Published August 5, 2021
I've been reading about PEDOT, which is a conductive polymer.
I first heard about its use in making flexible, tissue-conforming electrodes for EMG and EEG, but it is apparently good for making electro-osmotic devices as well (as well as a whole host of other things).
The conductivity is quite good relative to other organic polymers, with several papers reaching a sheet resistance of 20Ω/sq . Compare this to a 1oz sheet of copper's sheet resistance of 0.5Ω/sq, and it's about the resistivity of titanium or lead. Raw PEDOT:PSS is something like 100kΩ/sq, so the dopants are really necessary.
Usually aqeous solutions are around 1-4% PEDOT:PSS by weight, with some adding 5% diethylene glycol to increase the conductivity. The PSS is needed for enhanced solubility, though it negatively impacts the conductivity. The reference  above adds a graphene oxide solution as well, also to increase conductivity. It's sometimes confusing because they give the conductivity instead of the resistance, but I'm sure it's convertible.
Sigma-Aldrich sells it in dried pellets as well. Some guy on the cyan site said dissolving it in water will destroy its conductivity, but that's what this paper did with no problem. About a gram of this stuff costs $50, and people on ebay are no kinder ($50 for 30g of 1.1%)
Sheets of this stuff are made by pouring out a solution and letting it dry. Some people will fire it in an oven at 60C for a few hours to get all the water out. In the end, you get a flexible sheet of it. Kinda cool!
You can also remove the PSS after drying to increase conductivity. Dipping it in a solvent does the trick here
You can add PDMS to make it stretchier (up to 80%!), but you'll need to add this surfactant with the dope name Triton X-100. Reference
Ok so it's not much, but I hope it gives you some good leads.