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<p>SnO₂ and Ag/SnO₂ nanocomposites were synthesized by co-precipitation method to investigate their structural and antibacterial properties using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and antibacterial activity. XRD confirmed material’s tetragonal structure and crystallite size varied between 20 and 45&#xa0;nm. FTIR spectra revealed characteristic vibrational modes of Sn-O and Ag-O, confirming hybrid structures. Disk diffusion method was used against <i>E. coli</i> and <i>B. subtilis</i>. During initial tests, the antibacterial activity was checked against <i>E. coli</i> and <i>B. subtilis</i> with same stock of samples while in subsequent experiments, the activity was repeated against <i>E. coli</i> only with two different stocks of samples. The results showed higher antibacterial activity against Gram-negative bacterium than Gram-positive bacterium and activity increased with higher Ag-contents. Decreasing crystallite size and increasing amount of these composites increases the antibacterial activity. Hence, Sn<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\:{\text{O}}_{2}\)</EquationSource> </InlineEquation>/Ag composites can be considered promising materials for biomedical coatings, sterilization, agricultural protection, and water purification applications.</p>

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Structural and antibacterial investigation of Ag based SnO₂ nanocomposites synthesized via Co-precipitation method

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • Bushra Parveen,
  • Mahmood-ul- Hassan,
  • Faiqa Aslam

摘要

SnO₂ and Ag/SnO₂ nanocomposites were synthesized by co-precipitation method to investigate their structural and antibacterial properties using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and antibacterial activity. XRD confirmed material’s tetragonal structure and crystallite size varied between 20 and 45 nm. FTIR spectra revealed characteristic vibrational modes of Sn-O and Ag-O, confirming hybrid structures. Disk diffusion method was used against E. coli and B. subtilis. During initial tests, the antibacterial activity was checked against E. coli and B. subtilis with same stock of samples while in subsequent experiments, the activity was repeated against E. coli only with two different stocks of samples. The results showed higher antibacterial activity against Gram-negative bacterium than Gram-positive bacterium and activity increased with higher Ag-contents. Decreasing crystallite size and increasing amount of these composites increases the antibacterial activity. Hence, Sn \(\:{\text{O}}_{2}\) /Ag composites can be considered promising materials for biomedical coatings, sterilization, agricultural protection, and water purification applications.