Journal
SURFACE & COATINGS TECHNOLOGY
Volume 425, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.127674
Keywords
Copper electrooxidation; Nanostructures; Cuprite; Tenorite; Copper(II) hydroxide
Funding
- Polish Returns 2019 Project granted from Polish National Agency for Academic Exchange [PPN/PPO/2019/1/00003/U/0001]
- National Science Centre, Poland [NCN-MINIATURA4 DEC-2020/04/X/ST5/00383]
- Department of Construction Materials, Military University of Technology, Warsaw, Poland [UGB22-846/2021/WAT]
- Military University of Technology [UGB22-845/2021/WAT]
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The formation of hemispherical porn-porn-like clusters of nanowires during potentiostatic oxidation of copper in NH4HCO3 was reported. The nanowires, mainly composed of CuO, Cu2O, Cu(OH)(2), and Cu4O3, had a diameter of approximately 50-70 nm, while the clusters had a diameter ranging from 1-3 μm and strongly depended on the applied potential and time of electrooxidation.
Formation of hemispherical porn-porn-like clusters of nanowires during potentiostatic oxidation of copper in NH4HCO3 is reported. High-purity copper was oxidized in a three-electrode setup at constant electrode potential ranging from 200 mV to 1000 mV vs. Ag vertical bar AgCl vertical bar sat. KCl for 14 h. The obtained clusters of nanwires were examined using FE-SEM, XRD and XPS techniques. The diameter of nanowires, composed mainly of CuO, Cu2O, Cu(OH)(2), and Cu4O3, was ca. 50-70 nm. The diameter of the clusters strongly depends both on the applied potential and the time of electrooxidation, and was found to be in the range of 1-3 mu m. The mechanism for the formation of such nanowires clusters is proposed.
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