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The University of Southampton

Assessment of Choline-Chloride based Ionic Liquids for Metal Deposition Seminar

27 March 2014
Room 2003, Building 27 Chemistry University of Southampton Southampton So17 1BJ

For more information regarding this seminar, please email Dr Andrew Hector at .

Event details

Prof Sudipta Roy presents this seminar as part of the Electrochemistry seminar series.

Electrodeposition from ionic liquids have been heralded as the sustainable option to plating processes which require corrosive or toxic chemicals. At Newcastle we are testing the potential of ionic liquids (more precisely deep eutectic solvents, DES’s) for their potential to replace aqueous based plating operations. We have used a typical DES to plate copper, tin, and copper-tin alloys. In this presentation we will show the results obtained for copper deposition, and use it as an example to determine the issues which require resolution for its industrial use.

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, which is usually used in industry, 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. 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. Plating rates for copper deposition were compared against those for aqueous systems. In addition, the cost and availability of the DES was set against that of water-based electrolytes to determine if such processes could provide economical solution.

Speaker information

Prof Sudipta Roy, Newcastle University. Prof Sudipta Roy graduated from IITDelhi (1985) with a BEng in Chemical Engineering. She finished her PhD studies from Tulane University (1986-1991), USA in electrochemical deposition, and then moved to the materials department in EPFL, Lausanne. She arrived in the UK to take up her position as Lecturer (1994), then Reader, and finally as a Professor of Electrochemical Nanomaterials in 2005. Her research interests are mainly in electrochemical processing of novel materials and their characterisation. She has spun out Royenface (2011) which aims to commercialise some of her expertise and inventions related to surface innovation and microfabrication using electrochemical processes. She serves on the Electrochemical Engineering working group of EFCE, the SCI-Electrochemical Technology Group, and is a Fellow of both Inst. Chemical Engineers and Inst. Metal Finishing.

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