POLY(O-ANISIDINE) LANGMUIR-SCHAEFER FILMS - FABRICATION AND CHARACTERIZATION

The effect of pH on the Langmuir monolayer behavior was investigated f or the poly(o-anisidine) (POAS) conducting polymer. The Langmuir-Schae fer (LS) films were prepared at pH 1 of the subphase, where the doping during the monolayer formation was essential for the high quality of the conducting polymer film. The LS films of POAS were characterized b y using Fourier transform infrared spectroscopy, W-vis absorption, X-r ay diffraction, and ellipsometry techniques. The thickness of one mono layer of POAS film was estimated to 24 Angstrom by using X-ray reflect ivity and ellipsometric measurements. The uniformity of such POAS LS f ilms was investigated for the redoping in 1 M HCl (protonic acid) for achieving the higher conductivity. The conductivity of the POAS LS fil m was shown to vary between 0.1 and 10(-9) S/cm. Direct current throug h conducting LS films of POAS was observed as a function of monolayers . Further, the effects of different protonic acids on the electrical b ehavior of the POAS LS films were also investigated at length.