Development and Application of a New Method for Epitaxial Growth of Metals, Alloys and Multilayers by Surface Limited Redox Replacement Nikolay Dimitrov, SUNY at Binghamton, DMR 0742016.
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A quantitative study of the impact of key Cu plating parameters on the voiding propensity of solder joints with Cu plated in a commercially available plating solution (CAPS) is performed on a small Cu rotating disk electrode. It is shown that void-prone samples are deposited predominantly at higher overpotentials. Also, a Hull cell with a large cathode is used to scale up the voiding study. It is shown that plating conditions could be chosen in a way to generate both, void-prone and void-proof Cu on the same cathode panel, thus controlling the voiding propensity at larger scale.
CAPS for Acidic Cu2+ Plating
CAPS Plating in a Hull Cell
away from the anode
close to the anode
Me + H UPD - YES
Me + H UPD - NO
Pt growth by H UPD
This work proposes “green” alternatives for fabrication of viable and cost-efficient fuel cell catalysts coated by a thin Pt film. The research is aimed at establishing a protocol for the growth of continuous Pt thin films on foreign substrate surfaces. Unlike in previously reported studies, in this work SLRR is carried out via displacement of H UPD layer eliminating completely contaminations coming from Cu or Pb, used presently for platinization. The work explores SLRR of H UPD prone and no H UPD exhibiting substrates warranting direct or seeded growth, respectively.
roughening after SLRR
in comparison with OPD growth
area and roughness
after growth on
Nikolay Dimitrov - Invited Talks:
One Step from Au to Pt via Surface Limited Redox Replacement (SLRR) of Pb UPD
Recent Advances in UPD Assisted Epitaxial Growth of Metals and Multilayer Structures
Fred Wafula, a Ph.D. student in the PI’s group, received in 2011 the Chemistry Department Award for Outstanding Achievements in Teaching and was nominated for the Binghamton University Award for Excellence in Teaching.
Alexandra Foxx, a junior student in Chemical Engineering at Johns Hopkins University joined in May 2011 the PI’s group for a ten-weeksummer REU activity sponsored by NSF. She participated in a research associated with improving of our practices in making STM tips and she worked closely on strategies for SLRR deposition of Pt on foreign substrates .
DEPARTMENT OF SYSTEMS SCIENCE AND INDUSTRIAL ENGINEERING
Dr. Natasa Vasiljevic
Department of Physics,
University of Bristol, UK
Dr. Peter Borgesen