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Quaterrylene molecules on Ag(111): Self-assembly behavior and voltage pulse induced trimer formation

Abstract

The self-assembly behavior of quaterrylene (QR) molecules on Ag (111) surfaces has been investigated by scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. It is found that the QR molecules are highly mobile on the Ag(111) surfaceat 78 K.No ordered assembled structure is formed on the surface with sub-monolayer coverage up to 0.8 monolayerdue to the intermolecularrepulsive interactions,whereas ordered molecular structures are observed at one monolayer coverage.According to ourDFT calculations,charge transfer occurs between the substrate and the adsorbed QR molecule. As a result,out-of-plane dipoles appear at the interface, which are scribbled tothe repulsive dipole-dipole interactionsbetween the QR molecules. Furthermore, due to the planar geometry, QR molecules exhibitrelatively low diffusion barriers on Ag (111).By applying a voltage pulse between the tunneling gap, immobilization and aggregation of QR molecules takes place, resulting in the formation of triangle-shaped trimer. Our work demonstrates the ability of manipulating intermolecular repulsive and attractive interactions at the single-molecular level.

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Publication details

The article was received on 12 Feb 2018, accepted on 30 Mar 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8CP01005F
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Quaterrylene molecules on Ag(111): Self-assembly behavior and voltage pulse induced trimer formation

    L. Xu, Y. He, Z. Cai, J. Shao, L. She, Y. Zheng and D. Zhong, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C8CP01005F

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