Growth of SnO_2 nanowires by thermal evaporation on Au-coated Si substrates

摘要

Tin oxide (Sn02) nanowires have been grown on Au-coated Si substrates via a conventional thermal evap oration route using Sn powder. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and photoluminescence (PL) spectroscopy analyses have been performed to investigate the structure and PL properties of the products. The as-synthesized nanostructures have been found to have monocrystalline tetragonal rutile structure. The diameters and the lengths of the SnO_2 nanowires are in ranges of 50-550 nm and 200-500 um, respectively. The PL spectrum of the as-grown SnO_2 nanowires exhibited a broad emission band centered at around 595 nm and with a shoulder at around 555 nm in the yellow region. The growth mechanism of SnO_2 nanowires by thermal evaporation have also been discussed.