The Sensitivity of PolyPyrrole NanoTube / (Ag NanoParticle, Ag- NiO nanocomposite) Against H2S Toxic Gas at Low Temperature

Abstract

In this study, polypyrrole nanotubes (PPy NTs) as H2S gas sensors were fabricated at room temperature, and report the effect of oxidant- to- monomer (O/M) molar ratio and (Ag nanoparticles, Ag-NiO nanocomposite) adding on the H2S gas sensing behavior, where the nanoparticles covered the nanotubes and some agglomeration was observed. The structure of the nanotubes was proved using field emission scanning electron microscopy (FESEM). X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS) showed the compositions of all materials that exist in the prepared nanostructures. H2S gas sensing of PPy NTs for each molar ratio tested. It was found that the H2S gas sensing enhanced with an increase in the oxidant concentration. The response of H2S gas of the PPy NTs changed by (Ag) and (Ag-NiO) nanocomposite adding. It was observed that the largest response of H2S gas was 30.57 at 25 °C operating temperature, the response time and recovery time were 48.7 seconds and 10.7 seconds.

Keywords

• conducting polymer
• polypyrrole nanotube
• h2s gas sensor