Annealing of heterogeneous phase TiO2 films: An X-ray absorption and morphological study


Annealing of heterogeneous phase TiO2 films: An X-ray absorption and morphological study

Gago, R.; Redondo-Cubero, A.; Vinnichenko, M.; Vázquez, L.

Heterogeneous TiO(2) films with nanocrystalline (nc-) rutile and amorphous (a-) phases were annealed in vacuum up to 450 degrees C. The structural and morphological changes were studied by in situ X-ray absorption and ex-situ X-ray diffraction and atomic force microscopy. The annealing process leads to phase and morphological changes depending on the initial phase mixture. Films with dominant nc-rutile phase are quite stable whereas in a-TiO(2)-containing films the a-TiO(2) regions crystallize into nc-anatase at 300 degrees C. The latter is attributed to the initial anatase-like character of a-TiO(2). Interestingly, at 450 degrees C nc-anatase or nc-rutile is preferentially promoted for high or low initial a-TiO(2) contents, respectively.

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Publ.-Id: 15933