Self-Assembled Melamine Monolayer on Cu(111)

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• 作者：Yu-Pu Lin ; Oualid Ourdjini ; Luca Giovanelli ; Sylvain Clair ; Thomas Faury ; Younal Ksari ; Jean-Marc Themlin ; Louis Porte ; Mathieu Abel
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 16, 2013
• 年：2013
• 卷：117
• 期：19
• 页码：9895-9902
• 全文大小：415K
• 年卷期：v.117,no.19(May 16, 2013)
• ISSN：1932-7455

文摘

The self-assembled structure of melamine (1,3,5-triazine-2,4,6-triamine) deposited on Cu(111) was studied under ultra-high-vacuum conditions using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoemission spectroscopy (UPS). Molecular packing and conformation were investigated as a function of the annealing temperature. The molecules deposited at room temperature were found to be aligned with the molecular plane approximately perpendicular to the surface. At around 150 掳C, the molecules became aligned in a row-type structure and were all coupled to the Cu(111) surface. At still higher annealing temperatures, a new two-dimensional (2D) network was formed via the polymerization of the adsorbed monolayer of melamine. A multistep model consistent with STM, XPS, and UPS results is proposed, starting with a self-organized vertically adsorbed melamine monolayer and ending with the formation of a 2D network lying on Cu(111) interpreted as a ring-opening polymerization of melamine. The reactive Cu(111) surface is believed to be one of the keys in this multistep reaction.