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Peer-reviewedCC BYPhysical chemistry chemical physics : PCCP

Steering interfacial molecular structures by substrate-molecule charge transfer.

  • Benjamin Achatz1
  • Matthias Zeilerbauer1
  • Marco Thaler1
  • Milan Ončák2
  • Shadi Fatayer3
  • Laerte L Patera1
  1. 1Department of Physical Chemistry, University of Innsbruck, 6020 Innsbruck, Austria. [email protected].
  2. 2Department of Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria.
  3. 3Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
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Abstract

Intermixed self-assembled monolayers (SAMs) provide a powerful approach for tuning inorganic-organic interfaces, but their local structure and energetics often remain elusive. Here, an intermixed stripe phase of fullerene C₆₀ and Zn(II)-5,10,15,20-tetrakis(4-aminophenyl)porphyrin (Zn-TAPP) on a Ag(111) surface is identified, establishing a direct link between molecular assembly and charge transfer. Scanning tunnelling spectroscopy (STS) and Kelvin probe force spectroscopy (KPFS) have been used to map electronic states and local contact potential differences (LCPD). Compared to close-packed C₆₀ islands, the stripe phase exhibits a larger interfacial dipole and increased occupation of previously unoccupied C₆₀ states, consistent with enhanced charge transfer from Ag(111) to C₆₀. Analysis indicates that larger C₆₀ spacing in the stripe geometry reduces Coulomb repulsion, stabilizing the intermixed phase and enhancing charge transfer with respect to close-packed domains. These results provide direct evidence of charged C₆₀ molecules in stripe structures and guidelines for engineering intermixed SAMs with tailored interfacial electronic properties.

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Cite

BibTeXRIS
BibTeX
@article{achatz2026steering,
  title = {{Steering interfacial molecular structures by substrate-molecule charge transfer.}},
  author = {Benjamin Achatz and Matthias Zeilerbauer and Marco Thaler and Milan Ončák and Shadi Fatayer and Laerte L Patera},
  journal = {Physical chemistry chemical physics : PCCP},
  year = {2026},
  month = nov,
  doi = {10.1039/d6cp03153f},
  url = {https://europepmc.org/article/MED/42973279},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Steering interfacial molecular structures by substrate-molecule charge transfer.
AU  - Benjamin Achatz
AU  - Matthias Zeilerbauer
AU  - Marco Thaler
AU  - Milan Ončák
AU  - Shadi Fatayer
AU  - Laerte L Patera
PY  - 2026
DA  - 2026/11/03
JO  - Physical chemistry chemical physics : PCCP
DO  - 10.1039/d6cp03153f
UR  - https://europepmc.org/article/MED/42973279
AB  - Intermixed self-assembled monolayers (SAMs) provide a powerful approach for tuning inorganic-organic interfaces, but their local structure and energetics often remain elusive. Here, an intermixed stripe phase of fullerene C₆₀ and Zn(II)-5,10,15,20-tetrakis(4-aminophenyl)porphyrin (Zn-TAPP) on a Ag(111) surface is identified, establishing a direct link between molecular assembly and charge transfer. Scanning tunnelling spectroscopy (STS) and Kelvin probe force spectroscopy (KPFS) have been used to map electronic states and local contact potential differences (LCPD). Compared to close-packed C₆₀ islands, the stripe phase exhibits a larger interfacial dipole and increased occupation of previously unoccupied C₆₀ states, consistent with enhanced charge transfer from Ag(111) to C₆₀. Analysis indicates that larger C₆₀ spacing in the stripe geometry reduces Coulomb repulsion, stabilizing the intermixed phase and enhancing charge transfer with respect to close-packed domains. These results provide direct evidence of charged C₆₀ molecules in stripe structures and guidelines for engineering intermixed SAMs with tailored interfacial electronic properties.
SN  - 1463-9076
SN  - 1463-9084
ER  -