AVS 53rd International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP44
Study of Dye Molecule Orientation and Configuration in Dye Molecule Doped Polythiophene Films

Tuesday, November 14, 2006, 6:00 pm, Room 3rd Floor Lobby

Session: Surface Science Poster Session
Presenter: S. Takemura, Kanto Gakuin University, Japan
Authors: H. Kato, Kanto Gakuin University, Japan
S. Takemura, Kanto Gakuin University, Japan
Y. Watanabe, Kanto Gakuin University, Japan
T. Nara, Kanto Gakuin University, Japan
T Hayashi, Kanto Gakuin University, Japan
T. Sugiyama, Kanto Gakuin University, Japan
T. Hiramatsu, Kanto Gakuin University, Japan
N. Nanba, Kanto Gakuin University, Japan
Correspondent: Click to Email
Conducting polymer polythiophene (PT) films incorporated with dye molecule such as crystal violet (CV) and brilliant green (BG) were prepared by electrochemical doping and casting injection methods. Electrochemical doping was conducted in dye dissolved acetonitrile by applying negative voltage in a triangle wave to an as-grown PT film. Casting of dye molecules was conducted by dipping a PT film in dye dissolved acetonitrile so that the dye molecules diffused into the polymer film. Vibrational states of the doped dye molecule and the polymer backbone were investigated by FTIR RAS and transmission measurements in order to examine the dopant orientation and configuration in polymer chains in the hybrid films. In the case of brilliant green doping, CH in plane modes of the PT backbone which appeared around 800 cm-1 was almost identical in both spectra of doped polymer and non-doped polymer. In the case of electrochemically doping sample, however, ring stretching modes which appeared around 1585 cm-1 was observed only in the FTIR transmission spectrum, not observed in the FTIR RAS spectrum. However, in the case of casting sample, the ring stretching mode was observed by both of FTIR RAS and transmission measurements. The similar results was obtained in the case of CV doped PT films. This result shows that CV and BG molecule planes doped in polymer are inclined to be planar to the film plane in the case of electrochemical doping under a negative voltage in triangle wave. In the case of casting sample, the dopants were supposed to be randomly oriented. The results suggest that the manipulation of the molecular orientation and configuration would be possible by the electrochemical doping method.