Preparation and characterization of electrically conducting Langmuir-Blodgett films of poly(N-octadecylaniline).
A stable monolayer of N-octadecylaniline containing stearic acid at the air-water interface has been obtained. However, the Langmuir monolayer of pure poly(N-octadecylaniline) was not stable, but mixed Langmuir-Blodgett films of this polymer with stearic acid in different ratios as a spreading aid were stable. The electrical conductivity of these films increased by five orders of magnitude after doping with iodine as compared to that before iodine doping (5.8x10(-7) S cm(-1)). Temperature-dependent electrical conductivity suggested that these films were semiconducting in nature with low thermal activation energy. Impedance analyses of these films revealed that the equivalent circuit for poly(N-octadecylaniline) was (RQ) whereas that for mixed poly(N-octadecylaniline) with stearic acid was (RQ)(RQ).
Gupta
R K
RK
Department of Chemistry, Molecular Electronics Laboratory, Faculty of Science, Banaras Hindu University, Varanasi 221005, India. ramkrishnagupta04@yahoo.com
Singh
R A
RA