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Potential and concentration-dependent self-assembly structure at solid/liquid interface


We report a potential and concentration controlled assembly of a alkyl-substituted benzo[1,2-b:4,5-b’]dithiophene (DDBDT) on 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 structure 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 substrate potential and 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 combination of different approaches.

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Publication details

The article was received on 14 Nov 2017, accepted on 12 Jan 2018 and first published on 12 Jan 2018

Article type: Paper
DOI: 10.1039/C7NR08475G
Citation: Nanoscale, 2018, Accepted Manuscript
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    Potential and concentration-dependent self-assembly structure at solid/liquid interface

    Z. Cai, H. Yan, D. Wang and L. Wan, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C7NR08475G

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