Investigation of the growth of carbon nanofilaments over a wide temperature range
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Carbon nanofilaments could be formed on silicon oxide substrates over a wide temperature range of 350-1050°C by a thermal chemical vapor deposition system. Using a vacuum-sublimation method, we deposited Fe metal catalyst nanograins on the substrate and carried out carbon nanofilament depositions as a function of the substrate temperature. The diameters of the carbon nanofilaments increased at a higher substrate temperature range. At 350°C, the diameters of carbon nanofilaments were measured to be around 50 nm. At 850°C, however, they seemed to be above 150 nm. Above 850°C, the carbon nanofilaments seemed to be transformed into amorphous carbon. The cause for the variation of the carbon nanofilament diameter as a function of temperature is discussed in association with the surface migration of Fe metal catalyst nanograins and their agglomeration.
Abstract
Carbon nanofilaments could be formed on silicon oxide substrates over a wide temperature range of 350-1050°C by a thermal chemical vapor deposition system. Using a vacuum-sublimation method, we deposited Fe metal catalyst nanograins on the substrate and carried out carbon nanofilament depositions as a function of the substrate temperature. The diameters of the carbon nanofilaments increased at a higher substrate temperature range. At 350°C, the diameters of carbon nanofilaments were measured to be around 50 nm. At 850°C, however, they seemed to be above 150 nm. Above 850°C, the carbon nanofilaments seemed to be transformed into amorphous carbon. The cause for the variation of the carbon nanofilament diameter as a function of temperature is discussed in association with the surface migration of Fe metal catalyst nanograins and their agglomeration.