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<p>With the rise of highly resistive “super-bacteria,” the integration of nanomaterials in the medical and environmental fields has emerged as a promising solution. At the forefront, with their unique physicochemical properties, graphene oxide (GO) and silver nanoparticles (AgNPs) have exhibited exceptional antibacterial activity. In this study, pulsed laser ablation in liquid (PLAL) was employed to investigate the comparable shape- and size-dependent antibacterial activity and electrochemical properties of surfactant-free microcubic and nanospherical composites. Various characterization techniques confirmed the synthesis of pure, and high-quality materials. Our results indicated that optimal parameters of 140&#xa0;mJ and 10&#xa0;min yielded composites with synergistically enhanced properties. Furthermore, the GO-Ag micro-cube (GO-AgMC) composite exhibited superior antibacterial activity and electrochemical properties compared to GO-Ag nano-sphere (GO-AgNP) composites and their pure components, namely GO and AgNPs. Additionally, both composites successfully inhibited the growth of <i>Escherichia coli</i> (<i>E. coli</i>) and <i>Staphylococcus aureus</i> (<i>S. aureus</i>) with minimum inhibition concentrations (MIC) of 25 µL and 50&#xa0;µl, respectively. In conclusion, this study highlights the morphological dependence of GO-Ag composites for bacterial inhibition and electrochemical applications.</p>

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Graphene Oxide-Silver Composite Synthesis by Pulsed Laser Ablation in Liquid: Morphology Dependent Antibacterial and Electrochemical Properties

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Vania Sayyab,
  • Zakir Hussain,
  • Ayesha Noor,
  • Hamza Qayyum,
  • Hiba Shafique

摘要

With the rise of highly resistive “super-bacteria,” the integration of nanomaterials in the medical and environmental fields has emerged as a promising solution. At the forefront, with their unique physicochemical properties, graphene oxide (GO) and silver nanoparticles (AgNPs) have exhibited exceptional antibacterial activity. In this study, pulsed laser ablation in liquid (PLAL) was employed to investigate the comparable shape- and size-dependent antibacterial activity and electrochemical properties of surfactant-free microcubic and nanospherical composites. Various characterization techniques confirmed the synthesis of pure, and high-quality materials. Our results indicated that optimal parameters of 140 mJ and 10 min yielded composites with synergistically enhanced properties. Furthermore, the GO-Ag micro-cube (GO-AgMC) composite exhibited superior antibacterial activity and electrochemical properties compared to GO-Ag nano-sphere (GO-AgNP) composites and their pure components, namely GO and AgNPs. Additionally, both composites successfully inhibited the growth of Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) with minimum inhibition concentrations (MIC) of 25 µL and 50 µl, respectively. In conclusion, this study highlights the morphological dependence of GO-Ag composites for bacterial inhibition and electrochemical applications.