alabama, Tuscaloosa AL, 35487-0209 Email: xcsun@bama.ua.edu
D. E. Nikles
Affiliation:
Center for Materials for Information Technology (MINT), The University of Alabama, Tuscaloosa AL, 35487-0209 Email: xcsun@bama.ua.edu
K. Sun
Affiliation:
Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI, 48109.
L. M. Wang
Affiliation:
Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI, 48109.
J. Li
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30332-0245
Z. L. Wang
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30332-0245
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Abstract

In this study, a series of FexPtyCu100-x-y nanoparticles were chemically synthesized by solution-phase reduction of platinum and copper reagents and thermal decomposition of iron pentacarbonyl in the presence of stabilizers oleic acid and oleyl amine. As-prepared particles had a chemically disordered face-centered cubic (fcc) lattice with an average diameter of 3.5 nm. The particle size, and the corresponding size distribution were controlled by varying the organic surfactant (oleic acids, etc.), its concentration, and the reaction temperature. These particles were well dispersed in hydrocarbon solvents and self-assembled into two or three dimensions particles arrays with a variety of closepacking arrangements. Domain of monolayers, bilayers and multilayers of particles arrays were frequently detected in TEM specimens. Both cubic close-packed (ccp) and honeycomb arrays were also uniquely observed. It was also demonstrated that the controlled organic surfactant layer (organic capping) play a crucial role in determining assembly dimensions and symmetry as well as particle packing arrays.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 775: Symposium P – Self-Assembled Nanostructured Materials , 2003 , P9.8
Copyright
Copyright © Materials Research Society 2003

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