Title :
Properties of viologen-TCNQ (2-2) Langmuir-Blodgett films
Author :
Lee, Yong-Soo ; Shin, Dong-myung ; Kim, Tae Wan ; Kang, Dou-Yol
Author_Institution :
Hongik Univ., Seoul, South Korea
Abstract :
In conducting systems based on Langmuir-Blodgett(LB) films, TCNQ derivatives have been extensively studied as electron acceptor molecules. We have investigated the optical, electrical, and magnetic properties of viologen-(TCNQ)2 LB films. In UV/visible absorption measurements, we have observed a TCNQ peak at 381 nm and a dimer peak at 626 nm. Iodine doping affects the degree of charge transfer and increases the conductivity of the films. The UV/visible absorption spectra of the LB film doped with I2 show a peak at 400~430 nm and there is no dimer absorption peak. Electron spin resonance (ESR) measurements suggest that the viologen-(TCNQ)2 LB film exhibits an anisotropic property, i.e. the ESR signal shows angular dependence. The in-plane electrical conductivity of the undoped film is approximately 4.3×10-6 S/cm at room temperature
Keywords :
Langmuir-Blodgett films; one-dimensional conductivity; organic compounds; paramagnetic resonance; synthetic metals; thermal analysis; ultraviolet spectra; visible spectra; 300 to 800 nm; DSC; ESR; I2 doping; TCNQ derivatives; UV absorption spectra; angular dependence; anisotropic property; charge transfer; conducting systems; dimer peak; electrical properties; electron acceptor molecules; in-plane electrical conductivity; magnetic properties; optical properties; viologen-TCNQ (2-2) Langmuir-Blodgett films; visible absorption spectra; Anisotropic conductive films; Conductive films; Conductivity; Doping; Electromagnetic wave absorption; Electron optics; Magnetic films; Magnetic properties; Optical films; Paramagnetic resonance;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.617671
