Effect of Catalyst Pretreatment on Chirality-Selective Growth of Single-Walled Carbon Nanotubes

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• 作者：Martin Fouquet ; Bernhard C. Bayer ; Santiago Esconjauregui ; Christian Thomsen ; Stephan Hofmann ; John Robertson
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：March 20, 2014
• 年：2014
• 卷：118
• 期：11
• 页码：5773-5781
• 全文大小：629K
• 年卷期：v.118,no.11(March 20, 2014)
• ISSN：1932-7455

文摘

We show that catalyst pretreatment conditions can have a profound effect on the chiral distribution in single-walled carbon nanotube chemical vapor deposition. Using a SiO₂-supported cobalt model catalyst and pretreatment in NH₃, we obtain a comparably narrowed chiral distribution with a downshifted tube diameter range, independent of the hydrocarbon source. Our findings demonstrate that the state of the catalyst at the point of carbon nanotube nucleation is of fundamental importance for chiral control, thus identifying the pretreatment atmosphere as a key parameter for control of diameter and chirality distributions.