Growth of Pt-Ni Nanoparticles of Different Composition using Electrodeposition and Characterization of Their Magnetic Properties

Abstract

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.

Magnetic Characterization of Electrodeposited Pt1−xNix Alloy Films: Influence of Deposition Potential and the Presence of Boric Acid

“…However, such properties can be of specific interest for temperature sensing, 4 magnetocaloric cooling, 5 heat assisted magnetic recording, and all optical switching of magnetization. 6 The platinum nickel system has been widely studied for its magnetic, 3,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] catalytic, [25][26][27][28][29][30][31][32] and structural [33][34][35][36] properties. The compositions of Pt 1-x Ni x and other platinum alloys can be controlled via the potential at which they are electrodeposited, [37][38][39][40][41][42] and the composition can be used to adjust the Curie temperature.…”