Plasma Functionalization Enables Diffusion Control of Reactive Oxygen Species.

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.