A Study on the Kinetic of the Electrodeposited Thin Films of Nano Crystalline Co Ni Alloy Sulfate Solution
Author(s):
Abstract:
In this research, electrodeposition of nanocrystalline NiCo alloys thin films was studied by electrochemical techniques. Cyclic voltammetry and current transient measurements were used to characterize the CoNi system in order to obtain the nucleation and growth mechanism. The cyclic voltammetry results clearly showed that electrodeposition of cobalt, nickel and CoNi alloy is diffusion-controlled process with a typical nucleation mechanism. The redox potentials of the Co and Ni are shifted to more cathodic potentials in the CoNi alloy system. In addition, the current transients revealed that nucleation mechanism is instantaneous with a typical three dimensional (3D) nucleation and growth process. The number of nucleation sites is increased with the overpotential and nickel or cobalt concentration. It was found that addition of nickel sulfate to cobalt solution, resulted in increasing the number of nucleation sites and therefore the nucleation rate of the CoNi alloy system is increased. However, AFM analysis showed that alloying cobalt thin films with nickel changed the microstructure. In this condition, a large number of equally sized spherical grains are observed in single cobalt deposits, while the rectangular particles are deposited in the CoNi alloy system as layer-by-layer deposition.
Keywords:
Language:
Persian
Published:
Journal of Nano Materials, Volume:1 Issue: 3, 2009
Pages:
135 to 142
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