Fe-Substituted Mullite Powders for the In Situ Synthesis of Carbon Nanotubes by Catalytic Chemical Vapor Deposition

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• 作者：Valdirene G. de Resende ; Xu Hui ; Christophe Laurent ; Alicia Weibel ; Eddy De Grave ; Alain Peigney
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：July 2, 2009
• 年：2009
• 卷：113
• 期：26
• 页码：11239-11245
• 全文大小：455K
• 年卷期：v.113,no.26(July 2, 2009)
• ISSN：1932-7455

文摘

Powders of iron-substituted mullite were prepared by combustion and further calcination in air at different temperatures. A detailed study involving notably Mssbauer spectroscopy showed that the Fe³⁺ ions are distributed between the mullite phase and a corundum phase that progressively dissolves into mullite upon the increase in calcination temperature. Carbon nanotube−Fe−mullite nanocomposites were prepared for the first time by a direct method involving a reduction of these powders in H₂−CH₄ and without any mechanical mixing step. The carbon nanotubes formed by the catalytic decomposition of CH₄ on the smallest metal particles are mostly double-walled and multiwalled, although some carbon nanofibers are also observed.