Abstract
Hydrogen sulfide is a kind of widely distributed toxic gas, therefore, it is strongly necessary to conduct highly selective detection at lower concentrations. However, due to the high affinity of sulfur elements to transition metals, hydrogen sulfide sensors based on metal oxide semiconductors often have slower recovery and poor selectivity. In this work, Fe-NiOx nanotubes with unique structure and high specific surface area (175 m2/g) were synthesized by using anodized aluminum oxide templates for detecting sub-ppm H2S. The gas sensor based on 2 wt% Fe-doped NiOx nanotube performed exceptional gas sensing properties to 800 ppb H2S, featured with the high sensitivity (|ΔR/Ra| = 5.24), excellent selectivity (SH2S/SNO2 = 8.3) and fast response/recovery speed (3.2/8.1 s) at 270 °C. Density function theory calculation proved the critical function of Fe3+ to lower the adsorption enthalpy of H2S and changing the selectivity. This work not only provided a superior ppb-level H2S gas sensor, but also induced a synthesis strategy to enhance the gas sensing properties.
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