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Sn 3d core-level spectra are measured by X-ray photoelectron spectroscopy (XPS) for nearly monodisperse acidic and alkaline SnO 2-x nanoparticles in the size range 3-4nm (original) and 1.5-2.5nm (ultrafiltrated) in diameter. The comparison between the spectra obtained from the acidic and alkaline filtrated samples reveals that the difference is small after a few days but very large...
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