Title of article :
CoPt nanoparticles by a modified polyol process
Author/Authors :
An، نويسنده , , Boo Hyun and Wu، نويسنده , , Jun-Hua and Liu، نويسنده , , Hong Ling and Ko، نويسنده , , Seung Pil and Ju، نويسنده , , Jae-Seon and Kim، نويسنده , , Young Keun، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2008
Abstract :
We synthesized monodisperse CoPt nanoparticles by a modified polyol process, in which Co(acac)3 and Pt(acac)2 were co-reduced by a diol in the presence of PVP surfactants at high temperature (acac = acetylacetonate, PVP = polyvinylpyrrolidone). It is found that the CoPt nanoparticles assume a face-centered cubic phase and possess high crystallinity, with a particle size of 5.3 nm and a tight size distribution. The nanoparticles show superparamagnetism in the as-synthesized state and become ferromagnetic after annealing. The magnetization process of the nanoparticles prior to heat treatment was analyzed by the Langevin equation and their effective magnetic particle size was thus obtained, in close approximation to the results from the XRD and TEM observation.
Keywords :
MAGNETIC , Polyol , CoPt , surfactant , Nanoparticles
Journal title :
Colloids and Surfaces A Physicochemical and Engineering Aspects
Journal title :
Colloids and Surfaces A Physicochemical and Engineering Aspects