Abstract
Self-assembly of lower nanostructures into 3D superstructures is extensively investigated because of their excellent physicochemical properties. In this study, the hierarchical SnO2 nanostructures were prepared via two simple hydrothermal methods. The SnO2 nanostructures were characterized by X-ray diffraction (XRD), surface area analyzer (using BET method), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The SEM, TEM results revealed that the hierarchical SnO2 flowers were assembled by numerous one-dimensional tetragonal prism nanorods and the sphere architectures were formed by numerous smaller particles. The gas sensing results demonstrated that the different SnO2 nanostructures have great effect on the gas sensing behavior. The nanoflowers exhibited higher sensitivities to ethanol than the nanospheres, whereas the typical responses of these sensors to H2 and LPG indicated that the porous spheres demonstrated better sensing performance than the hierarchical flowers. This interesting phenomenon contributes to clearly understand about morphology-dependent gas sensing properties.
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