Incremental Variation in the Number of Carbon Nanotube Walls with Growth Temperature

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• 作者：Prasantha R. Mudimela ; Albert G. Nasibulin ; Hua Jiang ; Toma Susi ; Delphine Chassaing ; Esko I. Kauppinen
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：February 12, 2009
• 年：2009
• 卷：113
• 期：6
• 页码：2212-2218
• 全文大小：454K
• 年卷期：v.113,no.6(February 12, 2009)
• ISSN：1932-7455

文摘

Investigations of carbon nanotube (CNT) synthesis were carried out in a chemical vapor deposition reactor using CO as the carbon source, Fe as the catalyst material, and SiO₂ as the catalyst support. This allowed us to synthesize CNTs in a wide range of diameters from 1.4 to 12 nm and lengths from 0.5 to 350 μm. An incremental variation in the number of CNT walls, increasing from one to four, was found in the temperature range of 590−1070 °C. The increase in CNT wall number and CNT length with temperature can be explained by enhancement of carbon solubility and diffusivity. CO₂ was found to be a very important additive for the activation of catalyst particles and subsequently for the successful synthesis of CNTs. The prevention of cementite particle formation and etching amorphous carbon were also attributed to CO₂.