Synthesis and Structural Characterization of Catalyst-Free Carbon Micro-Cones

S Kumar, JWJ Hamilton, JAD McLaughlin, D Tanner

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4 Citations (Scopus)


We report the growth of vertically oriented carbon micro-cones without using any foreign catalyst on silicon (100) substrate by microwave plasma assisted chemical vapour deposition method. The average height and bottom diameter of the carbon micro-cones are ∼20 μm and ∼1.4 μm, respectively. The diameters of the carbon micro-cones decrease gradually from bottom to tip, terminating in a nanotube structure. Mechanical damage of micro-cones resulted in the breaking and partial removal of the carbon micro-cones to show the structures possessed a nanotube core. Outside the micro-cone, the nanotubes showed a flattened ribbon structure. Electron microscopy and micro-Raman spectroscopy shows the nanotubes are multi walled and highly graphitic, with low structural disorder. The advanced vacuum electron emission devices could be fabricated with the carbon micro-cones grown directly on silicon substrate without using any catalyst.
Original languageEnglish
Pages (from-to)4492
JournalJournal of Nanoscience and Nanotechnology
Issue number7
Publication statusPublished (in print/issue) - 2009


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