Abstract
Silver-polypyrrole nanocomposite (Ag-Ppy) films with different silver concentrations were synthesized without using any external oxidant i.e., with in-situ oxidation of pyrrole in the presence of silver nanoparticles. The gas sensing performance of all the films were investigated for NO, NO2, NH3, H2S, ethanol and methanol gases/vapours. The nanocomposite film was further doped with 05–25% p-toluenesulfonic acid (pTSA). Among various compositions, 15% pTSA doped Ag-Ppy thin films were found to be most sensitive and selective towards NO2 gas at room temperatures. The films exhibited a chemiresitive response of 68% at 100ppm NO2 with a response time of 148s and a recovery time of 500s. The films exhibited 21% response for NO2 even at low concentration levels at 5ppm. The improved response kinematics is attributed to porous structure with faster charge transfer through ohmic contacts between polymer and silver nanoparticles upon interaction with gas.
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