ELECTROCHEMICAL AND CHEMICAL SYNTHESIS OF POLYANILINE ON THE SURFACE OF VACUUM-DEPOSITED POLYANILINE FILMS

Electrochemical and chemical synthesis of polyaniline (PAN) was perfor med in an aqueous acidic solution of aniline on the surface of vacuum deposited thin polyaniline films applied on an SnO2 glass electrode. T he composite films obtained have a high homogeneity and uniform thickn ess, essential for vacuum deposited layers. Spectroelectrochemical cha racteristics of the composite layers prepared by electrochemical synth esis are similar to those of electrodeposited PAN. Composite layers pr epared by chemical synthesis have different spectroelectrochemical cha racteristics, probably due to the presence of by-products of chemical synthesis. High selectivity of the synthesis was observed on the cover ed areas of partly sputtered substrates, evidently due to the autocata lytic character of PAN synthesis.