Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3043580
Keywords
carbon; catalysts; iron; nanoparticles; nanotechnology; silicon compounds
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Funding
- NSF [NER-0508238, DMR-0804892]
- Alexander von Humboldt foundation
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We present the formations of crystalline silicon carbide (SiC) nanocones and heterostructures catalyzed by iron nanoparticles, originally encapsulated in graphite-like carbon shells, via the vapor-liquid-solid process. We propose that the nanocone shape is due to the release of iron nanoparticles from their carbon shells followed by agglomeration, where the increasing size of the iron nanoparticle during SiC growth creates the nanocone shape. The release and agglomeration model may explain the formation of multisegmented SiC nanostructures. The encapsulation and controlled release of the metal catalyst is a promising method for the synthesis of unusual one-dimensional nanostructures and complex heterostructures.
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