Unusual self-assembly of chloroaluminium phthalocyanine on graphite

Hai yang Ma, Yan ling Zhao, Myo Win Zaw, Jin feng Jia*, Rui qin Zhang, M. A. VAN HOVE

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We report an unusual self-assembled layer structure of chloroaluminium phthalocyanine (ClAlPc) molecules on highly ordered pyrolytic graphite (HOPG), in which a close-packed well-ordered monolayer is separated from the substrate by a relatively disordered buffer layer, as revealed using scanning tunneling microscopy (STM). Our close-packed monolayer has a nearly rectangular lattice, instead of the distinctly different square lattice for the more commonly observed well-ordered bilayer structure. This may be due to the dominance of intermolecular interactions within the monolayer when the influence from the substrate is shielded by the buffer layer. Density Functional Theory (DFT) calculations and Reduced Density Gradient (RDG) analysis indicate that the dominant intermolecular interaction within the unusual layer is likely the London dispersion force.

Original languageEnglish
Pages (from-to)104-110
Number of pages7
JournalSurface Science
Volume681
DOIs
Publication statusPublished - Mar 2019

Scopus Subject Areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

User-Defined Keywords

  • 2D self-assembly
  • Dispersion forces
  • Weak interactions

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