Nanostructured SnO2-TiO2 films as related to lithium intercalation
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The difference in degradation behavior of titania-doped tin dioxide films is explained by a pronounced effect of the doping level on the film dispersity and fine distribution of titania. A two to three times decrease in nanoparticles sizes in the doped films compared with nanoparticles in SnO2 film (20–30 nm) is revealed by using scanning tunneling microscopy (STM). Such STM data (measured in ex situ configuration) combined with XRD and Mössbauer spectroscopy analysis confirm that the nanoparticles are composed of nanostructured heavily disordered SnO2 and TiO2 rutile solid solution or of amorphous phase containing both SnO2 and TiO2, the content of the crystalline and amorphous phases being approximately equal.