DEVELOPMENT OF NH 3 GAS SENSOR OPERATING AT ROOM TEMPERATURE BASED ON POLYPYRROLE NANO FILMS
We have successfully synthesized Polypyrrole (PPy) films directly formed on the surface of the
electrodes by a facile route of vapor phase polymerization method, with the oxidant and dopant agent are
ferric chloride (FeCl3 ). The surface morphologies and chemical structure of samples were considered by
scanning electron microscopy (SEM), Fourier transforms infrared spectroscopy (FT-IR). The sensitivities
of sensing were studied based on resistance change to the concentration of the NH3 gas (100 - 400 ppm) at
room temperature. These results demonstrated that the response of gas sensor has been strongly affected
by surface morphologies of material membrane. This work shows that PPy films were fabricated from the
vapor phase for a lots promising in applications of NH3 gas sensors operating at room temperature
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