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Sensing characteristics of the UV-enhanced gas sensor using the SnO2-TiO2 hollow sphere (HS SnO2-TiO2) at room temperature has been investigated. HS SnO2-TiO2 was prepared by coating the TiO2 on the outer- and inner-surfaces of HS SnO2 with hydrolysisof the titanium tetrachloride. HS SnO2 was synthesized by chemically induced self-assembly under hydrothermal condition. The morphology, crystalline structure and optical absorptivity of the HS SnO2-TiO2 were measured by means of X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and UV-Vis absorption spectra. A sensing mechanism related to the SnO2-TiO2 heterojunction as well as UV illumination was proposed.