Abstract
The two-dimensional (2D) SnS2 nanoflakes and flower-shaped SnS2 are grown on SiO2/Si substrate by chemical vapor deposition method using S and Sn powders as starting materials. The morphology, crystallographic structure and optical property of 2D SnS2 nanoflakes as well as flower-shaped SnS2 are investigated using scanning electronic microscope, X-ray diffraction, Raman spectroscopy, transmission electron microscopy and photoluminescence spectrum, respectively. When the substrate temperature is in the range from 525 to 575 °C, the flower-shaped SnS2 with six petals grow parallel to SiO2/Si substrate. When the substrate temperature is in the range from 410 to 525 °C, the 2D SnS2 nanoflakes with semi-hexagonal shape grow on substrate. However, these 2D SnS2 nanoflakes have different orientations on the substrate, some are parallel to the substrate, some are inclined on the substrate, and others are perpendicular to the substrate. Two different forms of SnS2 are both high-quality uniform layered structures with indirect bandgap of ~ 2.20 eV. The growth mechanism of flower-shaped SnS2 and 2D-SnS2 nanoflakes is discussed.
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