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Hydrophilic Co–Pt Alloy Nanoparticles: Synthesis, Characterization, and Perspectives

Published online by Cambridge University Press:  03 March 2011

Athanasios B. Bourlinos ,
Ioannis Panagiotopoulos ,
Dimitrios Niarchos  and
Dimitrios Petridis
Athanasios B. Bourlinos
Affiliation:
Institute of Materials Science, NCSR “Demokritos,” Athens 15310, Greece
Ioannis Panagiotopoulos
Affiliation:
Institute of Materials Science, NCSR “Demokritos,” Athens 15310, Greece
Dimitrios Niarchos
Affiliation:
Institute of Materials Science, NCSR “Demokritos,” Athens 15310, Greece
Dimitrios Petridis*
Affiliation:
Institute of Materials Science, NCSR “Demokritos,” Athens 15310, Greece
*
a)Address all correspondence to this author. e-mail: dpetrid@ims.demokritos.gr
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Abstract

Hydrophilic Co–Pt alloy nanoparticles nearing the equiatomic ratio and dispersedin water-soluble sodium carboxymethyl cellulose were synthesized by the aqueous reduction of CoCl2⋅6H2O and [Pt(NH3)4]Cl2⋅H2O with NaBH4 in presence of the cellulosic derivative. The as-received Co–Pt nanoparticles in the cellulosic matrix possess a disordered fcc structure that, upon calcination under an Ar atmosphereand carbonization of the cellulosic mantle of the particles, transformed to an ordered fcc phase. Both as-synthesized and calcined samples are magnetically soft at room temperature and exhibit a strong magnetic response when a magnetic field is applied. On account of the chemical composition of the carboxymethyl cellulose, the coated Co–Pt nanoparticles are easily soluble in water in high concentrations and exhibit interesting ion-exchange properties.

Keywords

Intermetallic alloysNanoparticles
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 4 , April 2004 , pp. 1227 - 1233
Copyright
Copyright © Materials Research Society 2004

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