Morphology and photoluminescence of nanostructured oxides grown by copper passivation in aqueous potassium hydroxide solution
W.J. Stepniowski (Military University of Technology, TU Delft - Micro and Nano Engineering)
Stevan Stojadinović (University of Belgrade)
Rastko Vasilić (University of Belgrade)
Nenad Tadić (University of Belgrade)
Krzysztof Karczewski (Military University of Technology)
Shoshan T. Abrahami (TU Delft - (OLD) MSE-6)
Ivan Buijnsters (TU Delft - Micro and Nano Engineering)
JMC Mol (TU Delft - (OLD) MSE-6)
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Abstract
Copper foil was anodized in 1 M KOH at potentials ranging from −400 to −100 mV vs. Ag|AgCl electrode. Cyclic voltammetry showed a distinct peak with a maximum at around −150 mV. For anodizing at −100 and −200 mV, nanowires with diameters of ca. 19 and 24 nm respectively were found to be grown. Moreover, photoluminescence and X-ray diffraction show that the dominant phase is the CuO phase. At lower potentials, cuboidal micron sized crystals were formed and Cu2O was found to be the major phase.
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