Atmospheric pressure plasma sources have been
emerging as a new tool for modifying polymer w1–3x
andyor metal surfaces w4–7x. Especially, radio frequency
(RF) ejected plasma sources operating in air can be
used for arbitrary shaped objects, regardless of its
conductivity, i.e. for both insulating and conducting
objects. For the success of the source, efficient generation of radicals such as atomic oxygen is very important,
while keeping relevant gas temperatures in the plasma
source for specific applications w1,8,9x. Also, discharges
need to be maintained as glow-like characteristics without streamers for uniform and high-quality surface treatments.