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Flexible and highly sensitive polyaniline-based (PAni) ammonia (NH 3 ) gas sensors were developed through an in-situ chemical oxidative polymerization process of aniline on a polyethylene terephthalate substrate at three different temperatures viz. 35⁰C, 0⁰C and -5⁰C. In the beginning stage, they were characterized with respect to their structural, morphological, and compositional analysis studies and in second stage, selectivity was tested for oxidizing (nitrogen dioxide, NO 2 ) and reducing (NH 3 , ethanol, methanol and hydrogen sulphide, H 2 S) gases. The sensor fabricated at 0 o C showed optimum response of 26% to 100 ppm NH 3 gas which was superior to those obtained for 10 sensors developed at 35⁰C (19%) and -5⁰C (23%). As-developed low-temperature flexible gas sensor has demonstrated fast response (19 s) as well as recovery times (36 s), 99 % reproducibility and good stability, enabling potential of commercial application, for example in industry where high temperature operation is prohibited. The impedance spectroscopy was used to investigate the plausible interaction mechanism of NH 3 gas molecules with flexible PAni film. Operation of NH 3 gas sensor, fabricated on a laboratory scale was tested and explored as a demo-video clip; available online as EIS. 15 45

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