Adsorption of metal cations from aqueous solution onto tin oxide thin films

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Abstract
Secondary ion mass spectrometry, x-ray photoelectron spectroscopy, electron energy-loss spectroscopy, x-ray diffraction, transmission electron microscopy, and 15N hydrogen profiling have been used to characterize rf sputter-deposited tin oxide thin films (1500–2500 Å) before and after immersion in aqueous solutions to determine the extent of film hydration and ion exchange activity. The results support a model in which the tin oxide film is comprised of microcrystalline, colloidlike particles or grains (200–300 Å), the ion exchange sites being located on the hydroxylated grain surfaces. The uptake of Na+ in the bulk film increases sharply at a pH=3–5 corresponding to literature values for the isoelectric point of SnO2.

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