Abstract
We report a novel technique to synthesize fluorescent carbon dots decorated graphene oxide (CDs-GO) sheets by microwave irradiation using citric acid as the precursor and ethylenediamine as the passivation agent. The samples are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and ultra violet-visible spectroscopy (UV-Vis). Fluorescence studies reveal strong excitation wavelength dependent fluorescence behaviour for these nanocomposites dispersed in water. Third order nonlinear optical properties of these composites are studied using Z scan technique with Q-switched nanosecond pulsed Nd: YAG laser and the measured highest nonlinear optical susceptibility is 4.624x10-10esu. The optical limiting studies of these nanocomposites yield a lower limiting threshold of 104MW/cm2 enabling them as a strong candidate for optical limiting applications.
Highlights
The material graphite oxide was first discovered by the oxford chemist Benjamin Brodie in 1859.1 Graphene oxide (GO) can be considered as the insulating and disordered analogue of the highly conducting crystalline graphene
We report a novel technique to synthesize fluorescent carbon dots decorated graphene oxide (CDs-GO) sheets by microwave irradiation using citric acid as the precursor and ethylenediamine as the passivation agent
The samples are characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and ultra violet-visible spectroscopy (UV-Vis)
Summary
The material graphite oxide was first discovered by the oxford chemist Benjamin Brodie in 1859.1 Graphene oxide (GO) can be considered as the insulating and disordered analogue of the highly conducting crystalline graphene. We report synthesis of graphene oxide nano sheets attached with carbon dots from citric acid under microwave irradiation. Materials with nonlinear optical (NLO) response are considered to be promising candidates for photonic applications such as optical communication, optical limiting and optical data storage applications.. There are few reports available on the nonlinear properties of GO in nano seconds and picosecond regimes.. Enhanced nonlinear response of graphene based materials are reported with different hybrid materials.. Enhancement of nonlinear optical properties have been achieved for GO-Au nanocrystal composites.. There are report based on the enhanced two photon absorption properties of GO–Ag nanocomposite by S. In this manuscript, NLO properties of CDs- GO composites have been thoroughly investigated and its optical limiting behaviour is reported Biswas et al. In this manuscript, NLO properties of CDs- GO composites have been thoroughly investigated and its optical limiting behaviour is reported
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