Nanostructure of polyaniline blends

The nanostructure of films of conductive blend polyaniline/cellulose acetat e (PANI/CA) is investigated by two real-space imaging techniques: transmiss ion electron microscopy (TEM) and atomic force microscopy (AFM). The hetero geneous nature of the disorder suggested by electronic transport measuremen ts is clearly evidenced. Moreover the clustering process of PANI is shown t o be anisotropic, with a preferential orientation in the plane of the film. For PANI content above 3% wt., the film surface is covered by PANI to a la rge extent, and surface segregation is sometimes observed.