The Role of C2 in Low Temperature Growth of Carbon Nanofibers
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概要
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The synthesis of carbon nanofibers at low temperature was performed by plasma-enhanced chemical vapor deposition using a low-temperature CO/Ar/O2 DC plasma without any catalyst materials. At the optimum oxygen concentration of O2/CO = 0.002–0.005, vertically aligned CNFs can be synthesized at temperature as low as 90°C. In order to clarify the importance of C2 molecules in the present CNFs growth process, the correlations among emission intensities of C and C2 and CNFs growth rates have been evaluated for various O2/CO ratio. Although the emission intensity of C atom spectra was not influenced by the addition of oxygen, the emission intensity of C2 HP band decreased drastically with increasing additional oxygen fraction. From the comparison of growth rates of CNFs and optical emission spectroscopic results, it was concluded that C2 molecules play an important role as the main precursors of CNFs synthesis process in this system because the reduction tendencies of CNFs growth rates and C2 high-pressure bands emission intensity show a good correlation toward O2/CO ratio.
著者
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SUZUKI Masaaki
Department of Chemical Engineering, Tokyo Institute of Technology
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Suzuki Masaaki
Department Of Atherosclerosis Metabolism And Clinical Nutrition National Cardiovascular Center
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Mori Shinsuke
Department Of Chemical Engineering Graduate School Of Science And Engineering Tokyo Institute Of Tec
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