A study of the galvanic replacement reaction at surfaces and the role of lateral charge propagation

Ott, Andreas, Bhargava, Suresh K., & O'Mullane, Anthony P. (2012) A study of the galvanic replacement reaction at surfaces and the role of lateral charge propagation. Surface Science, 606(1-2), L5-L9.

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The galvanic replacement of isolated nanostructures of copper and silver on conducting supports as well as continuous films of copper with gold is reported. The surface morphology was characterized by scanning electron microscopy and the replacement with gold was confirmed by EDX analysis. It was found that lateral charge propagation during the replacement reaction had a significant effect in all cases. For the isolated nanostructures the deposition of gold was observed not only at the sacrificial template but also at the surrounding unmodified areas of the conducting substrate. In the case of copper films the role of lateral charge propagation was also confirmed by connecting it to an ITO electrode through an external circuit upon which gold deposition was also observed to occur. Interestingly, by inhibiting the rate of charge propagation, through the introduction of a series resistor, the morphology of gold on the copper substrate could be changed from discrete surface decoration with cube like nanoparticles to a more porous rough surface.

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8 citations in Web of Science®

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ID Code: 64318
Item Type: Journal Article
Refereed: Yes
Keywords: Galvanic replacement, Charge propagation, Bimetallic
DOI: 10.1016/j.susc.2011.09.012
ISSN: 0039-6028
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 19 Nov 2013 01:07
Last Modified: 21 Nov 2013 03:55

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