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

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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 m and ∼1.4 m, 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.
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Keywords: FLATTENED NANOTUBE; MPCVD; MWNT; NANOTIPS; RAMAN

Document Type: Research Article

Publication date: 2009-07-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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