| 摘 要： | 1 Results Polypyrrole (PPy) is a typical conducting polymer with high conductivity and good stability,and has been widely used for detection of gases including ammonia and nitroxide1].However the reversiblity and selectivity of the response to these gases are always not satisfying.In the paper,conductive PPy film was deposited on the interdigital electrode modified by one bilayer of poly(diallyldimethylammonium chloride) and poly(sodium styrenesulfonate),by in-situ polymerization with FeCl3 as oxidizing agent and p-toluene sulfonic acid (p-TSA) as the doping agent2] to prepare a resistive-type gas sensor.Its gas sensitive properties to NH3 ranged from 5.5×10-5 to 3.3×10-3 was investigated at room temperature,and it was found that its sensitivity was greatly affected by the polymerization time,concentration of FeCl3,p-TSA and monomer.Prolonging the polymerization time or increasing the concentration of the oxidizing agent or doping agent resulted in a lower resistance and smaller sensitivity of the PPy film.
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