Growth of Pt-Ni Nanoparticles of Different Composition using Electrodeposition and Characterization of Their Magnetic Properties
M. Kožejová a, D. Hložnáa, Y. Hua Liu b, K. Ráczová a, E. Čižmár a, M. Orendáč a and V. Komanický a
aInstitute of Physics, Faculty of Sciences, P.J. Safarik University, Park Angelinum 9, 041 54 Košice, Slovakia
bMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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We prepared Pt3Ni and PtNi3 nanoparticles of various sizes on conductive and atomically smooth highly oriented pyrolytic graphite surfaces using potentiostatic electrodeposition. We can control the size of electrodeposited nanoparticles and their density on the surface by changing the deposition time. The morphology of nanoparticles was determined by scanning electron microscopy. PtNi3 particles have spherical shape, while Pt3Ni particles have more irregular shape. Composition of particles was confirmed by energy dispersive spectroscopy. We have measured magnetic properties of both systems with 100 s preparation time, superparamagnetic behavior was observed in PtNi3 nanoparticles with blocking temperature TB = 225 K.

DOI: 10.12693/APhysPolA.131.839
PACS numbers: 75.75.+a, 75.75.Fk, 82.45.Qr, 68.37.Hk