Did anyone perform any Voltammetry test on PEDOT:PSS films? At what voltage PEDOT:PSS will be decomposed?
In aqueous electrolyte? for how long? The main issue that comes to my mind is delamination from the substrate. 4.5V is a high voltage and there will be some oxidation. The formation of oxygen molecules at the interface might cause some stability issues and changes in the polymer film. Not sure about the PEDOT itself
Dear Hamid,
Thank you for your response. I am planning to use non-aqueous electrolyte. In fact, I am trying to use carbonate based electrolytes (EC, DMC or PC) which is used in Li-ion batteries electrolytes. In other words, my electrolyte consists of Li salt like LiPF6 in EC:DMC:DEC solvent (Vol 1:1:1) or other organic solvents such as Tetraethylene glycol dimethyl ether (TEGDME). The other thing is that I am going to spin coat PDOT:PSS on the surface of PDMS and use them together. In literature, it has been reported that the adhesion of PDOT:PSS with PDMS is pretty well. Another thing is that I am going to treat the surface of PDOT:PSS by some organic solvent /acid like Methanol or Formic acid to increase the electrical conductivity as nowadays many researchers do the surface treatment of PDOT:PSS in order to increase conductivity . I want to have a very conductive film which is stable at that voltage for a long time. If you have any suggestion, I would be grateful.
From my experience, PEDOT:PSS does not stick well to PDMS films. PEDOT:PSS is a water based suspension and likes hydrophilic surfaces, while PDMS surface is very hydrophobic.. so when you try to spin coat the suspension of PEDOT:PSS on top, it does not form a uniform film as most of the PEDOT:PSS liquid simply flies away.
About increasing the conductivity, you could try adding some additives like diethylene glycol in the PEDOT:PSS solution and then spin coating the film from this, instead of or before doing the surface treatment of a pre-cast film. There are many papers on additives for PEDOT:PSS, for example see http://onlinelibrary.wiley.com/doi/10.1002/adfm.200400016/abstract
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