Synthesis and structural, spectroscopic and nonlinear optical measurements of graphene oxide and its composites with metal and metal free porphyrins

2012 ◽  
Vol 22 (7) ◽  
pp. 3059 ◽  
Author(s):  
M. Bala Murali Krishna ◽  
N. Venkatramaiah ◽  
R. Venkatesan ◽  
D. Narayana Rao
Keyword(s):  
Graphene Oxide ◽  
Nonlinear Optical ◽  
Optical Measurements ◽  
Metal Free

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

2019 ◽  
Vol 28 (01) ◽  
pp. 1950005 ◽  
Author(s):  
Hamid Darabi ◽  
Mehdi Adelifard ◽  
Yasser Rajabi
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Graphene Oxide ◽  
Nonlinear Refractive Index ◽  
Nonlinear Optical ◽  
Silicon Oxide ◽  
Weight Ratio ◽  
Optical Measurements ◽  
Starting Solution ◽  
Nanohybrid Composite

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.

scholarly journals Optimizing the Kerr nonlinear optical performance of silicon waveguides integrated with 2D graphene oxide films

2021 ◽  
pp. 1-1
Author(s):  
Yuning Zhang ◽  
Jiayang Wu ◽  
Yang Qu ◽  
Linnan Jia ◽  
Baohua Jia ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Nonlinear Optical ◽  
Oxide Films ◽  
Optical Performance ◽  
Silicon Waveguides

High Yield Controlled Synthesis of Nano-Graphene Oxide by Water Electrolytic Oxidation of Glassy Carbon for Metal-Free Catalysis

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 9482-9490 ◽  
Author(s):  
Qinwei Wei ◽  
Songfeng Pei ◽  
Guodong Wen ◽  
Kun Huang ◽  
Zhaohong Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Glassy Carbon ◽  
High Yield ◽  
Controlled Synthesis ◽  
Metal Free ◽  
Electrolytic Oxidation ◽  
Nano Graphene

Doping and reduction of graphene oxide using chitosan-derived volatile N-heterocyclic compounds for metal-free oxygen reduction reaction

Carbon ◽  
2017 ◽  
Vol 120 ◽  
pp. 419-426 ◽  
Author(s):  
Subodh Kumar ◽  
Shmuel Gonen ◽  
Ariel Friedman ◽  
Lior Elbaz ◽  
Gilbert D. Nessim
Keyword(s):  
Graphene Oxide ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Heterocyclic Compounds ◽  
Reduction Reaction ◽  
Free Oxygen ◽  
Metal Free

Guanidinium Fluorooxoborates as Efficient Metal-free Short-Wavelength Nonlinear Optical Crystals

2021 ◽  
Author(s):  
Congcong Jin ◽  
Hao Zeng ◽  
Feng Zhang ◽  
Haotian Qiu ◽  
Zhihua Yang ◽  
...  
Keyword(s):  
Short Wavelength ◽  
Nonlinear Optical ◽  
Metal Free ◽  
Nonlinear Optical Crystals ◽  
Optical Crystals
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