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- W2011102786 abstract "Multi-wall carbon nanotubes have been synthesized by plasma enhanced chemical vapor deposition (CVD) on Co-coated silicon substrates. Prior to the deposition of carbon nanotubes, dense and uniform nanosized catalytic seeds were formed by hydrogen plasma treatment on Co thin film. The size and morphology of Co catalytic seeds varied with hydrogen plasma treatment time. In the carbon nanotube growing process, a mixture of CH4 and H2 was used as gas source. Small O2 additions to the CH4–H2 gas mixture (0∼12% of mixture gas) improved the purity of carbon nanotubes and surprisingly led to high quality even at low growth temperature (610°C) as observed in high-resolution transmission electron microscopy (HRTEM). In order to understand the growth process by CH4–H2–O2 plasma CVD in detail, optical emission spectroscopy (OES) was introduced. The results of OES analysis showed that, with the increase of oxygen amount, the intensity of C2 decreased gradually, but the intensity of the OH radical increased sharply. It probably leads to increasing the etching effect on defective structure by affluent OH radical and suppressing super-saturation of carbon molecules at growing edges." @default.
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- W2011102786 date "2002-01-01" @default.
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- W2011102786 title "Hydrogen plasma treatment on catalytic layer and effect of oxygen additions on plasma enhanced chemical vapor deposition of carbon nanotube" @default.
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- W2011102786 doi "https://doi.org/10.1016/s0925-8388(01)01599-7" @default.
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