Hydrogen sulfide gas sensing properties of metal organic framework-derived α-Fe2O3 hollow nanospheres decorated with MoSe2 nanoflowers

The metal-organic framework (MOF)-derived alpha-iron oxide hollow nanosphere/molybdenum diselenide nanoflower (alpha-Fe2O3/MoSe2) composite is fabricated via simple hydrothermal route. Multiple characterization methods have proved the successful synthesis of alpha-Fe2O3/MoSe2 composites. The nanocomposite with a mass ratio of alpha-Fe2O3 and MoSe2 of 4:1 shows high response to H2S gas sensing. Moreover, the gas sensitivity test of the system shows that the alpha-Fe2O3/MoSe2 composite sensor exhibits a faster response/recovery rate, outstanding repeatability and anti-humidity interference toward H2S sensing at room temperature, which also shows excellent selectivity for H2S compared to various potentially interfering gases. Further studies have shown that alpha-Fe2O3/MoSe2 nanocomposites have improved H2S gas sensing performance due to the increased active sites and specific surface area, and the formation of n-n heterojunctions at the interface between alpha-Fe2O3 hollow nanospheres and MoSe2 nanoflowers.

Automated summary

The alpha-Fe2O3/MoSe2 composite fabricated via a simple hydrothermal route shows high response to H2S gas sensing, with a faster response/recovery rate, outstanding repeatability, and anti-humidity interference at room temperature, as well as excellent selectivity for H2S compared to other potentially interfering gases. This improved performance is attributed to the increased active sites and specific surface area, as well as the formation of n-n heterojunctions at the interface between alpha-Fe2O3 hollow nanospheres and MoSe2 nanoflowers.