Abstract
An attempt was made to prepare nanocomposites of polypyrrole (PPy) and Tungsten disulphide (WS2) chalcogen as a matrix and filler, respectively. The aim of the current work is to develop a highly selective and response for ammonia gas sensor. The various physiochemical techniques like X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Energy dispersive X-ray spectroscopy (EDS) has been used for the characterization of prepared nanocomposites. The good dispersion of WS2 filler in the matrix of PPy has been done by the in-situ chemical oxidative polymerization route. Further, the sensing of gas like Hydrogen, Ethanol, Carbon mono-oxide, Carbon dioxide and ammonia for PPy and PPy/WS2 (1 wt%, 5 wt%, 10 wt%, 20 wt% and 30 wt%) nanocomposites were carried out at room temperature. A superior sensing for ammonia gas has been observed for PPy/WS2-5 wt% sample with 3.04–30.10% response for 50–200 ppm concentration of ammonia. The recorded response and recovery time for this nanocomposites was 51 s and 79 s, respectively. In addition to this it shows good repeatability and high selectivity for the ammonia gas.
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