Highly conducting poly(3,4-ethylenedioxythiophene) (PEDOT) nanotubes were fabricated by vapor deposition polymerization using anodic aluminum oxide (AAO) nanopororus template. Highly ordered PEDOT nanotube arrays with high respect ratios were produced using this process. The nanoscale diameter and microscale length of the nanotubes were controlled by the pore sizes and depths of the AAO membranes, respectively. The PEDOT nanotubes in the bulk sample had a very high conductivity of 2,000 S/cm. Raman and X-ray photoelectron spectroscopies, transmission and scanning electron microscopies, and atomic force microscopy were used to determine the structure as well as the electrical and optical properties of the PEDOT nanotubes.

Highly transparent, thin polythiophene (PT) films were successfully synthesized by the plasma polymerization of thiophene. These films were doped with O 2 plasma by in-situ doping technique. The plasma polymerized PT films were deposited at about 50 to 340 nm/min, depending on the temperature and plasma power. A resultant transparency as high as 85% was achieved. The plasma polymerized PT films exhibited the characteristics of an insulator or semiconductor (10 1 0 ~ 1 2 Ω/̱ , 10 -7S/cm). The conductivity was immediately increased up to 10 Ω/̱ and 10 -2 S/cm, when doped with O 2 plasma. The plasma-doped PT films exhibited an increased surface roughness resulting in a decreased contact angle. However, the thickness of the PT layer was partially decomposed and/or etched with increasing voltage above 40 W.

Organic semiconducting polymer thin-films of 3-hexylthiophene, 3-octylthiophene, 3-decylthiophene, containing highly oriented crystal were fabricated by gas-phase polymerization using the CVD technique. These poly(3-alkylthiophene) films had a crystallinity up to 80%, and possessed a Hall mobility up to 10 cm2/Vs. The degree of crystalinity and the mobility values increased as the alkyl chain length increased. The crystal structure of the polymers was composed of stacked layers constructed by a side-by-side arrangement of alkyl chains and in-plane pi-pi stacking. These thin films are capable of being applied to organic electronics as the active materials used in thin-film transistors and organic photovoltaic cells.