Potential- and concentration-dependent self-assembly structures at solid/liquid interfaces
Potential- and concentration-dependent self-assembly structures at solid/liquid interfaces
复制标题
固/液界面处的电势和浓度依赖性自组装结构
DOI：
10.1039/c7nr08475g
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发表时间：
2018-02-21
期刊：
影响因子：
6.7
通讯作者：
Wan, Li-Jun
中科院分区：
文献类型：
--
作者：
Cai, Zhen-Feng;Yan, Hui-Juan;Wan, Li-Jun
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.
