Effect of aging on the properties of TiO_2 nanoparticle

Effect of aging on the properties of titanium dioxide nanoparticles produced by laser ablation process in water is investigated experimentally. the fundamental wavelength of a q-switched nd:yag laser was employed to irradiate a high-purity ti plate in distilled water at temperatures of 20, 35, 50 and 65 °c. produced nanoparticles were diagnosed by uv–vis–nir spectroscopy, x-ray diffraction method, and dynamic light scattering device immediately after production and 1 week after. bandgap energy of samples was extracted using tauc method. size of nanoparticles was increased after a week and their bandgap energy was decreased. results show that the phase of tio_2 nanoparticles was transited from brookite to rutile after 1 week.