A METHOD TO PREPARE SOLUBLE POLYANILINE SALT-SOLUTIONS - INSITU DOPING OF PANI BASE WITH ORGANIC DOPANTS IN POLAR-SOLVENTS

Soluble PANI salt solutions can be prepared by mixing PANI base solutions with organic doping solutions in select polar solvents such as NMP and DMSO. Dopants containing carboxylate or amino groups, such as sulfosalicylic and m-sulfanic acids, yield soluble salt solutions. Free-standing films prepared from these solutions have a conductivity close to the value obtained in a pressed pellet doped with the identical dopant. UV-Vis spectra demonstrate the co-existence of highly doped and undoped phases in the partially doped solutions indicating that the doping process may not be a homogeneous one.