Plasma Polymerized Nanostructured Polyaniline as NO2 Gas Sensor

The nanostructured polyaniline (PANI) thin film has been prepared by using pulsed plasma
polymerization technique. The effects of substrate position, pressure and number of plasma pulses on
the film growth rate were monitored and established an ideal condition. The characterization of
prepared PANI thin film was performed with the ultraviolet-visible spectroscopy (UV-Vis), Fourier
transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) studies. The surface
of the thin film possessed three dimensional networks of the PANI belts as cauliflower like morphology
with a diameter of 35-97 nm. The NO2 gas sensing behavior was studied by measuring change in
electrical conductivity with respect to concentration and time. All the findings have been discussed
and results would be appreciably devoted in the area of sensor technology.