Multilayer thin films comprised of sequentially adsorbed layers of
partially doped polyaniline
and a polyanion, sulfonated polystyrene, were fabricated via the use of
a simple layer-by-layer molecular-level processing scheme. Using this simple multilayer polymer
adsorption process, uniform thin films of
polyaniline in the 40−600 Å thickness range were readily fabricated
onto a variety of different substrates.
Doping of these films with strong acids such as HCl and methane
sulfonic acid results in electrically
conductive thin films with conductivities comparable to those obtained
with spin cast films (0.5−1.0 S/cm).
The adsorption process used to fabricate the films was found to be
driven primarily by the electrostatic
attractions developed between the partially doped chains of polyaniline
(polycation) and the negatively
charged chains of the polyanion.
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