Plasma treatment heads

A printing system, comprising:

• an inkjet print head to form a printed image on a media substrate;
• and
• a plasma treatment head positioned with respect to the inkjet print head to treat the media substrate before or after printing the printed image, wherein the plasma treatment head comprises:
• a dielectric barrier formed of a dielectric material having a treatment surface and an interior surface opposite of the treatment surface,
• a first electrode embedded within the dielectric barrier beneath the treatment surface,
• a second electrode embedded within the dielectric barrier beneath the treatment surface and spaced laterally apart from the first electrode, and
• a plurality of injection holes penetrating through the dielectric plate from the interior surface to the treatment surface, wherein the plurality of injection holes are located between the first electrode and second electrode.

A method of plasma treating a media substrate, comprising:

• positioning a plasma treatment head from 0.1 mm to 10 mm from a media substrate, wherein the plasma treatment head comprises a dielectric barrier, a first electrode and a second electrode embedded within the dielectric barrier, and a plurality of injection holes penetrating through the dielectric barrier;
• applying a potential difference across the first electrode and the second electrode to generate a plasma arc at the treatment surface;
• and
• injecting a material into the plasma arc through one or more of the plurality of injection holes.