• Thermo-optical effect of TiO2 nanoparticles   (1391/11/5)
    Thermo-optical effect of TiO2 nanoparticles Titanium dioxide (TiO 2) nanoparticles(NPs) were synthesized using the pulsed laser ablation method. Ttransmission electron microscopy (TEM), X-ray diffraction (XRD) analysis were employed to characterise them. In addition, nonlinear optical response of the synthesized sample was studied under continuous wave (CW) He-Ne laser excitation at different input powers. Thermo-optical coefficients of the NPs were calculated. مشاهده ادامه
  • Analysis and Optimization of Silver Nanoparticles Laser Synthesis with Emission Spectroscopy of Induced Plasma   (1391/2/28)
    Analysis and Optimization of Silver Nanoparticles Laser Synthesis with Emission Spectroscopy of Induced Plasma Emission spectroscopy of the laser induced plasma is used to characterize the laser synthesis of silver nanoparticles in water via attributing the thermodynamic parameters of the plasma plume to qualitative features of the synthesized nanoparticles. In this approach, effects of the pulse energy and frequency of a pulsedNd:YAGlaser on nanoparticles synthesis yield and size distribution is studied by an analysis on the behavior of electron temperature and total density of the plasma dominant species (neutral Ag atoms; AgI). Variation of these thermodynamic parameters obtained from the time-integrated emission spectroscopy of the induced plasma was found to be in a closed correlation with the mentioned characteristics of the synthesized nanoparticles. مشاهده ادامه