Graphite-encapsulated alumina nanoparticles fabricated by hot-filament chemical vapor deposition
Graphite encapsulation occurs for metal or carbide nanopartices and is explained by segregation of graphite shells from molten nanoparticles. We report a different type of graphite encapsulation: graphite-encapsulated alumina nanoparticles obtained by hot-filament chemical vapor deposition. Transmission electron microscopy and energy dispersive X-ray spectroscopy showed that alumina nanoparticles were formed as inner cores with sizes ranging from approximately 50 to 200 nm. X-ray diffraction and selected area diffraction patterns indicated the structures of the alumina nanoparticles consisted of monoclinic 1, 2 and orthorhombic δ 2 phases, which are higher temperature phases of bulk alumina. The results suggest a different graphite-encapsulation mechanism from segregation of graphite shells out of molten nanoparticles.
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Document Type: Short Communication
Publication date: December 1, 2013
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