Abstract
The lability of gold-oxide thin films in contact with air, pure solvents, or electrolyte solutions was investigated by monitoring film thicknesses using spectroscopic ellipsometry. Surface compositions were monitored using low-energy ion scattering. The oxide was inert in air over 24 h, but decomposed partially in tetrahydrofuran (THF) and water, and completely in ethanol, within the same period. The film thicknesses decreased significantly in THF solutions of Bu4NPF6 and Bu4NBF4, but were more inert in solutions of Bu4NClO4 and LiClO4 in the same solvent, making the latter more suitable choices as supporting electrolytes in electrochemical studies.
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