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<p>The massive utilization of chemical insecticides has deleterious environmental impacts and threatens plant protection systems. Developing alternative insecticides with eco-friendly and cost-effective traits is essential for ensuring food security and achieving sustainability. In this study, we synthesized carbon quantum dots (CQDs)/copper oxide (CuO) nanocomposites as novel and green nano-insecticides for controlling <i>Spodoptera littoralis</i> via a simple and environmentally friendly method. The as-synthesized CQDs@CuO nanomaterials were characterized using a spectrofluorometer, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). The analysis demonstrated the formation of CQDs@CuO nanocomposites with nanorod-like structures and fluorescence properties. Compared with pristine CuO nanorods, the prepared CQDs@CuO nanocomposites exhibited superior insecticidal activity against <i>S. littoralis</i>. Integrating CQDs with CuO nanorods markedly enhanced the larvicidal effect on the second and fourth larval instars of <i>S. littoralis</i>, with mortality rates of up to 78.57% within 5&#xa0;days of treatment, compared with only 24.49% for the pristine CuO nanorods. In addition, embedding CQDs in the nano-insecticide systems causes acute and chronic toxicity, contributing to pupation failure, lack of adult emergence, and reproductive defeat. The results of this study pave the way for further investigations of the insecticidal potential of CQDs within new-dimensional nanomaterials, which can be green and cost-effective.</p> Graphical Abstract <p></p>

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Role of Carbon Dots-Based Nanocomposites for Enhanced Insecticidal Efficacy Against Spodoptera littoralis

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Islam A. Abdelhafeez,
  • Esmat Ahmed El-Solimany,
  • Tamer Salem Attia,
  • Mallak Megalea Zikry,
  • Badriah Saad Al-Farhan,
  • Ahmed M. Abu-Dief,
  • Laila H. Abdel-Rahman

摘要

The massive utilization of chemical insecticides has deleterious environmental impacts and threatens plant protection systems. Developing alternative insecticides with eco-friendly and cost-effective traits is essential for ensuring food security and achieving sustainability. In this study, we synthesized carbon quantum dots (CQDs)/copper oxide (CuO) nanocomposites as novel and green nano-insecticides for controlling Spodoptera littoralis via a simple and environmentally friendly method. The as-synthesized CQDs@CuO nanomaterials were characterized using a spectrofluorometer, X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). The analysis demonstrated the formation of CQDs@CuO nanocomposites with nanorod-like structures and fluorescence properties. Compared with pristine CuO nanorods, the prepared CQDs@CuO nanocomposites exhibited superior insecticidal activity against S. littoralis. Integrating CQDs with CuO nanorods markedly enhanced the larvicidal effect on the second and fourth larval instars of S. littoralis, with mortality rates of up to 78.57% within 5 days of treatment, compared with only 24.49% for the pristine CuO nanorods. In addition, embedding CQDs in the nano-insecticide systems causes acute and chronic toxicity, contributing to pupation failure, lack of adult emergence, and reproductive defeat. The results of this study pave the way for further investigations of the insecticidal potential of CQDs within new-dimensional nanomaterials, which can be green and cost-effective.

Graphical Abstract