Low-Temperature scanning tunneling microscopy investigation of bis(phthalocyaninato)yttrium growth on au(111): from individual molecules to two-dimensional domains

Yan Feng Zhang, Hironari Isshiki, Keiichi Katoh, Yusuke Yoshida, Masahiro Yamashita, Hitoshi Miyasaka, Brian Keith Breedlove, Takashi Kajiwara, Shinya Takaishi, Tadahiro Komeda

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

We show a 4.8 K STM observation of a double-decker bis(phthalocyaninato) yttrium (YPc2; Pc ) phthalocyanine) molecule adsorption on Au(111) substrate. An eight-lobed structure was imaged as the submolecule STM contrast of a single molecule both in an isolated state and in a molecule film. This feature arises from the top Pc group, where both sides of the four phenyl rings are highlighted. As an isolated molecule, the adsorption orientation is determined by the lower Pc, the diagonal axis of which aligns parallel to the close-packed direction of Au(111). In a 2D film, a near-square molecule lattice appears with a unit of ̃1.47 × 1.38 nm2, and one of the lattice vectors is rotated by ̃15° from the close-packed direction. A tentative model is provided to illustrate the molecule array where neighboring molecules are rotated by ̃30° from each other. In this way, the lower Pcs should align along the [101̄] and [2̄11] directions (or their equivalent directions) alternately. All these facts illustrate the molecule-substrate and the molecule-molecule interactions in the initial adsorption and in the film accumulation.

Original languageEnglish
Pages (from-to)9826-9830
Number of pages5
JournalJournal of Physical Chemistry C
Volume113
Issue number22
DOIs
Publication statusPublished - 2009 Jun 4

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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