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Potential- and concentration-dependent self-assembly structures at solid/liquid interfaces

机译：潜在的——和浓度在固体/液体自组装结构接口

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摘要

We report the potential and concentration controlled assembly of an alkyl-substituted benzo[1,2-b: 4,5-b'] dithiophene (DDBDT) on an Au(111) electrode by in situ electrochemical scanning tunneling microscopy (ECSTM). It is found that a lamellar structure is formed at low concentrations, while herringbone-like and rhombus structures are obtained at high concentrations. In situ STM results reveal that herringbone-like and rhombus structures could transform into lamellar structures when the electrode potential is tuned negatively. A phase diagram is obtained to illustrate the relationship and effects of concentration and substrate potential on the interfacial structures of DDBDT. Both the substrate potential and the solute concentration can modulate the self-assembly structure through changing the molecular surface density. The results provide important insights into the understanding and precise control of molecular self-assembly on solid surfaces through a combination of different approaches.
机译：我们报告的潜力和浓度控制组装的单环烷基苯并[1、2 b: 4、5 b '] dithiophene (DDBDT)上非盟(111)通过原位电化学电极扫描隧道显微镜(ECSTM)。发现,层状结构形成在低浓度,而herringbone-like和菱形结构在高浓度。herringbone-like和菱形结构当转变成层状结构电极电位是消极的。图是说明获得的关系和浓度的影响基质势的界面结构DDBDT。溶质浓度可以调节通过改变自组装结构分子表面密度。重要的理解和洞察分子自组装的精确控制通过组合不同的固体表面方法。

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