Impedimetry and Microscopy of electrosynthetic Poly(Propylene imine)-co-Poly(3,4 ethylene dioxythiophene) dendritic Star Copolymer

摘要

The electrochemical impedance spectroscopy of generation 2 poly(propylene thiophenoimine)-co- poly(3,4 ethylene dioxythiophene) dendritic star copolymer (G2PPT-co-PEDOT) film was studied inLiClO4 solution. The results show that the electrochemical deposition of G2PPT-co-PEDOT on goldelectrode decreased the electrochemical charge transfer resistance when compared toAu|PEDOT|LiClO4 and Au|LiClO4 interfaces. This is attributed to an increase in the conjugation lengthof the polymer as result of the linking of the highly conjugated PEDOT to the dendrimer. Bodeimpedimetric analysis indicates that G2PPT-co-PEDOT is a semiconductor with a maximum phaseangle shift of 67.5 at 100 mHz. The star copolymer exhibited a 2-electron electrochemistry and asurface coverage of 97.3%. The morphology of the dendritic star copolymer was investigated byscanning electron microscopy and atomic force microscopy.