Pom-pom-like nanowire clusters prepared by potentiostatic oxidation of copper in NH4HCO3 solution

Anna Brudzisz*, Damian Giziński, Ewa Wierzbicka, Krzysztof Karczewski, Urša Tiringer, Peyman Taheri, Wojciech J. Stępniowski

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Formation of hemispherical pom-pom-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|AgCl|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 μm. The mechanism for the formation of such nanowires clusters is proposed.

Original languageEnglish
Article number127674
Number of pages9
JournalSurface and Coatings Technology
Volume425
DOIs
Publication statusPublished - 2021

Keywords

  • Copper electrooxidation
  • Copper(II) hydroxide
  • Cuprite
  • Nanostructures
  • Tenorite

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