Dopant dimension influence on polyaniline film structure

The techniques of scanning force microscopy have been successfully used to investigate characterization of the surface structure of polymer films. We obtained AFM/STM images of polyaniline films with molecular resolution. The repeat unit consists of alternating phenyl rings (nitrogen atoms) in polya niline molecular chains. The results clearly showed characteristic structur e in polyaniline films. The molecular chains are separated by dopants with different sizes in the polyaniline films. The distance between molecular ch ains depends upon the size and geometric shape of dopants, the surface stru cture of polyaniline films were obviously observed to be also influenced.