Investigation of oxide nanowires growth on copper via passivation in NaOH aqueous solution

초록

A high-purity copper foil was passivated in aqueous solution of 1.0 M NaOH at -200 mV at room temperature. Top-view micrographs were taken after 30, 90, 150 and 600 s of passivation. Nanowires with a diameter of up to 56 nm, consisting of Cu2O and CuO were obtained. The mechanism of the nanowires growth was investigated based on the current density-time curves, relevant micrographs and morphology analyses. It was found that the nuclei is formed at electrolyte-electrode interface, leading to the formation of the first bunches of nanowires. Then, nanowires grow by the expansion and decomposition of the formed oxide bunches in the electrolyte, which can be understood through the current density - time curves.

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