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Figure S1. Transmission (TEM) and scanning (SEM) electron microscopic images showing the microstructure of titania prepared by thermal decomposition of the precursors. (a) acetylacetonate precursor, 673 K (TEM); (b) lactate precursor 673 K (TEM); (c) acetylacetonate precursor, 873 K (SEM); (d) lactate precursor, 873 K (SEM); (e) acetylacetonate precursor, 1473 K (SEM); (f) lactate precursor, 1473 K (SEM). Scale bars correspond to 100 nm (a, b), 400 nm (c, d), and 1 μm (e, f), respectively.

Figure S2. X-ray diffraction patterns of materials prepared by thermal decomposition in oxygen of the V-doped acetylacetonate-containing precursor. The temperatures of the thermal treatment range from 673 to 1273 K, in 100 K intervals (from bottom to top). Reflections marked with A and R correspond to the anatase and rutile TiO2 phases, respectively.

Figure S3. Scanning electron microscopic (SEM) images showing the microstructure of titania-based materials prepared by thermal decomposition in oxygen of the V-doped acetylacetonate-containing precursor. (a) 673 K, (b) 873 K, (c) 1073 K and (d) 1473 K. Scale bars correspond to (a) 200 nm, (b) 500 nm, (c) 300 nm, and (d) 600 nm.

Figure S4. X-ray diffraction patterns of materials prepared by nitridation of TiO2 prepared by thermal decomposition in oxygen of the acetylacetonate-containing precursor .The temperatures of the thermal treatment range from 673 to 1473 K, in 100 K intervals (from bottom to top). Reflections marked with A, R and RS correspond to the anatase, rutile and rock-salt phases, respectively.

Figure S5. Scanning electron microscopic (SEM) images showing the microstructure of titania-based materials prepared by thermal treatment in ammonia of TiO2 prepared at 673 K by thermal decomposition of the acetylacetonate-containing precursor. (a) 673 K, (b) 873 K, (c) 1073 K and (d) 1473 K. Scale bars correspond to (a) 200 nm, (b) 200 nm, (c) 500 nm, and (d) 1 μm.

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