Synthesis and H2S sensing performance of MoO3/Fe2(MoO4)3 yolk/shell nanostructures

H2S gas, even in a low concentration in the environment, is very harmful to the health of human beings. Thus, the design and fabrication of gas sensors for detecting trace H2S gas are highly desirable. Herein we developed a facile method to fabricate MoO3/Fe2(MoO4)3 yolk/shell nanostructures with porous features. As the yolk/shell nanostructures were used to fabricate H2S gas sensors, they exhibited high sensor response, relatively rapid recovery and response times, and good selectivity and long-term stability. The sensor response value of MoO3/Fe2(MoO4)3 yolk/shell nanostructures to 1 ppm H2S gas was up to 1.7 even at a low working temperature (70 °C), significantly higher than those of MoO3 nanorods and other types of MoO3 based nanocomposites. Our results demonstrate that the yolk/shell nanostructures have very promising applications in high-performance H2S sensors.

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