Synergistic effects of gelatin and convection on copper foil electrodeposition
2016 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 211, 245-254 p.Article in journal (Refereed) Published
Copper foil electrodeposition has been explored using a pure titanium rotating disk electrode (RDE) in acidic electrolytes containing gelatin and/or chloride ions under different convection conditions. In the plating bath without gelatin, the results indicate that stronger convection promotes hydrogen evolution, which reduces the current efficiency during copper plating. Gelatin restrains the growth of copper grains in the lateral direction parallel to the surface. This results in grain refinement on the shiny side, an increase in local grain misorientation and in internal stresses on both the shiny and the matte side, and a reduction in their internal stress difference. At strong convection conditions and with gelatin present, copper deposits as strip-like grains along the centrifugal direction of the cross section, and finally forms a spiral-shaped pattern on the matte side. The causes of these features are discussed in detail. The combined influences of hydrogen and gelatin adsorption are further elaborated in a model for a copper deposition. The current investigation suggests that a moderate convection (somewhat lower than 1000 rpm) and a concentration of 2 ppm gelatin in the plating bath are sufficient for copper foil fabrication in the presence of chloride ions (20 ppm).
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 211, 245-254 p.
Copper foil, gelatin, convection, hydrogen evolution, microstructure
IdentifiersURN: urn:nbn:se:kth:diva-193410DOI: 10.1016/j.electacta.2016.06.051ISI: 000380904100029ScopusID: 2-s2.0-84975894223OAI: oai:DiVA.org:kth-193410DiVA: diva2:1037085
QC 201610132016-10-132016-10-032016-10-13Bibliographically approved