Structure of alkanethiolate monolayers on Cu(100): Self-assembly on the four-fold-symmetry surface

Hiroshi Kondoh, N. Saito, F. Matsui, T. Yokoyama, T. Ohta, H. Kuroda

研究成果: Article

41 引用 (Scopus)

抄録

We have studied the structure and growth process of hexanethiolate self-assembled monolayers (SAMs) on Cu(100) by means of scanning tunneling microscopy (STM) and X-ray absorption fine structure (XAFS) spectroscopy. At saturated coverage, the thiolates are assembled into a c(2 × 6) structure with zigzag chains along the close-packed Cu rows. The sulfur atom of the thiolate occupies the 4-fold hollow site of the unreconstructed Cu(100) surface with a nearest-neighbor S-S distance of 3.6 Å. Such sulfur adsorption results in a large lattice mismatch between the S/Cu layer and the alkyl chain layer, since the interchain distance of the alkyl group is ca. 4.5 Å. However, it is reconciled by the internal degree of freedom for the S-C bond which bridges the two layers, as is confirmed by the geometrical optimization based on molecular force-field calculations. The SAM film formation is well-described by a two-step process; in the first step, a full-coverage monolayer is rapidly formed, which is characterized by a highly oriented but two-dimensionally disordered structure, followed by a much slower evolution to the c(2 × 6) structure with surface diffusion of the thiolate.

元の言語English
ページ(範囲)12870-12878
ページ数9
ジャーナルJournal of Physical Chemistry B
105
発行部数51
DOI
出版物ステータスPublished - 2001 12 27
外部発表Yes

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Self assembled monolayers
Sulfur
Self assembly
self assembly
Monolayers
X ray absorption fine structure spectroscopy
Lattice mismatch
Surface diffusion
Scanning tunneling microscopy
symmetry
sulfur
surface diffusion
Adsorption
Atoms
field theory (physics)
scanning tunneling microscopy
hollow
degrees of freedom
fine structure
optimization

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

これを引用

Structure of alkanethiolate monolayers on Cu(100) : Self-assembly on the four-fold-symmetry surface. / Kondoh, Hiroshi; Saito, N.; Matsui, F.; Yokoyama, T.; Ohta, T.; Kuroda, H.

:: Journal of Physical Chemistry B, 巻 105, 番号 51, 27.12.2001, p. 12870-12878.

研究成果: Article

Kondoh, Hiroshi ; Saito, N. ; Matsui, F. ; Yokoyama, T. ; Ohta, T. ; Kuroda, H. / Structure of alkanethiolate monolayers on Cu(100) : Self-assembly on the four-fold-symmetry surface. :: Journal of Physical Chemistry B. 2001 ; 巻 105, 番号 51. pp. 12870-12878.
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