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<p>In this study, the effect of thermal annealing on the optical and non-linear optical properties of MoS<sub>2</sub> quantum dots decorated graphene oxide (MoS<sub>2</sub>QDs/GO) has been reported. The MoS<sub>2</sub> quantum dots (MoS<sub>2</sub>QDs) and graphene oxide were separately synthesized by chemical exfoliation method followed by decoration of MoS<sub>2</sub>QDs on graphene oxide (GO) thin film by dip coating method. In the next step, the MoS<sub>2</sub>QDs/GO samples were annealed at temperature 300&#xa0;°C, 500&#xa0;°C and 600&#xa0;°C in an ambient environment. The structural and morphological studies were carried out using FESEM, TEM and AFM techniques. The homogeneous spreading of MoS<sub>2</sub>QDs on large surface area GO nanosheets was confirmed from FESEM and TEM images. AFM images reveal the thickness of MoS<sub>2</sub>QDs/GO are in the range of nanometers. The optical absorption measurement done using UV visible spectroscopy has revealed a gradual shift of band edge with increasing annealing temperature. The vibrational properties of GO and MoS<sub>2</sub>QDs/GO samples were studied using Raman spectroscopic measurements. More importantly Z scan measurements exhibit enhanced nonlinear optical (NLO) performance in annealed samples. This enhancement is attributed to increased π–π conjugation and stronger electronic coupling between MoS₂QDs and GO after annealing. Our study highlights the potential of annealed MoS<sub>2</sub>QDs/GO nanocomposites for advanced optical limiters, laser protection systems, and next-generation photonic devices.</p>

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Effect of thermal annealing on nonlinear optical properties of MoS2 quantum dots decorated graphene oxide nanosheets

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • P. K. Kasana,
  • Akanksha Pandey,
  • Tanuja Mohanty

摘要

In this study, the effect of thermal annealing on the optical and non-linear optical properties of MoS2 quantum dots decorated graphene oxide (MoS2QDs/GO) has been reported. The MoS2 quantum dots (MoS2QDs) and graphene oxide were separately synthesized by chemical exfoliation method followed by decoration of MoS2QDs on graphene oxide (GO) thin film by dip coating method. In the next step, the MoS2QDs/GO samples were annealed at temperature 300 °C, 500 °C and 600 °C in an ambient environment. The structural and morphological studies were carried out using FESEM, TEM and AFM techniques. The homogeneous spreading of MoS2QDs on large surface area GO nanosheets was confirmed from FESEM and TEM images. AFM images reveal the thickness of MoS2QDs/GO are in the range of nanometers. The optical absorption measurement done using UV visible spectroscopy has revealed a gradual shift of band edge with increasing annealing temperature. The vibrational properties of GO and MoS2QDs/GO samples were studied using Raman spectroscopic measurements. More importantly Z scan measurements exhibit enhanced nonlinear optical (NLO) performance in annealed samples. This enhancement is attributed to increased π–π conjugation and stronger electronic coupling between MoS₂QDs and GO after annealing. Our study highlights the potential of annealed MoS2QDs/GO nanocomposites for advanced optical limiters, laser protection systems, and next-generation photonic devices.