Abstract

The oxidation of copper in alkaline solution has been studied by cyclic voltammetry, photocurrent spectroscopy and capacitance measurements. The study has shown that a layer of p-type Cu 2O is formed initially by the oxidation of Cu on the forward sweep of the cyclic voltammogram and that the thickness of the layer increases on the reverse sweep as an overlayer of Cu(OH) 2 or CuO is reduced to Cu 2O. The dielectric constant and optical absorption spectrum of the Cu 2O film have been derived from the capacitance and photocurrent measurements. The thickness of the Cu 2O film was found to depend on the electrolyte, decreasing in the order LiOH>NaOH>Na 2B 4O 7.

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