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Plasma-deposited thin films precisely control reactive oxygen species (ROS) delivery for green applications. This method ensures efficacy through ROS, not leaching, offering solutions for antimicrobial resistance and water decontamination.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Environmental Science

Background:

  • Reactive oxygen species (ROS) offer green solutions for antimicrobial resistance and water decontamination.
  • Metal oxide nanomaterials in thin films can generate ROS via catalysis of oxygen and water.
  • Plasma deposition at room temperature (RT) is a viable method for creating these ROS-releasing materials.

Purpose of the Study:

  • To develop a strategy for precise control over ROS delivery using thin film plasma polymerization.
  • To investigate the ROS formation mechanism at the catalytic interface.
  • To ensure ROS-driven chemistry and material efficacy.

Main Methods:

  • Thin film plasma polymerization of silver oxide and titanium oxide semiconductors.
  • Plasma surface functionalization with nanoporous SiOx-like films (1-100 nm).
  • Characterization of ROS generation in the dark and detection of radical species (superoxide anion, singlet oxygen).

Main Results:

  • Demonstrated precise control over ROS delivery by tuning functional layer thickness.
  • Confirmed ROS production in the dark through charge separation without ion leaching.
  • Correlated radical detection with observed antimicrobial activity, validating ROS-driven efficacy.

Conclusions:

  • Thin film plasma functionalization offers a method for controlled ROS delivery.
  • The developed system ensures material efficacy is attributed to ROS, not direct redox reactions or leaching.
  • This approach holds promise for applications in antimicrobial resistance and water decontamination.