Abstract
TiO<TEX>$_2$</TEX> nanoparticles were prepared by photochemical synthesis in the dry toluene. The shape and size of the amorphous TiO<TEX>$_2$</TEX> nanoparticles were investigated by transmission electron microscope. The particle size was varied by the contents of the titanium (IV) isopropoxide in dry toluene. Especially networked TiO<TEX>$_2$</TEX> particles were formed from 40% titanium (IV) isopropoxide solution. The optical absorption spectra, photoluminescence, and PL excitation spectra of TiO<TEX>$_2$</TEX> in dry toluene were obtained. The were shifted to the short wavelength as the contents of TiO<TEX>$_2$</TEX> were increased. PL excitation had the peak at the wavelength regions is which the absorption increased steeply.
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