Tin oxide (SnO₂), an important and inexpensive semiconductor with a wide band gap (E_g=3.62 eV, at room temperature), is well known for its potential applications in gas sensors, transparent conducting electrodes, flat display devices and solar cells. On the other hand, the formation of SiO_x sheaths, which exhibit excellent insulating characteristics on the exterior of nanowires is essential not only to avoid interference between building blocks of a complex nanoscale circuit, but also to protect nanowires from contamination. Furthermore, the SiO_x coating layer is optically transparent for the visible absorption/emission of semiconductor nanowires, resulting in limited destruction of their intrinsic optical properties.While semiconductor crystals can be obtained in the nanometer length scale in various geometries, the one-dimensional (1D) variants warrant special attention because the anisotropy in quantum confinement potentials can be used to produce unusual optical, magnetic, and electronic properties. One of the most interesting and urgent challenges is the fabrication of 1D material with a novel morphology. Preparation of the nanoneedle is important not only for scientific interests but also for future industrial applications. In the present work, we report on the fabrication of SnO₂ needle-shaped nanostructures sheathed by a sputtering technique, their structural characterization, and also their photoluminescence (PL) spectrum.

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