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HRSEM image showing growth of NWs on a sapphire substrate deposited by a Ni catalyst (, , and ).
HRTEM image of a NW showing that it is completely amorphous. Inset: diffraction pattern of this NW.
(Color online) EDS line scan across the NW. The Si to O ratio across the NW is constant. The STEM image (upper left) illustrates the line scan direction (white line).
(Color online) (a) EELS spectrum of a single NW. The Si:O ratio is . (b) and (c) are reference spectra of and Si, respectively. Both the edge and the line shape of (a) correspond to (b) and are different from (c) Si.
(Color online) Growth mechanism of NWs by VLS formation of a SiNW first followed by complete oxidation.
(Color online) Growth mechanism of NWs by formation of clusters on catalyst surface, surface diffusion to lower hemisphere, and diffusion to interface between substrate and catalyst.
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