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<p>This study investigates the influence of silver oxide grain size, individual silver nanoparticles, and energy band gap on the mechanism of water adsorption on Ag/Ag₂O composites synthesized by oxygen plasma treatment. Analysis of the OH-group absorption peak in the FTIR spectra revealed a strong linear correlation between the OH peak intensity and the energy band gap in oxygen-rich samples. On the other hand, band gap measurements indicate that the samples’ electrical conductivity significantly influences water adsorption: the amount of absorbed water decreases as conductivity decreases. In addition, the proportion of water molecules bound by weak hydrogen bonds increases with either increasing oxide grain size or decreasing energy band gap. Furthermore, the formation of individual silver nanoparticles near grain boundaries leads to a reduction in water molecules bound by strong hydrogen bonds.</p>

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Effect of Nanoscale Properties on Water Adsorption on Ag/Ag2O Composites Synthesized by Oxygen Plasma Treatment of Silver Thin Films

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Kamal Kayed,
  • Walaa Alfakeer,
  • Mayada Issa,
  • Bilal Zaarour

摘要

This study investigates the influence of silver oxide grain size, individual silver nanoparticles, and energy band gap on the mechanism of water adsorption on Ag/Ag₂O composites synthesized by oxygen plasma treatment. Analysis of the OH-group absorption peak in the FTIR spectra revealed a strong linear correlation between the OH peak intensity and the energy band gap in oxygen-rich samples. On the other hand, band gap measurements indicate that the samples’ electrical conductivity significantly influences water adsorption: the amount of absorbed water decreases as conductivity decreases. In addition, the proportion of water molecules bound by weak hydrogen bonds increases with either increasing oxide grain size or decreasing energy band gap. Furthermore, the formation of individual silver nanoparticles near grain boundaries leads to a reduction in water molecules bound by strong hydrogen bonds.