Commensurate Growth of Densely Packed PTCDI Islands on the Rutile TiO2(110) Surface

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• 作者：Valeria Lanzilotto ; Giacomo Lovat ; Gonzalo Otero ; Laura Sanchez ; Maria Francisca L贸pez ; Javier M茅ndez ; Jos茅 A. Mart铆n-Gago ; Gregor Bavdek ; Luca Floreano
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：June 20, 2013
• 年：2013
• 卷：117
• 期：24
• 页码：12639-12647
• 全文大小：446K
• 年卷期：v.117,no.24(June 20, 2013)
• ISSN：1932-7455

文摘

We have studied the deposition of perylene-tetracarboxylic-diimide, PTCDI, on the rutile (1 脳 1)-TiO₂(110) surface. At variance with other polyaromatic hydrocarbons, like acenes, PTCDI displays a significant interaction with this dielectric substrate. At moderate substrate temperature (400 K), first layer molecules aggregate into two-dimensional islands corresponding to a (1 脳 5) commensurate phase. According to our surface diffraction, STM, and NEXAFS studies, the substrate accommodates one PTCDI molecule per unit cell, atop each oxygen row. Because of steric repulsion, molecules lie on their long edge, tilted by 35掳 with respect to the surface. This constraint determines a strong 蟺鈥撓€ coupling between adjacent molecules, resulting into a geometry similar to that reported for acenes on (1 脳 1)-TiO₂(110), but quite uncommon for perylenes.