I think the best antibacterial coating should be made of silver. It is possible to deposit Ag on temperature-sensitive polymers by means of combination of a magnetron sputtering source and a neutral atom beam plasma source. If I was you, I'd take a look at this paper: http://www.sciencedirect.com/science/article/pii/S0040609001013268

Thanks, your info. was very helpful

You're welcome.

I think depends on coating composition the voltage and current can be different . Its better you find the suitable coating and then in according to your available apparatus

choose your method to plasma deposition. I really suggest you to use active screen plasma nitriding with silver screen to achieve antibacterial coating on polymer . Good luck

Thanks, I shall work on your suggestion....

If the surface is going to be exposed to sunlight, there has been some excellent research into using TiO2 for this purpose. It works well because it's a photocatalyst. For instance, http://www.freshpatents.com/Photocatalytic-titanium-oxide-sol-and-coating-composition-and-member-using-the-same-dt20080403ptan20080081758.php

Also work into combining them with silver and copper oxide, http://www.freshpatents.com/Process-for-preparing-copper-oxide-coated-antibacterial-material-dt20060803ptan20060172013.php

I think your better choise, if you want to use plama spray, are ceramic coatings. There are far publications about this theme, try with TiO2 and SnO2 and their suboxides.

Good luck!

In another way of action, think about the possibility of using HVOF or CGS if you want to coat with metals, maybe you decrease oxidation problems with these methods.

Thanks for help....