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WO 3 –SnO 2  composite nanorods were synthesized by combining hydrothermal growth of tapered tungsten trioxide (WO 3 ) nanorods and sputter deposition of thin SnO 2  layers. Crystalline SnO 2  coverage layers with thicknesses in the range of 13–34 nm were sputter coated onto WO 3  nanorods by controlling the sputtering duration of the SnO 2 . The X-ray diffraction (XRD) analysis results demonstrated that crystalline hexagonal WO 3 –tetragonal SnO 2  composite nanorods were formed. The microstructural analysis revealed that the SnO 2  coverage layers were in a polycrystalline feature. The elemental distribution analysis revealed that the SnO 2  thin layers homogeneously covered the surfaces of the hexagonally structured WO 3  nanorods. The WO 3 –SnO 2  composite nanorods with the thinnest SnO 2  coverage layer showed superior gas-sensing response to 100–1000 ppm acetone vapor compared to other composite nanorods investigated in this study. The substantially improved gas-sensing responses to acetone vapor of the hexagonally structured WO 3  nanorods coated with the SnO 2  coverage layers are discussed in relation to the thickness of SnO 2  coverage layers and the core–shell configuration of the WO 3 –SnO 2  composite nanorods.

Enhancement of Acetone Gas-Sensing Responses of Tapered WO3 Nanorods through Sputtering Coating with a Thin SnO2 Coverage Layer