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<p>In this study, we present a comprehensive work from fabrication to structural and optical analysis, in correlation with antibacterial evaluation of nitrogen-doped graphene quantum dots (N-GQDs), and sulfur-nitrogen co-doped (S,N-GQDs). These nanomaterials were synthesized using the microwave-assisted pyrolysis method combined with hydrothermal processing. Our findings confirm that integrating N and S dopant atoms into the C=C and C=O bonds of the graphene lattice significantly influence the GQDs’ structural and optical properties, with X-ray photoelectron spectroscopy (XPS) determining the doping levels of 11.8% for N and 2.8% for S. These doped GQDs exhibit excellent antibacterial performance, achieving over 99% efficacy against <i>E. coli</i>, <i>P. aeruginosa</i>, <i>S. aureus</i>, and <i>S. hyicus</i> bacteria. Our study indicates that the effective antibacterial mechanism is associated with the presence of C=O, C-OH, and pyrrole-like N(N-C)<sub>3</sub> functional groups of the doped GQDs, as evidenced by detailed XPS and Fourier-transform infrared (FTIR) spectroscopy analysis. This study provides a better understanding of the effects of functional groups on the antibacterial activity of doped GQDs, which show good promise as potent antibacterial agents against drug-resistant bacteria, while their robust photoluminescence properties enable real-time fluorescence monitoring of antibacterial activity.</p>

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Structural and Optical Properties of N-doped Graphene Quantum Dots and S,N Co-doped Graphene Quantum Dots for Antibacterial Applications

  • 期刊论文

  • 发表日期：

    2025年6月2日

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  • Pham Thu Nga,
  • Le Xuan Hung,
  • Nguyen Thi Mai Huong,
  • Phan Xuan Thien,
  • Nguyen Hai Yen,
  • Nguyen Tien Thanh,
  • Nguyen Thi Yen Chi,
  • Tran Thi Ngoc Dung,
  • Julien Laverdant,
  • Dao Nguyen Thuan

摘要

In this study, we present a comprehensive work from fabrication to structural and optical analysis, in correlation with antibacterial evaluation of nitrogen-doped graphene quantum dots (N-GQDs), and sulfur-nitrogen co-doped (S,N-GQDs). These nanomaterials were synthesized using the microwave-assisted pyrolysis method combined with hydrothermal processing. Our findings confirm that integrating N and S dopant atoms into the C=C and C=O bonds of the graphene lattice significantly influence the GQDs’ structural and optical properties, with X-ray photoelectron spectroscopy (XPS) determining the doping levels of 11.8% for N and 2.8% for S. These doped GQDs exhibit excellent antibacterial performance, achieving over 99% efficacy against E. coli, P. aeruginosa, S. aureus, and S. hyicus bacteria. Our study indicates that the effective antibacterial mechanism is associated with the presence of C=O, C-OH, and pyrrole-like N(N-C)3 functional groups of the doped GQDs, as evidenced by detailed XPS and Fourier-transform infrared (FTIR) spectroscopy analysis. This study provides a better understanding of the effects of functional groups on the antibacterial activity of doped GQDs, which show good promise as potent antibacterial agents against drug-resistant bacteria, while their robust photoluminescence properties enable real-time fluorescence monitoring of antibacterial activity.