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Ag-SnO2/Polyaniline composite nanofibers for low operating temperature hydrogen gas sensor
Abstract
Silver doped tin oxide (Ag-SnO2) nanofibers were fabricated by electrospinning and subsequently calcinations technique. Ag-SnO2/polyaniline (PANI) composite nanofibers were prepared by facile in-situ polymerization dip-coating technique. As-synthesized composites nanofibers were characterized by XRD, SEM and studied for hydrogen gas sensing. Ag-SnO2/PANI composite was found to be more sensitive for hydrogen gas at low operating temperature around 420C compared to that of pure or doped SnO2 nanofibers required more than 250oC. Further, the response and recovery time of SnO2/PANI (SP), 1%Ag-SnO2/PANI (ASP1) and 2%Ag-SnO2/PANI (ASP2) composites were obtained at different concentrations 500-1500 ppm of hydrogen gas at an operating temperature of 420C. The good stability and lowest response as well as recovery time were observed for ASP2 composite for all concentrations of hydrogen gas compared to that of pristine SnO2 and other composites.
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ISSN 2394-0867