A Spectroscopic and ab Initio Study of the Formation of Graphite and Carbon Nanotubes from Thermal Decomposition of Silicon Carbide

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• 作者：Giacomo Levita ; Luca Petaccia ; Alessio Comisso ; Silvano Lizzit ; Rosanna Larciprete ; Andrea Goldoni ; Alessandro De Vita
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：December 10, 2008
• 年：2008
• 卷：8
• 期：12
• 页码：4335-4341
• 全文大小：320K
• 年卷期：v.8,no.12(December 10, 2008)
• ISSN：1530-6992

文摘

We report an experimental and first-principles study of the thermal decomposition of 6H-SiC wafers, yielding graphite on the Si-terminated face and carbon nanotubes on the C-terminated face. The asymmetry of the carbon structure formation mechanisms is rationalized in terms of the different termination geometries of the opposite SiC faces. First-principles modeling reveals that horizontal, π-delocalized carbon structures form on the Si-terminated face. The bonding network geometry of the C-terminated face favors instead the formation of vertically oriented carbon structures, which can be interpreted as nanotube lateral wall precursors.