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Crystalline silicon carbide nanocones and heterostructures induced by released iron nanoparticles
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View: Figures


Image of FIG. 1.
FIG. 1.

Morphologies and microstructures of the initial carbon-encapsulated iron catalysts and the resultant SiC nanocones and heterostructures. (a) SEM image of the initial graphite-like carbon-encapsulated iron nanoparticles. (b) TEM images of the initial carbon-encapsulated iron nanoparticles showing core-shell structure. The upper inset is the select area electron diffraction pattern of the nanoparticles. The lower inset is a HRTEM image of the iron core revealing -Fe structure. (c) SEM image of the resultant SiC nanocones. The inset is a TEM image of a typical SiC nanocone. (d) A HRTEM image of the tip of the SiC nanocone showing crystalline SiC with nanoscale twins surrounded by a thin amorphous layer. The inset shows the corresponding fast Fourier transformation of the HRTEM image revealing the nanotwin feature.

Image of FIG. 2.
FIG. 2.

(a) The size distribution of the iron core originally encapsulated within a carbon shell. (b) The size distribution of the catalyst droplet on the SiC nanocone. (c) Schematic of the route to the SiC nanocones.

Image of FIG. 3.
FIG. 3.

[(a)–(c)] TEM images of different multisegmented SiC nanocones. (d) HRTEM image of the region outlined by the box in (b) where the cross-sectional diameter changes, revealing epitaxial SiC structure surrounded by an amorphous phase. [(e)–(g)] The length vs the calculated catalyst size for SiC nanostructures containing one nanocone, two cylindrical, and three nanocone plus cylindrical segments, respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Crystalline silicon carbide nanocones and heterostructures induced by released iron nanoparticles