Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5361617 | Applied Surface Science | 2009 | 4 Pages |
Abstract
Three types of single-wall carbon nanohorn (SWNH) aggregates hybridized with carbon nanocapsules (CNCs) containing Fe3C, Co, or Ag were produced by laser vaporization of graphite mixed with Fe, Co, or Ag in Ar gas. Characterization by transmission electron microscopy revealed that although the three hybrid structures had different diameter distributions with average diameters of 96, 90, and 85Â nm, respectively, their SWNH layers had similar thicknesses (17-18Â nm on average). The diameter difference is explained by the sizes (16-24Â nm on average) of the encapsulated CNCs, the formation of which depended on the carbon solubility of the three metals and the precipitation of the graphitic layers. In addition, there was a stronger correlation between the diameters of the hybrids and the thicknesses of the SWNH layers for the three types. We suggest that the formation mechanism of the three structures is based on the assembly of SWNHs around a molten metal-carbon particle with certain ranges of lengths and diameters, respectively.
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Authors
Fumio Kokai, Naoki Tachi, Keita Kobayashi, Akira Koshio,