Poly(3-methoxythiophene/ 3,4-ethylenedioxythiophene) Films Electrodeposited in Two Hydrophilic/ Hydrophobic Imidazolium Ionic Liquids: Voltammetric, UV/Vis Spectroelectrochemical, and AFM Morphology Comparisons

摘要

Electropolymerization and electro-co-polymerization of 3-methoxythiophene (MOT) and 3, 4- ethylenedioxythiophene (EDOT) in the ionic liquids (ILs) 1-butyl-3-methylimidazolium+ - terafluoroborate (BMIm BF4 ) and 1-octyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide+ - (OMIm Tf2N ) as well as the voltammetric, UV/Vis absorption spectroelectrochemical andmicromorphological properties of the resulting polymer films are compared and contrasted. MOT was+ - oxidized at a lower potential than EDOT in the hydrophilic BMIm BF4 , but the reverse being true in+ - the hydrophobic OMIm Tf2N . The MOT/EDOT mixture oxidation-onset potentials were similar inthe two ILs. Post-electropolymerization cyclic voltammograms (CVs) showed the deposition ofelectroactive thin films which didn dissolve-off. Among the other observations are that UV/Vis+ - absorption spectra indicated OMIm Tf2N resulted in polymer molecules with higher degree ofconjugation and more heterogeneous polymer films than did BMImBF4, and according to AFM imagesthicker and rougher films were obtained in the latter IL.