Fe3O4-HNTs-APTES-palladium nanocomposites with enhanced high-temperature gas response properties

Abstract

Highly stable gas sensors for high temperatures <400 degrees C with ultra-fast detection of hydrogen (H-2) gas are immediately needed especially for the H-2 synthesizing industries that require high-temperatures. The Fe3O4-HNTs-APTES-Palladium (M-HNTs-A-Pd) nanocomposite possess exceptional physicochemical characteristics and possible to be ideal candidates for high-temperature H-2 gas sensor. In the present work, M-HNTs-A-Pd nanocomposite was successfully synthesized and applied for high-temperature gas sensing. The obtained H-2 gas sensing results present that the as-prepared gas sensor has the best gas response towards H-2 gas at 300 degrees C. Also, low sensor response to the interfering gases (nitrogen dioxide (NO2), ethanol (EtOH), hydrogen sulfide (H2S), benzene (C6H6), carbon monoxide (CO), and methane (CH4)) showed the improved selectivity towards hydrogen. The as-prepared sensor also presents stability as shown by its repeatable property after exposed at a different concentration of H-2 (250 ppb-100 ppm). The H-2-sensing response was systematically described in terms of the adsorption-desorption mechanism. In conclusion, M-HNTs-A-Pd nanocomposites system proves to be an ideal material for the highly-stable H-2 gas sensor at higher temperatures. (C) 2020 Elsevier B.V. All rights reserved.