Effect of temperature on the structural, linear, and nonlinear optical properties of MgO-doped graphene oxide nanocomposites

Abstract

Magnesium oxide (MgO)-graphene oxide (GO) nanocomposites were prepared by the hydrothermal method at different temperatures. The effect of growth temperature on the structural, linear, and nonlinear optical (NLO) parameters was investigated. The decoration of MgO on GO sheets was confirmed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and UV-visible (UV-vis) spectroscopy analyses. The energy band-gaps of MgO-GO nanocomposites were calculated from UV-vis spectrum using Tauc plot. The NLO parameters of MgO-GO nanocomposites were calculated for the first time by the simple Z-scan technique with nanosecond Nd:YAG laser at 532 nm. The nonlinear absorption coefficient β and nonlinear refractive index n 2 for MgO-GO nanocomposites at the laser intensity of 1.1 × 10 8 W/cm 2 were measured to be in the order of 10 −7 cm/W and 10 −12 cm 2 /W, respectively. The third-order NLO susceptibility of MgO-GO nanocomposites was measured in the order of 10 −9 esu. The results showed that MgO-GO structures have negative nonlinearity as well as good nonlinear two-photon absorption at 532 nm. Furthermore, the NLO parameters increased by the enhancement of the growth temperature. As the investigation of new materials plays an important role in the advancement of optoelectronics, MgO-GO nanocomposites possess potential applications in NLO devices.

Graphene oxide:Fe2O3 nanocomposites for photodetector applications: experimental and ab initio density functional theory study

“… 16 The report has established the impact of oxidation leads to a variation in the energy gap. 40 The non-uniform variation in the oxidation content of GO and GO:Fe 2 O 3 and the double transitions of the π–π and n–π in the absorption account for the variational energy gaps. 41 …”

Cubic Nonlinearity of Graphene-Oxide Monolayer

“…Consequently, this energy difference facilitates photon-induced transitions between the π and π* orbitals. The initial peak corresponds to the π-π* transition of the C=C bond, while the subsequent peak corresponds to the n-π* transition involving the carbonyl (C=O) bonds of GO [42].…”

“…Consequently, this energy difference facilitates photon-induced transitions between the π and π* orbitals. The initial peak corresponds to the π-π* transition of the C=C bond, while the subsequent peak corresponds to the n-π* transition involving the carbonyl (C=O) bonds of GO [42]. The nonlinear absorption behavior of GO nanoflakes in DI water was characterized through an open z−scan technique, revealing normalized nonlinear transmittance as a function of sample position (z) across various peak excitation intensities, namely ~6.4 GW/cm 2 , 3.5 GW/cm 2 , 1.9 GW/cm 2 , 1.1 GW/cm 2 , and 0.1 GW/cm 2 at the focal plane (refer to Figure 3).…”

Evolution of graphene oxide (GO)-based nanohybrid materials with diverse compositions: an overview

“…The results showed that the catalytic ozonation significantly improved the mineralization of phenol compared to that without the catalyst. In parallel the hydrothermal method was followed by Kimiagar et al 213 to combine MgO with GO. The effect of growth temperature on the structural, linear, and nonlinear optical (NLO) parameters was investigated.…”