Characterization of nonlinear optical refractive index for graphene oxide–silicon oxide nanohybrid composite

Abstract

In this work, Silicon oxide (SiO2) nanoparticles, graphene oxide nanosheet (GO) and GO–SiO2 nanohybrid composites have been synthesized. The role of GO concentration in the starting solution was investigated and correlated to the morphological, structural and optical properties of the studied samples. The structural studies for nanohybrid composites showed that by increasing GO:weight ratio from 0.5 to 2.0, not only does the SiO2 crystalline phase change from cubic to orthorhombic, but the structure of GO also transformed to RGO. The related FESEM images indicate that GO sheets are well-covered by SiO2 nanoparticles with very small grain size and that the accumulation of nanoparticles on each sheet has a high density. Linear Optical measurements showed two optical band gaps of [Formula: see text][Formula: see text]eV and 5.3[Formula: see text]eV for SiO2 nanoparticles, and band gap value of 4.15[Formula: see text]eV for GO nanosheets, which it reduces to 3.3[Formula: see text]eV after formation of the nanohybrid composite with GO: SiO2 weight ratio of 2.0. The nonlinear optical properties of GO–SiO2 with different weight ratio are measured using Z-scan technique. The results showed that the nonlinear refractive index of SiO2 and GO nanoparticles and nanohybrid composite (0.5:1,1:1,2:1) ([Formula: see text]–[Formula: see text]) changed and has a negative sign. It was observed that the nonlinear refractive index changes in different ratios of compounds. Experimental results show that after the formation of the composite, the nonlinear refractive index shows a significant increase in the presence and effectiveness of the GO.

Influence of preparation method on the structural, linear, and nonlinear optical properties of TiN nanoparticles

“…The nonlinear optical properties, the nonlinear refractive index, n 2 , and the nonlinear absorption coefficient, β, of the samples were investigated experimentally by the Z-scan technique [46][47][48][49]. The Z-scan setup is shown in the Figure 4.…”

“…There are many methods for measuring optical parameters accurately. One of the best ways for simultaneous the nonlinear refractive index and the nonlinear absorption coefficient is the Z-scan method [46][47][48][49].…”

Spray pyrolysis of graphene oxide based composite for optical and wettability applications

“…Incorporating silica nano-particles resulted in decreasing the band gap from 2.25 to 1.75 eV in SG10 sample and this value roughly remains unchanged for the other samples (SG20 and SG30). These significant change in band gap size may be attributed to the presence of silica nano-particles, whereas band gap size has not been affected by decreasing the ratio of nano-particles to graphene oxide [50].…”

Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO2/Graphene Oxide Nanocomposites

“…The optical absorption performance in the visible region could be enhanced by adding copper oxides and graphene oxide (GO) to TiO 2 nanoparticles [ 6 , 7 ]. Various methods of obtaining TiO 2 and GO based nanocomposites and their optical and photocatalytic properties extensive characterization are reported [ 8 , 9 , 10 , 11 , 12 ].…”