ATOMIC-FORCE MICROSCOPY INVESTIGATIONS OF MORPHOLOGIES IN ULTRATHIN POLYANILINE FILMS

Preliminary results of two studies of the morphology of polyaniline, s tudied by means of atomic force microscopy (AFM), are reported. (1) Em eraldine base (EB)/camphorsulfonic acid (CSA) highly oriented fibers w ere prepared by a 'hot-drawing' technique. In addition to imaging the drawn fibers themselves, within the fibers, an internal structure with a clear orientation in the drawing direction is observed. (2) Submono layer coverages of EB/CSA spin-coated from a chloroform solution onto highly oriented graphite (HOPG) were studied, and geometrically shaped crystalline islands are observed. The internal structure of these isl ands is attributed to the presence of compact coils. Morphological cha nges upon 'secondary doping' using m-cresol vapor were studied. Upon s econdary doping, the crystallinity is lost.