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<p>The design of multifunctional nanomaterials to achieve improved electrochemical and antibacterial activity is of great significance for environmental and biomedical applications. Quaternary nanocomposite of Ag-Fe<sub>2</sub>O<sub>3</sub>-CeO<sub>2</sub>-WO<sub>3</sub> was successfully synthesized by hydrothermal-assisted synthesis and subsequent calcination. The heterostructured composite formation was confirmed by structural characterization which revealed the presence of coexisting crystalline α-Fe<sub>2</sub>O<sub>3</sub>, CeO<sub>2</sub> (fluorite), WO<sub>3</sub> (monoclinic) and face-centered cubic Ag. The synergistic interfacial interactions between the metal oxides and conductive Ag nanoparticles created efficient charge separation, efficient electron transport and increased catalytic active site. The electrochemical studies showed that the sensor exhibited good sensing performance for carbendazim (CBZ) and tetracycline (TC) with low detection limits of 0.032&#xa0;μM and 0.021&#xa0;μM, respectively, and a high sensitivity of 1.55 μA μM<sup>−1</sup> for CBZ and 2.41 μA μM<sup>−1</sup> for TC. The nanocomposite was also shown to have good antibacterial activity against both Gram-positive and Gram-negative bacterial strains, which included generation of ROS, release of Ag<sup>+</sup> ions, and oxidative destruction of bacterial membranes. The Ag–Fe<sub>2</sub>O<sub>3</sub>–CeO<sub>2</sub>–WO<sub>3</sub> nanocomposite material is a promising multifunctional material for sensitive electrochemical sensing and antibacterial applications.</p>

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Engineering of Ag-decorated Fe2O3-CeO2-WO3 nanostructures with oxygen vacancy-mediated redox activity for pesticide detection and antimicrobial action

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Munusamy Settu,
  • K. Menaka,
  • Dhanasekaran Arumugam,
  • S. Ayyanaar,
  • A. Manikandan,
  • Gnanamoorthy Govindhan,
  • Krishna Prakash Arunachalam,
  • Jothi Vinoth Kumar,
  • Raja Venkatesan,
  • M. Karthik

摘要

The design of multifunctional nanomaterials to achieve improved electrochemical and antibacterial activity is of great significance for environmental and biomedical applications. Quaternary nanocomposite of Ag-Fe2O3-CeO2-WO3 was successfully synthesized by hydrothermal-assisted synthesis and subsequent calcination. The heterostructured composite formation was confirmed by structural characterization which revealed the presence of coexisting crystalline α-Fe2O3, CeO2 (fluorite), WO3 (monoclinic) and face-centered cubic Ag. The synergistic interfacial interactions between the metal oxides and conductive Ag nanoparticles created efficient charge separation, efficient electron transport and increased catalytic active site. The electrochemical studies showed that the sensor exhibited good sensing performance for carbendazim (CBZ) and tetracycline (TC) with low detection limits of 0.032 μM and 0.021 μM, respectively, and a high sensitivity of 1.55 μA μM−1 for CBZ and 2.41 μA μM−1 for TC. The nanocomposite was also shown to have good antibacterial activity against both Gram-positive and Gram-negative bacterial strains, which included generation of ROS, release of Ag+ ions, and oxidative destruction of bacterial membranes. The Ag–Fe2O3–CeO2–WO3 nanocomposite material is a promising multifunctional material for sensitive electrochemical sensing and antibacterial applications.