VINYL FUNCTIONALIZED LANGMUIR-BLODGETT-FILMS FABRICATED FROM ELECTRICALLY CONDUCTIVE POLY(BROMOOCTYLTHIOPHENE-CO-VINYLHEXYLTHIOPHENE)

Langmuir-Blodgett (LB) films were fabricated from mixtures of poly(bro mooctylthiophene-co-vinylhexylthiophene) (PVHT copolymer) and deuterat ed stearic acid (d-SA). The molecular orientation of the mixed LB film s was studied by measuring surface pressure-area isotherms of the mono layers and visible absorption spectra, X-ray diffraction patterns, and FT-IR spectra of multilayer thin films. The FT-IR transmission and gr azing angle reflection spectra exhibited a strong polarization depende nce, allowing an estimation of the tilt angles of the hydrocarbon chai n axis for both the d-SA molecules and the PVHT copolymer. The main ch ains of the copolymer were found to be randomly distributed within the film, whereas the hydrocarbon tails of the d-SA molecules and the PVH T copolymer were found to be oriented nearly perpendicular to the film surface. The mixed LB films were rendered electrically conductive (2S cm(-1)) by doping with NOPF6, and FeCl3.