主权项 |
1. A device for forming at an ambient atmospheric pressure a gaseous plasma comprising active species for treatment of a treatment region, the device comprising:
at least one plasma cell for forming said gaseous plasma for treating the treatment region, the at least one plasma cell comprising:
an inlet for receiving gas from a source and an outlet for discharging active species generated in the cell;a dielectric substrate enclosed around a flow path for gas conveyed from the inlet to the outlet;an electrode formed on or in the dielectric substrate for energising gas along the flow path to form active species; anda protective coating made of a dielectric formed on an inner surface of the dielectric substrate for protecting the dielectric substrate from reaction with the active species,the device further comprising:
an earth electrode comprising a dielectric substrate and an electrode formed on or in the dielectric substrate, wherein the earth electrode substantially surrounds and at least partially overlaps the at least one plasma cell. |