TiO2 nanoparticles have received a special attention due to their applications in many different fields. In this work we report on the production of TiO2 nanoparticles by means of a pulsed laser to ablate titanium metallic target submerged in water and ethanol. TiO2 nanoparticles with controllable average diameter have been obtained. Crystalline phases, morphology and optical properties of the obtained nanoparticles were characterized by means of transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and UV-vis absorption spectroscopy. The produced colloidal suspensions consisting in titanium dioxide crystalline nanoparticles showed spherical shape with diameters ranging from 3 to 40 nm. Nanoparticles are polycrystalline and exhibit the coexistence of anatase as well as rutile phases when de-ionized water is used as dissolvent, while the presence of brookite is observed when ethanol is used.
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