Self-assembly of two-dimensional nanoclusters observed with STM: From surface molecules to surface superstructure

Canhua Liu, Iwao Matsuda, Marie D'Angelo, Shuji Hasegawa, Jun Okabayashi, Satoshi Toyoda, Masaharu Oshima

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

A type of stable and identical two dimensional (2D) Au nanoclusters are discovered to exist on the Si(111)-3×3-Ag surface at submonolayer Au coverage. Self-assembly of these Au nanoclusters leads to a 2D superstructure Si(111)-21×21-(Ag+Au). This discovery helps us to obtain definite evidence that all the previously proposed atomic structure models for the 21×21 structure can be excluded. A model in which three Au adatoms locate on Ag triangles in the 21×21 unit cell is built based on the low-temperature scanning tunneling microscopy observations. Additionally, the stability and the uniformity of the Au nanocluster are discussed in terms of a substrate-mediated interaction among the Au adatoms, and the self-assembling process is understood by analogizing the Au nanocluster with a kind of surface molecule.

Original languageEnglish
Article number235420
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number23
DOIs
Publication statusPublished - 2006 Dec 20
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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