Abstract
The composition of thin surface layers on copper oxidized in alkaline media has been determined by combining in situ intensity modulated photocurrent measurements and laser Raman spectroscopy with cyclic voltammetry. Photocurrent measurements showed that the high intensity (≲250 W/cm 2) laser Raman probe beam facilitated reduction of the oxidized surface. Laser-facilitated reduction was used to identify the presence of CuO and Cu 2O and, when combined with Raman spectroscopy, to differentiate between the formation of CuO and Cu(OH) 2 films. Raman spectra confirmed that a thin Cu 2O film formed as oxidation of the copper surface was initiated. Increasing the potential produced a Cu(OH) 2 layer on top of the Cu 2O film. Further oxidation at higher potentials converted the Cu 2O film to a CuO underlayer that coexisted with the Cu(OH) 2 overlayer.
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