期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 32, 页码 18093-18098出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b05541
关键词
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资金
- Foundation for Fundamental Research on Matter (FOM), part of The Netherlands Organisation for Scientific Research (NWO)
- European Research Council [ERC-2012-StG 307760-SURFPRO]
- NWO (Chemical Sciences, VIDI) [700.10.424]
The self-assembly of 1,3,5-benzenetribenzoic acid (BTB) molecules on both Cu(111) and epitaxial graphene grown on Cu(111) were studied by scanning tunneling microscopy (STM) and, low-energy electron diffraction (LEED) under ultrahigh vacuum conditions. On Cu(111), the BTB molecules were found to mainly arrange in close-packed structures through H-bonding between the (partially) deprotonated carboxylic acid groups. In addition, porous structures formed by intact BTB molecules-and also based on H-bonding-were observed. On graphene grown on Cu(111) the BTB molecules mainly form porous structures accompanied by small patches of disordered close-packed structures. Upon annealing, BTB adsorbed on Cu(111) is fully deprotonated and arranges in the close-packed structure while in contrast on graphene/Cu(111) the porous network is exclusively formed. This shows that the molecular self-assembly behavior is highly dependent on the first substrate layer: one graphene layer is sufficient to considerably alter the interplay of molecule substrate and intermolecular interactions in favor of the latter interactions.
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