Molecular Orientation and Aggregation of Titanyl Phthalocyanine Molecules on Graphite Substrates: Effects of Surface Topography of the Substrate
Molecular Orientation and Aggregation of Titanyl Phthalocyanine Molecules on Graphite Substrates: Effects of Surface Topography of the Substrate
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DOI：
10.1143/jjap.40.783
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发表时间：
2001-02
影响因子：
1.5
通讯作者：
S. Kera;K. Okudaira;Y. Harada;N. Ueno
中科院分区：
文献类型：
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作者：
S. Kera;K. Okudaira;Y. Harada;N. Ueno
潘宁电离电子能谱（PIES）用于研究基底表面晶体学缺陷对有机超薄膜生长的影响。对于在石墨上蒸发的钛氧基酞菁（OTiPc），发现薄膜中的分子取向和聚集显着取决于石墨基材的类型。在高取向热解石墨（HOPG）上，通过单层等效（MLE）沉积制备的OTiPc薄膜由双层岛组成，而在Grafoil上，分子不会像HOPG上那样聚集，而是形成单层。这种巨大的差异源于两种石墨基板的表面形貌。
Penning ionization electron spectroscopy (PIES) was used to investigate the effects of crystallographic inperfection of the substrate surface on organic ultrathin-film growth. For titanyl phthalocyanine (OTiPc) evaporated on graphite, it was found that the molecular orientation and aggregation in the film depend significantly on the type of graphite substrate. On a highly oriented pyrolytic graphite (HOPG), OTiPc film prepared by 1-monolayer-equivalence (MLE) deposition consists of islands of double layers, while on Grafoil, the molecules do not aggregate as on the HOPG, and form a monolayer. This large difference originated from the surface topography of the two graphite substrates.