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<p>An eco-friendly and efficient route for synthesizing reduced graphene oxide (rGO) using <i>Mimosa pudica</i> leaf extract as a green reducing and stabilizing agent is reported. To address the limited understanding of structure–property relationships in green-synthesized rGO, a systematic study is performed. Analysis of graphene oxide (GO) and rGO using XRD, FTIR, Raman, and XPS confirms effective deoxygenation and restoration of <i>sp</i><sup><i>2</i></sup> domains. The spin-coated thin films of <i>Mimosa pudica</i> leaf extract reduced graphene oxide (MP-rGO) exhibit increased conductivity with a sheet resistance (R<sub>s</sub>) of 373 ± 18 kΩsq<sup>−1</sup> and high optical transmittance of 93.61% compared to the GO thin film. Optical studies indicate a reduction in the effective optical bandgap and blue photoluminescence emission. Z-scan measurements reveal reverse saturable absorption and self-defocusing behaviour. The nonlinear absorption (β) decreases after reduction, the nonlinear refractive index increases, and third-order susceptibility shows a moderate increase, indicating a modification of the nonlinear optical response due to structural reorganization and defect states. These results demonstrate a structure–property correlation, highlighting MP-rGO as a material for photonic applications.</p>

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Eco-friendly synthesis of reduced graphene oxide via Mimosa pudica extract: structure–property correlation and nonlinear optical response

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • Veena Shivadas Kindalkar,
  • Sandeep K. M,
  • Felcy Jyothi Serrao,
  • S. M. Dharmaprakash

摘要

An eco-friendly and efficient route for synthesizing reduced graphene oxide (rGO) using Mimosa pudica leaf extract as a green reducing and stabilizing agent is reported. To address the limited understanding of structure–property relationships in green-synthesized rGO, a systematic study is performed. Analysis of graphene oxide (GO) and rGO using XRD, FTIR, Raman, and XPS confirms effective deoxygenation and restoration of sp2 domains. The spin-coated thin films of Mimosa pudica leaf extract reduced graphene oxide (MP-rGO) exhibit increased conductivity with a sheet resistance (Rs) of 373 ± 18 kΩsq−1 and high optical transmittance of 93.61% compared to the GO thin film. Optical studies indicate a reduction in the effective optical bandgap and blue photoluminescence emission. Z-scan measurements reveal reverse saturable absorption and self-defocusing behaviour. The nonlinear absorption (β) decreases after reduction, the nonlinear refractive index increases, and third-order susceptibility shows a moderate increase, indicating a modification of the nonlinear optical response due to structural reorganization and defect states. These results demonstrate a structure–property correlation, highlighting MP-rGO as a material for photonic applications.