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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Substituent-Dependent Ordering of Adlayer Structures of Fullerene Derivatives Adsorbed on Au(111): A Scanning Tunneling Microscopy Study
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Substituent-Dependent Ordering of Adlayer Structures of Fullerene Derivatives Adsorbed on Au(111): A Scanning Tunneling Microscopy Study

机译：吸附在Au（111）上的富勒烯衍生物的附加结构的取代基依赖性有序化：扫描隧道显微镜研究

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摘要

The adsorption of four fullerene derivatives, including Re(C_(60)Me5)(CO)3, Ru(C_(60)Ph5)Cp, C_(60)(C6H4C6H4-COOH)5Me, and C_(60)(C6H4-CC-SiM2C_(12)H_(25))5Me, on a Au(111) surface has been investigated by scanning tunneling microscopy (STM) and cyclic voltammetry. High-resolution STM images reveal that Re(C_(60)Me5)(CO)3 forms a well-ordered (2√3 x 2√3)R30° structure. Different from C_(60) on Au(111), the so-called "in-phase" structure is not found with the attachment of methyl and Re(CO)3 groups. With the increase of substituent size, disordered adlayers have been observed for Ru(C_(60)Ph5)Cp and C_(60)(C6H4C6H4-COOH)5Me. However, the individual molecules could be distinguished in STM images, suggesting that the two molecules interact strongly with the Au(111) surface. When the substituent size is further increased, a multilayered structure is formed for C_(60)(C6H4-CC-SiMe2C_(12)H_(25))5Me. This is because of molecular aggregation in the bulk solution, which occurs at very low concentration. These results indicate that the structures of fullerene derivatives play an essential role in adlayer formation through adjusting molecule-substrate and molecule-molecule interactions.
机译：四种富勒烯衍生物的吸附，包括Re（C_（60）Me5）（CO）3，Ru（C_（60）Ph5）Cp，C_（60）（C6H4C6H4-COOH）5Me和C_（60）（C6H4-通过扫描隧道显微镜（STM）和循环伏安法研究了Au（111）表面上的CC-SiM2C_（12）H_（25））5Me。高分辨率STM图像显示Re（C_（60）Me5）（CO）3形成有序的（2√3x2√3）R30°结构。与Au（111）上的C_（60）不同，没有发现带有甲基和Re（CO）3基团的所谓“同相”结构。随着取代基尺寸的增加，已观察到Ru（C_（60）Ph5）Cp和C_（60）（C6H4C6H4-COOH）5Me的无序吸附层。但是，可以在STM图像中区分单个分子，表明这两个分子与Au（111）表面强烈相互作用。当取代基尺寸进一步增加时，对于C_（60）（C6H4-CC-SiMe2C_（12）H_（25））5Me形成多层结构。这是因为在本体溶液中的分子聚集是在非常低的浓度下发生的。这些结果表明，富勒烯衍生物的结构通过调节分子-底物和分子-分子的相互作用，在吸附层的形成中起着至关重要的作用。

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