Abstract
Designing a heterojunction structure between different band gap and energy level semiconducting materials is an effective way to enhance the gas sensing performance. In this work, a novel heterostructure composed of SnO2 nanorod/cube-like Fe2O3 was successfully prepared through a facile hydrothermal process. The morphology and microstructure were investigated by field emission scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The result shows the length of the cube-like Fe2O3 is 400 nm. The Fe2O3 nanocubes are uniformly coated with a large amount of SnO2 nanorods with the length of about 70 nm. Gas sensing tests indicated that such hierarchical SnO2/Fe2O3 nanostructures exhibited the ultra-fast response (~ 1 s) and enhanced ethanol sensing property compared with pure cube-like Fe2O3, mainly because of the synergistic effect and heterojunction. In addition, this study on as-prepared SnO2/Fe2O3 hierarchical assembly may provide insights and strategies for designing various novel hierarchical nanostructures for gas sensors.
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