Abstract
A novel flexible, ultra-sensitive, selective and room temperature operable polyaniline-based hybrid (PAni/α-Fe2O3 PAni/WO3) ammonia (NH3) gas sensors were developed onto a flexible polyethylene terephthalate (PET) substrate by in-situ polymerization process. The observations were recorded to 100 ppm fixed level for various gases including NO2, CH3OH, C2H5OH, NH3 and H2S through monitoring the change in resistance of the developed sensor. The flexible (PAni/α-Fe2O3 PAni/WO3) hybrid sensor demonstrated better selectivity towards NH3. The synergistic response of the flexible hybrid sensors was remarkable than that of the PAni and α-Fe2O3 and WO3 alone; indicating the effective improvement in the performance of PAni flexible sensor on nanocomposite process. Moreover, the flexible sensor detected NH3 at low concentration (5 ppm) with a fast response (27 s) and very short recovery time (46 s). Further, PAni/α-Fe2O3 and PAni/WO3 hybrid flexible sensor films were characterized by X-ray diffraction, field-emission scanning electron microscopy, UV–visible and Raman spectroscopy, Fourier transform infrared and X-ray photoelectron for structural analysis, morphological evolution, optical and surface related studies.
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