Requirement on Aromatic Precursor for Graphene Formation

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• 作者：K. Gharagozloo-Hubmann ; N. S. Müller ; M. Giersig ; C. Lotze ; K. J. Franke ; S. Reich
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：May 12, 2016
• 年：2016
• 卷：120
• 期：18
• 页码：9821-9825
• 全文大小：317K
• 年卷期：0
• ISSN：1932-7455

文摘

We studied graphene growth from solid, aromatic precursors at low temperature (∼400 °C) on a metal surface via high vacuum (6 × 10^–6 mbar) chemical vapor deposition. A set of conjugated and condensed aromatic precursor molecules, i.e., structural isomers of terphenyl and anthracene are compared. While p-terphenyl and m-terphenyl were found to be excellent precursors for the formation of graphene, no graphene was obtained from o-terphenyl or anthracene. We propose a reaction mechanism that explains the differing growth products. The key requirement for the synthesis of graphene is a three-dimensional nature and suitable molecular structure of the precursor. Its incorporation into a flat aromatic system on a metal surface has to provide sufficient energy gain for the polymerization to occur.