کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1614653 | 1516339 | 2013 | 6 صفحه PDF | دانلود رایگان |
Ag doped TiO2 nanoparticles with various amount of Ag were synthesized through sol–gel technique. The optical, structural and framework substitution of the resultant particles was analyzed by UV–vis diffuse reflectance (UV-DRS) spectroscopy, X-ray diffraction (XRD), Raman, Transmission electron microscopy (TEM) and Fourier transform infrared (FT-IR) techniques. Results indicated that incorporation of Ag promoted the growth of TiO2 grains, agglomerated them and shifted the absorption edge to a lower energy. The incorporation of Ag in TiO2 was also confirmed by fluorescence quenching. The non linear optical response and optical limiting effects of the prepared samples was studied by a z-scan technique in which the Ag doped TiO2 nanoparticles dispersed in ethylene glycol were excited at 532 nm using 7 ns Nd:YAG laser pulses. The data fits well to a three-photon type nonlinear absorption process and is attributed to excited state absorption occurring in the nanostructures. It was seen that the optical nonlinearity was more prominent as the volume fraction of Ag concentration increased.
► Ag doped TiO2 nanoparticles have been synthesized by sol–gel method.
► Ag ions get uniformly dispersed among the TiO2 crystallites.
► Optical linear and nonlinear properties of these materials have been studied.
► The nonlinear transmissions were found to fit to a three photon absorption processes.
► It was seen that the optical nonlinearity was more prominent as the volume fraction of Ag concentration increased.
Journal: Journal of Alloys and Compounds - Volume 554, 25 March 2013, Pages 432–437