Visualization of Horizontally-Aligned Single-Walled Carbon Nanotube Growth with 13C/12C Isotopes

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• 作者：Hiroki Ago ; Naoki Ishigami ; Naoki Yoshihara ; Kenta Imamoto ; Seiji Akita ; Ken-ichi Ikeda ; Masaharu Tsuji ; Tatsuya Ikuta ; Koji Takahashi
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：February 14, 2008
• 年：2008
• 卷：112
• 期：6
• 页码：1735 - 1738
• 全文大小：427K
• 年卷期：v.112,no.6(February 14, 2008)
• ISSN：1932-7455

文摘

Horizontally aligned growth of single-walled carbon nanotubes (SWNTs) on single-crystal surfaces has attractedgreat interest in terms of nanoelectronic applications, but their growth mechanism is not fully understood.We report on the ¹³C/¹²C isotope-labeled growth of SWNTs on a sapphire surface to visualize their growthprocess. Switching carbon feedstock from ¹³CH₄ to ¹²CH₄ during SWNT growth induces a gradient distributionof the carbon isotopes along the tube axis. From the Raman mapping analysis, we succeeded to observe thegradual change in the isotope distribution of individual SWNTs. The results indicate the base-growth modefor the horizontally aligned SWNTs, which suggests that nanotube-sapphire interaction is essential toalignment. This method offers a unique technique to analyze the nanotube growth mechanism and kinetics.