Adsorption of Co-Phthalocyanine on the Rutile TiO2(110) Surface: A Scanning Tunneling Microscopy/Spectroscopy Study
Adsorption of Co-Phthalocyanine on the Rutile TiO2(110) Surface: A Scanning Tunneling Microscopy/Spectroscopy Study
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DOI：
10.1021/jp303152c
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发表时间：
2012-09-27
影响因子：
3.7
通讯作者：
Fujita, Daisuke
中科院分区：
文献类型：
--
作者：
Ishida, Nobuyuki;Fujita, Daisuke
利用扫描隧道显微镜和光谱分析技术研究了钴酞菁在金红石型二氧化钛(110)表面的吸附行为。分析结果表明，吸附性能强烈地依赖于沉积条件。在特定的沉积条件下(较高的衬底温度和较低的沉积速率)，分子固定在表面上，没有聚集，直到完全覆盖单层。底物温度在决定分子与底物之间的成键性质方面起着关键作用。固载的分子在界面处引入能带态，使表面带隙局部减小到低于CoPC薄膜吸收带的能量值。覆盖度依赖研究表明，第一单分子层生长时，吸附结构主要由分子-衬底相互作用主导，第二单分子膜生长时，第一和第二单分子层中分子间的复杂相互作用占主导地位。
We investigated the adsorption properties of Co-phthalocyanines (CoPc's) on the rutile TiO2(110) surface using scanning tunneling microscopy and spectroscopy. Analytical results showed that the adsorption properties strongly depend on the deposition conditions. Under specific deposition conditions (elevated substrate temperatures and low deposition rates), the molecules are immobilized on the surface without aggregation up to the full monolayer coverage. The substrate temperature plays a key role in determining the bonding nature between the molecules and the substrate. The immobilized molecules introduce gap states at the interface and locally decrease the surface band gap to an energy value that is lower than that of the absorption band of the CoPc thin film. Coverage dependence studies show that the adsorption structures are dominated by molecule-substrate interactions for the first monolayer growth and by a complex interaction between molecules in the first and second monolayers for the second monolayer growth.