Charge transport and ammonia sensing response in poly (aniline-co-1-amino- 2-naphthol-4-sulphonic acid)

Abstract

The paper reports the synthesis of tubes of poly (aniline-co-1-amino-2-naphthol-4-sulphonic acid) using para toluene sulphonic acid as a dopant. The copolymers have the conductivity of the order of 0.348 S/cm to 0.198 S/cm depending on the ratio of the co-monomers present in the feed ratio. The morphology of the copolymers was studied by scanning electron microscope. Electrical conduction have been studied in the temperature range from 300 K to 30 K. Charge transport has been attributed as tunnelling in the range 30 K to 70 K. Above 70 K, charge transport is represented by Mott’s three-dimensional variable hopping. The copolymer has been found to be a better ammonia vapour sensing material and can be used for detection for varying concentration.