Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 807, Issue -, Pages 181-186Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2017.11.047
Keywords
Copper oxides; Nanostructured oxides; Raman; XPS
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Funding
- Universidad Andres Bello [PMI-UAB 1301]
- Universidad Tecnologica Metropolitana (UTEM) [L216-03]
- Universidad de Santiago de Chile [USA 1555-Vridei 021741SP_PUBLIC]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas of Argentina (CONICET)
- Secretaria de Ciencia y Tecnologia (SECYT-UNC)
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We demonstrate that the anodization of copper in alkaline water/ethylene glycol media containing fluoride ions generates nanostructured copper oxide films. By modifying the anodization conditions (fluoride and OH- concentrations, applied voltage and anodization time), nanoflbrillar Cu2O as well as highly rough nanofibrillar network or nanoporous mixed Cu2O/CuO films are obtained. Raman and X-ray Photoemission Spectroscopy (XPS) results indicate that in fluoride presence, Cu(I) oxide is obtained when anodization takes place applying low voltages at a relatively low OH- concentration. In comparison, the subsequent oxidation to obtain Cu(II) species (CuO and Cu(OH)(2)) is promoted by increasing the OH- contents. According to the present results, an oxidation reaction scheme is proposed in order to gain a deeper understanding in the preparation of controlled nanostructured copper oxide films.
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