Number of Walls Controlled Synthesis of Millimeter-Long Vertically Aligned Brushlike Carbon Nanotubes

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• 作者：Supriya Chakrabarti ; Hideki Kume ; Lujun Pan ; Takeshi Nagasaka ; Yoshikazu Nakayama
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：February 8, 2007
• 年：2007
• 卷：111
• 期：5
• 页码：1929 - 1934
• 全文大小：470K
• 年卷期：v.111,no.5(February 8, 2007)
• ISSN：1932-7455

文摘

Millimeter (mm) long vertically aligned carbon nanotubes (CNTs) were grown by the catalyst assisted thermalchemical vapor deposition (CVD) technique. The continuous growth of CNTs as long as 7 mm was observedafter 12 h of deposition by adjusting the growth parameters for making the catalyst active for a long time.The direct dependence of the number of walls of mm-long CNTs on the Fe catalyst thickness was observed.The successful syntheses of single-walled nanotubes (SWNTs), double-walled nanotubes (DWNTs), andmultiwalled nanotubes (MWNTs) with high percentages (~80%) were achieved by varying the catalyst layerthickness. The effect of Al₂O₃ buffer layer was found to be critical for this controlled synthesis, which hasbeen discussed in detail. The possible growth mechanism is also discussed to better understand this phenomenon.