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Deposition of ZnO rods by electrochemically induced Hydrolysis

Journal article
Authors Patrick Steegstra
Elisabet Ahlberg
Published in Applied Surface Science
Volume 289
Pages 345-350
ISSN 0169-4332
Publication year 2014
Published at Department of Chemistry and Molecular Biology
Pages 345-350
Language en
Links dx.doi.org/10.1016/j.apsusc.2013.10...
Keywords Electrodeposition, nanorods, SEM, solubility, zinc oxide
Subject categories Materials Chemistry, Coordination chemistry, Electrochemistry

Abstract

Galvanostatic electrodeposition of zinc oxide on gold electrodes was studied. Depositions were made from KCl solutions using oxygen reduction for driving the pH induced precipitation. The main focus was the influence of current density on the morphology and density of the deposit. The size, shape and density of the zinc oxide layer were shown to strongly depend on the current density. With an average rod diameter of 82 nm and a rod density of 36 μm−2 optimal conditions were found at −1.41mAcm−2. The experimental results are discussed within the context of zinc oxide solubility and the near surface pH. For this purpose a simple model for surface pH is considered, based on concentration profiles of reaction products near an RDE and the speciation of zinc in aqueous solution.

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