Abstract
We have synthesized large scale, thin, transparent graphene oxide (GO) flakes by Hummer’s method and investigated their suitability for fabrication of transparent nanocomposites. The GO flakes were comprehensively characterized by X-ray diffraction, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray analysis (EDX), Raman spectroscopy and Differential Scanning Calorimetry (DSC). X-ray diffraction displayed the peak of graphene oxide at 9°degree, which is characteristic peak of GO in agreement with the literature results. Scanning Electron Microscopy images revealed that thin, transparent, flake form GO with 14,8 µm lateral size and 0,31µm thickness were synthesized. The comparison with literature results show that for the first time, our group could synthesize large scale, thin and more transparent GO flakes by simple Hummer’s method using simple dispersed graphite. EDX measurements indicate the formation of layered structure with oxygen containing functional groups. The intensity ratio between D and G peaks in the Raman spectra proves that less defective GO flakes have been synthesized. The solution ability of the synthesized material indicate that high quality GO flakes were synthesized, which make them effective soluble material due to oxygen containing groups formed on the graphene plane during synthesis process.DSC results shows that these flakes are thermally stable till 200°C. Due to high solubility properties, large scale and transparency they can be very useful in fabrication of high optical transparent nanocompoties for replacement indium tin oxide transparent conductors in solar panels, biomedical applications and microwave absorbers for electromagnetic interference (EMI) environmental protection.
Highlights
Nanomaterials play an important role in fabrication of new generation devices due to their high surface to volume ratio, reduced size effects, extraordinary properties
The graphene powders synthesized by chemical approach show a strong D band in the Raman spectrum with the intensity ratio of ID/IG > 1 due to the defects and partially disordered crystal structure of graphene sheets
The Raman analysis result proves that the synthesized Graphene Oxide (GO) flakes are less defective based on the results of intensity ratio of the G and D bands
Summary
Nanomaterials play an important role in fabrication of new generation devices due to their high surface to volume ratio, reduced size effects, extraordinary properties. Carbon nanomaterials play an important role in improvement of nanotechnology. Graphene is very good semiconductor material with large surface area, high stiffness, good optical transmittance and high thermal conductivity properties [1,2,3,4,5,6,7]. Chemical exfoliation method is considered as an easy and cost-effective synthesis method for mass production of graphene. GO can be considered as a new “bridge” material for mass production of graphene. Graphene oxide is graphene sheet decorated with oxygen containing
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