Polymer based fabrics as transducers in ammonia & ethanol gas sensing

Chemically synthesized Intrinsically conductive Polymers (ICP’s), mainly Polypyrrole (PPy) and Polyaniline, coated cotton fabrics has been utilized as transducers in ammonia and ethanol sensing in broad range of concentrations. The response, in terms of decrease or increase in dc current on exposure to ammonia, ethanol and moisture is observed. It is found that, PPy coated fabric shows exactly opposite responses to each other when used for ammonia (decrease in current) and ethanol gas (increase in current) detection. Its response and recovery rate toward ethanol gas is higher as compared to ammonia gas. PANi coated fabric shows effective sensing towards ethanol vapor and less response towards ammonia sensing. The effect of variation in monomer concentrations and use of different sulphonic acid dopants on sensing mechanism of PPy and PANi coated cotton is studied towards one fixed concentration of ammonia and ethanol gas. Threshold concentration for ammonia and ethanol detection by PPy and PANi coated fabric is studied. Rate of change of conduction with time is analyzed for both PPy and PANi coated fabrics for deciding the selectivity of gas.

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