Abstract
Investigating high-performance and low-energy consumption H2S sensors has become a hot research topic. This study adopted a one-step co-precipitation method to synthesize La-doped ZIF-8 deprotonating zinc acetate, lanthanum nitrate, and 2-Methylimidazole in an aqueous. La2O3/ZnO were synthesized with different La3+ doping concentrations (0, 0.5, 1, and 1.5 at%). We found that La3+ doping at a concentration of 1 at% showed the highest response value of 140 for 5 ppm H2S, at a low operating temperature of 100 °C, which is 2.4 times higher than that of pure ZnO. Additionally, La3+ doping led to a lower detection limit of 1.9 ppb. The enhanced performance can be attributed to the widening of the difference in electron concentration, the increase in vacant oxygen content, and the spillover effect of H2S sensing. These factors were analyzed in detail by means of porosity, P-N heterojunctions, and the increased in adsorbed oxygen content caused by La3+doping.
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