COMPOSITE POLYANILINE CALIXARENE LANGMUIR-BLODGETT-FILMS FOR GAS-SENSING/

Mixtures of the polyaniline (emeraldine base) and phosphorylated calix [4]resorcinolarene derivative (CA) are proposed to prepare LB films fo r conductometric gas sensors. They are quite stable at the air-water i nterface and give LB films of high quality. The average thickness of t he mixed monolayers is found to be 1.6 nm. The as-deposited films are insulating. Doping with HCl increases the conductivity up to between 0 .6 x 10(-3) and 0.5 S cm(-1) which depends on the component ratio. The films containing more than 20 wt% of CA are doped reversibly in part. Thus, the films which are highly sensitive to either NH3 or HCl films are prepared by choosing the component ratio. Detection of NH3 and HC l in the ppm range is demonstrated.