Abstract
Abstract Uniform porous SnO 2 hollow nanospheres with average diameters of about 100–200 nm have been reproducibly synthesized via a facile template- and surfactant-free hydrothermal method, using hydrogen peroxide 30% and stannous sulfate as precursors. The morphology, composition and structure of the resultant products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy and nitrogen adsorption–desorption technique. Experimental results demonstrated that the formation of these porous SnO 2 nanostructures is ascribed to an interfacial oxidation–dehydration mechanism. H 2 O 2 usage has an important effect on both the morphology and purity of the final products. The gas sensing properties of the as-prepared porous SnO 2 hollow nanospheres were investigated. By comparative gas sensing tests, the porous SnO 2 hollow nanospheres exhibited superior gas sensing performances over commercial SnO 2 nanopowders toward some typical volatile organic compounds (VOCs), implying their promising applications in gas sensors.
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