Preparation of Surfactants Directed PANI/In2O3 Nanocomposite Thin Films and Its NH3-Sensing Properties

摘要

Polyaniline/indium oxide （PANI/In2O3） nanocomposite thin films have been prepared in water-dispersed medium with the presence of different surfactants by an in-situ self-assembly technique. A cationic surfactant TTAB （tetradecyltrimethyl-ammonium bromide） and a non-ionic surfactant tween-20 （poly （ethylene oxide） （20） sorbitan monolaurate） are used as additives. The nanocomposites and thin films are characterized by Fourier transform infrared （FTIR）, transmission electron microscopy （TEM）, and scanning electron microscopy （SEM）, respectively. The optical properties reveal the interaction between PANI/In2O3 nanocomposites and surfactants, and PANI/In2O3 thin films prepared in the presence of surfactants exhibits the finer nanofiber than the surfactants free PANI/In2O3 thin film. The ammonia （NH3） gas-sensing characteristic of PANI/In2O3 thin films and the effect of different surfactants on the gas-sensing property are studied. The results indicated that the film processed in the presence of TTAB has the highest gas sensitivity among all the prepared films.