Abstract
In this study, we report the fabrication of high-performance gas sensor based on a heterojunction structure in which Fe2O3 nanoparticles were used to decorate MoO3 nanobelts. The pure MoO3 nanobelts exhibited a response to 100 parts per million (ppm) of xylene (ratio of resistance to air and gas = 9.08), with no obviously lower cross-responses to 100 ppm of ethanol, acetone, benzene, toluene, methanol and butanol. Compared with pristine MoO3 nanobelts, Fe2O3 nanoparticles decorated nanobelts demonstrated about 2–4 times higher response toward xylene. The enhanced sensing properties of Fe2O3 nanoparticles-decorated MoO3 heterostructured nanobelts can be attributed to the formation of heterojunction between Fe2O3 and MoO3. These results, combined with other reported literature, indicate that controlled engineering of surface loading/decorating is an effective strategy for designing highly sensitive and selective semiconducting metal oxide based gas sensors.
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