Paper Information

Journal:   NANOMATERIALS (JOURNAL OF NANOCOMPOSITE MATERIALS RESEARCH)   FALL 2009 , Volume 1 , Number 3; Page(s) 135 To 142.
 
Paper: 

A STUDY ON THE KINETIC OF THE ELECTRODEPOSITED THIN FILMS OF NANO CRYSTALLINE CO–NI ALLOY SULFATE SOLUTION

 
 
Author(s):  DOULATI A.*, SABABI M., NOURI E., GHORBANI M.
 
* IRAN, TEHRAN, SHARIF UNIVERSITY OF TECHNOLOGY, DEPARTMENT OF MATERIAL SCIENCE AND ENGINEERING
 
Abstract: 
In this research, electrodeposition of nanocrystalline Ni–Co alloys thin films was studied by electrochemical techniques. Cyclic voltammetry and current transient measurements were used to characterize the Co–Ni system in order to obtain the nucleation and growth mechanism. The cyclic voltammetry results clearly showed that electrodeposition of cobalt, nickel and Co–Ni 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 Co–Ni 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 Co–Ni 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 Co–Ni alloy system as layer-by-layer deposition.
 
Keyword(s): MECHANISM, ELECTROCHEMICAL DEPOSITION, CO-NI NANOCRYSTAL, AFM
 
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