Could you please describe better how the film is handled and stored after deposition?

perhaps this you know already?

http://www.electrochemsci.org/papers/vol7/71110666.pdf

Dear Priyadharsini,

It was well known facts that these conjugated polymers decreases its conductivity due to oxidation/reduction process when kept in atmosphere. But when you doped some metal oxide in it, its conductivity increases as well as remains stable for a long time but here is also the limitation as mention in above answer.

Good luck.

Conduting polymer like polyaniline and polypyrrole are highly sensitive to humidity present in atmosphere. Due to the formation of O-H linkage amongst PAN/PPY chains, its conductivity decreases. 

This may be due to the reason that during synthesis, may be you used HCl or any inorganic acid as dopant. Try with organic acids, it may help. And other way is to dedop your film using ammonia and again re-dop with organic acids. (It will not only increase your staibility but also solubility).

Hi, 

Is it you talking about conducting polymer or polymer composites in particular..? Conductivity of a polymer obtained by doping it with some inorganic salt or a metal oxide lasts long and remain stable when stored appropriately.  

I would assume that you are depositing doped films, which are oxidized forms of polyaniline or polypyrrole.  Such oxidized films undergo reduction in the presence of moisture (i.e. H2O) in the atmosphere, which results in lower doping levels and thus lower conductivities. Neutral films can give the opposite trend, in which they undergo oxidation by oxygen in the atmosphere to give higher conductivities. If you store and measure your films under an inert atmosphere, you should get more consistent results.