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TiO2 and TiO2–V2O5 nanocrystals were prepared by coupling sol–gel and solvothermal methods, followed by heat-treatment at 400 °C, after which the mean nanocrystal size was about 5 nm. The materials were characterized by X-ray diffraction, transmission electron microscopy and solid state nuclear magnetic resonance spectroscopy. It was shown that while the TiO2 phase was always anatase even after heat-treatment at 500 °C, the presence of the vanadium oxide species enhanced the surface re-configuration of the Ti ions. Hence the coordination environment of surface Ti atoms was drastically changed, by formation of further bonds and imposition of a given local geometry. The final hypothesis was that in pure titania surface rearrangement occurs, leading to the new NMR signal, but this modification was favored in the TiO2–V2O5 sample, where the Ti surface atoms were forced into the final configurations …
Publication date: 
1 Oct 2015

Mauro Epifani, Elisabetta Comini, Raül Díaz, Carmen Force, Pietro Siciliano, Guido Faglia

Biblio References: 
Volume: 351 Pages: 1169-1173
Applied Surface Science