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

S Kumar, JWJ Hamilton, JAD McLaughlin, D Tanner

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

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.
LanguageEnglish
Pages4492
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number7
DOIs
Publication statusPublished - 2009

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Cones
cones
Carbon
catalysts
Catalysts
carbon
Nanotubes
synthesis
nanotubes
Silicon
Electron emission
silicon
Substrates
stopping
electron emission
Electron microscopy
ribbons
Raman spectroscopy
Chemical vapor deposition
electron microscopy

Cite this

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title = "Synthesis and Structural Characterization of Catalyst-Free Carbon Micro-Cones",
abstract = "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.",
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Synthesis and Structural Characterization of Catalyst-Free Carbon Micro-Cones. / Kumar, S; Hamilton, JWJ; McLaughlin, JAD; Tanner, D.

In: Journal of Nanoscience and Nanotechnology, Vol. 9, No. 7, 2009, p. 4492.

Research output: Contribution to journalArticle

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AB - 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.

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