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Effects of time on the quality of vertically oriented single-walled carbon nanotubes by gravity-assisted chemical vapour deposition

机译：时间对重力辅助化学气相沉积法对垂直取向单壁碳纳米管质量的影响

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摘要

The qualities of freestanding single-walled carbon nanotubes ( SWCNTs) grown on Co/Si( 100) in the gravity-assisted chemical vapour deposition ( CVD) process have been investigated. Vertically oriented SWCNTs of high quality appear at a growth time of less than 3 min, verified by the clear radial breathing mode ( RBM) in the Raman spectra and by the high resolution images taken by a transmission electron microscope ( TEM). At a growth time of 3 min, vertical and looped SWCNTs co-appear on the substrate. A SWCNT longer than similar to 1 mu m tends to bend into a semicircular loop. At a longer growth time such as 20 min, the coating of amorphous carbon ( a-C) on the SWCNT becomes dominant, which is attributed to catalytic poisoning. A relatively long SWCNT (similar to 10-40 mu m) surrounded with a thick a-C layer is the final structure. The bending stiffness of the a-C tube is estimated similar to 15 times larger than that of the SWCNT, which helps to keep the a-C/SWCNT composite structure in a nearly vertical shape. A mechanism has been proposed to explain the coating of a-C on SWCNTs.
机译：研究了在重力辅助化学气相沉积（CVD）过程中在Co / Si（100）上生长的独立式单壁碳纳米管（SWCNT）的质量。高质量的垂直取向SWCNT在不到3分钟的生长时间内出现，这已通过拉曼光谱中的清晰径向呼吸模式（RBM）以及通过透射电子显微镜（TEM）拍摄的高分辨率图像进行了验证。在3分钟的生长时间内，垂直和环状SWCNT共同出现在基板上。大于约1微米的SWCNT倾向于弯曲成半圆形环。在更长的生长时间（例如20分钟），SWCNT上的无定形碳（a-C）涂层占主导地位，这归因于催化中毒。最终结构是一个较长的SWCNT（约10-40微米），周围是厚厚的a-C层。估计a-C管的弯曲刚度大约是SWCNT的15倍，这有助于将a-C / SWCNT复合结构保持在近似垂直的形状。已经提出了一种机理来解释a-C在SWCNT上的涂层。

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