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The preparation of transition metal-ion doped, two phase and core-shell nano-structured large band-gap semi-conductors based on TiO2, ZnO and WO3 will be described with a focus on the processing and the strong influence of the precursors on the materials structures and contents. The synthesis routes involve both alkoxide based routes and hybrid routes involving also salt based and gas-phase based atomic layer deposition. The phase development on heating and the target materials were investigated with techniques such as TGA, DSC/DTA, SEM, TEM, XRD, XAS, XES, IR-, Raman and UV-Vis-NIR spectroscopy. The photo-catalytic properties of the prepared materials will be described. |