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Electrochemical Copper Deposition from an Ethaline-CuCl_2^.2H₂O DES

Lookup NU author(s): swati Ghosh, Professor Sudipta Roy

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Abstract

Cu electroplating was carried out using a pure ethaline melt, a 1:2 ratio of choline chloride and ethylene glycol, at room temperature by potentiostatic and galvanostatic methods. Hydrated cupric chloride was added to the pure ethaline melt. Polarisation data for cupric ion reduction to copper was collected using an RDE to determine where metal deposition was feasible. Smooth Cu deposits were obtained at -4.7x10^-3 A/cm² using 0.2 M CuCl₂.2H₂O at 25 °C at a current efficiency of (95±5)% at a rotation speed of 700 rpm. XRD analysis of the deposit showed a polycrystalline face centered cubic structure with (111) texture. The crystalline size was 66±10 nm with some internal strain. EDX analysis showed the presence of carbon and chlorine with copper in the deposit, which was due to the break-down of the DES. Several deposition processes were carried out from a single bath to examine bath stability. The bath was found to be stable when a soluble anode was employed, and became unstable when an insoluble anode was used due to other reactions proceeding at the cathode.

Publication metadata

Author(s): Ghosh S, Roy S

Publication type: Article

Publication status: Published

Journal: Surface and Coatings Technology

Year: 2013

Volume: 238

Pages: 165-173

Print publication date: 05/11/2013

ISSN (print): 0257-8972

ISSN (electronic): 1879-3347

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/j.surfcoat.2013.10.069

DOI: 10.1016/j.surfcoat.2013.10.069

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