Abstract
Highly stable gas sensors for high temperatures <400 °C with ultra-fast detection of hydrogen (H2) gas are immediately needed especially for the H2 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 H2 gas sensor. In the present work, M-HNTs-A-Pd nanocomposite was successfully synthesized and applied for high-temperature gas sensing. The obtained H2 gas sensing results present that the as-prepared gas sensor has the best gas response towards H2 gas at 300 °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 H2 (250 ppb–100 ppm). The H2-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 H2 gas sensor at higher temperatures.
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