Near-Plasma Chemical Surface Engineering.

Area of Science:

• Surface Engineering
• Plasma Science
• Materials Chemistry

Background:

• Direct plasma exposure (DPE) often leads to uncontrolled surface reactions due to high energy ion bombardment.
• There is a growing need for precise control over surface chemical reactions in plasma-based material processing.
• Avoiding destructive ion bombardment is key to developing advanced surface modifications.

Purpose of the Study:

• To introduce a novel near-plasma chemistry (NPC) approach for controlled surface modification.
• To investigate the impact of NPC on poly (tetrafluoroethylene) (PTFE) activation and siloxane polymerization.
• To achieve low-temperature fabrication of porous SiOx coatings with enhanced properties.

Main Methods:

• A polymer mesh was placed near the plasma-sheath boundary to filter ions.
• Reactive species (neutrals, electrons, photons) were directed to the sample surface.
• Plasma activation of PTFE and plasma polymerization of siloxanes were performed using the NPC method.

Main Results:

• The NPC method enabled controlled plasma surface engineering by limiting ion bombardment.
• Enhanced wettability was observed for plasma-activated poly (tetrafluoroethylene) (PTFE).
• Low-temperature fabrication of porous SiOx coatings with improved film structures and durability was achieved.

Conclusions:

• Near-plasma chemistry (NPC) offers a viable alternative to direct plasma exposure (DPE) for controlled surface functionalization.
• The developed NPC technique facilitates significant chemical modification of polymer and ceramic surfaces.
• This approach yields enhanced material properties, including improved wettability and durable porous coatings.