Published Paper Details:

The useful ammonia (NH3) gas sensor based on polyaniline (PANI) film as an active sensing layer. The PANI films prepared on a Glass substrate by a simple in-situ polymerization technique. In FTIR spectroscopy N-H and C- H stretching observed at the 3400 /cm which confirms the functional group of PANI. In UV�Visible absorption spectrum of the synthesized PANI film extended tail at 800nm representing the conducting ES state of Polyaniline. Ammonia (NH3) gas-sensing properties of the films prepared at 0oC conditions were examined at room temperature in the range of 10 to 100ppm.The room temperature functioning of the sensor is critical, which facilitates low-power operation and also enhances the life time of a sensor. The observed variation in resistance of PANI film corresponding to 10 ppm and 100 ppm of NH3 exposure. Furthermore, good reproducibility and long-term stability were also observed over a concentration range from 10 to 100 ppm. These results indicate that the PANI films on glass substrate promising for portable on-site detection.