The optical properties of plasma polymerized polyaniline thin films


Goktas H. , DEMIRCIOGLU Z., SEL K. , Gunes T., KAYA İ.

THIN SOLID FILMS, cilt.548, ss.81-85, 2013 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 548
  • Basım Tarihi: 2013
  • Doi Numarası: 10.1016/j.tsf.2013.09.013
  • Dergi Adı: THIN SOLID FILMS
  • Sayfa Sayıları: ss.81-85

Özet

We report herein the characterizations of polyaniline thin films synthesized using double discharge plasma system. Quartz glass substrates were coated at a pressure of 80 Pa, 19.0 kV pulsed and 1.5 kV dc potential. The substrates were located at different regions in the reactor to evaluate the influence of the position on the morphological and molecular structure of the obtained thin films. The molecular structure of the thin films was investigated by Fourier transform infrared (FTIR) and UV-visible photospectrometers (UV-vis), and the morphological studies were carried out by scanning electron microscope. The FTIR and UV-vis data revealed that the molecular structures of the synthesized thin films were in the form of leuocoemeraldine and exhibited similar structures with the films produced via chemical or electrochemical methods. The optical energy band gap values of the as-grown samples ranged from 2.5 to 3.1 eV, which indicated that these materials have potential applications in semiconductor devices. The refractive index in the transparent region (from 650 to 1000 nm) steadily decreased from 1.9 to 1.4 and the extinction coefficient was found to be on order of 10(-4). The synthesized thin films showed various degrees of granular morphologies depending on the location of the substrate in the reactor. (C) 2013 Elsevier B.V. All rights reserved.