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<p>Silver nanomaterials are extensively used in biomedical coatings, wound dressings, antimicrobial and antifungal agents, and food packaging due to their unique physical and chemical properties. This study aimed to synthesize and characterize silver nanosheets using atmospheric pressure microplasma and evaluate their antibacterial and antifungal efficacy. Silver nanosheets were synthesized using silver nitrate as a precursor and sucrose in varying concentrations (1.6, 2.0, and 2.4&#xa0;mM) as a stabilizing agent. X-ray diffraction analysis confirmed the crystalline structure, free from impurity phases, specifically under optimum conditions. Scanning electron microscopy showed well-defined, uniform nanosheets synthesized with a 2.0&#xa0;mM sucrose concentration. UV–Vis spectroscopy indicated the smallest bandgap at this optimal concentration, and FTIR spectra showed characteristic silver peaks in the 500–600&#xa0;cm⁻1 range. The synthesized nanosheets demonstrated strong antibacterial activity against <i>Staphylococcus aureus</i> and significant antifungal activity against <i>Penicillium digitatum</i> and <i>Rhizopus stolonifer</i>. These findings suggest that the synthesized silver nanosheets have great potential for applications in antimicrobial and antifungal treatments, and they can be tuned by varying the sucrose concentration.</p>

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Evaluating the Biological Activities of Silver Nanosheets Synthesized by Atmospheric Pressure Microplasma

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Saeeda Saleem,
  • M. Naeem,
  • J. C. Díaz-Guillén,
  • Sadia Nazer,
  • Bushra Aziz,
  • Javed Iqbal,
  • José Díaz-Elizondo,
  • M. Álvarez-Vera

摘要

Silver nanomaterials are extensively used in biomedical coatings, wound dressings, antimicrobial and antifungal agents, and food packaging due to their unique physical and chemical properties. This study aimed to synthesize and characterize silver nanosheets using atmospheric pressure microplasma and evaluate their antibacterial and antifungal efficacy. Silver nanosheets were synthesized using silver nitrate as a precursor and sucrose in varying concentrations (1.6, 2.0, and 2.4 mM) as a stabilizing agent. X-ray diffraction analysis confirmed the crystalline structure, free from impurity phases, specifically under optimum conditions. Scanning electron microscopy showed well-defined, uniform nanosheets synthesized with a 2.0 mM sucrose concentration. UV–Vis spectroscopy indicated the smallest bandgap at this optimal concentration, and FTIR spectra showed characteristic silver peaks in the 500–600 cm⁻1 range. The synthesized nanosheets demonstrated strong antibacterial activity against Staphylococcus aureus and significant antifungal activity against Penicillium digitatum and Rhizopus stolonifer. These findings suggest that the synthesized silver nanosheets have great potential for applications in antimicrobial and antifungal treatments, and they can be tuned by varying the sucrose concentration.