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Water-Dispersible FePt Nanoparticles Having ω-Mercapto-α-carboxylic Acid Ligands

Published online by Cambridge University Press:  01 February 2011

Janis K. Mabry ,
Laura Beth Tackett ,
Hitesh Bargaria ,
Xiangcheng Sun ,
Earl T. Ada ,
Mohammad Shamsuzzoha ,
Kai Sun ,
Lu-min Wang ,
Duane T. Johnson  and
David E. Nikles
Janis K. Mabry
Affiliation:
Department of Chemistry and Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487-0209
Laura Beth Tackett
Affiliation:
Department of Chemistry and Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487-0209
Hitesh Bargaria
Affiliation:
Department of Chemical Engineering and Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487-0209
Xiangcheng Sun
Affiliation:
Department of Chemistry and Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487-0209
Earl T. Ada
Affiliation:
Central Analytical Facility, The University of Alabama, Tuscaloosa, Alabama 35487-0164
Mohammad Shamsuzzoha
Affiliation:
Central Analytical Facility, The University of Alabama, Tuscaloosa, Alabama 35487-0164
Kai Sun
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104
Lu-min Wang
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109-2104
Duane T. Johnson
Affiliation:
Department of Chemical Engineering and Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487-0209
David E. Nikles
Affiliation:
Department of Chemistry and Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, Alabama 35487-0209
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Abstract

FePt nanoparticles, ∼ 2nm in diameter, were prepared by the polyol reduction of platinum(II) acetylacetonate and iron(III) acetylacetonate in the presence of oleyl amine and oleic acid surfactants. The particles were dispersed in hexane and the dispersion added to a solution of 11-mercaptoundecanoic acid in cyclohexanone. As the 11-mercaptoundecanoic acid ligands replaced the oleic acid ligands, the particles precipitated. The particles could be dispersed in basic water, made basic either with sodium hydroxide or ammonium hydroxide. X-ray photoelectron spectra showed a peak near 164 eV, sulfur (2p) confirming the presence of the thiol ligand. Similarly, the oleic acid ligands were replaced with either 3-mercaptopropionic acid or 16-mercaptohexadecanoic acid to give FePt particles that could be dispersed in water. Dispersions made with FePt nanoparticles having 11-mercaptoundeacnoic acid ligands and ammonium counter ions were dried on TEM grids to give highly ordered films consisting of close-packed arrays of FePt nanoparticles. When the counter ion was sodium, the particles tended to aggregate, instead of forming ordered arrays.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 853: Symposium I – Fabrication and New Applications of Nanomagnetic Structures , 2004 , I4.5
Copyright
Copyright © Materials Research Society 2005

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References

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