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- W2069481059 abstract "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." @default.
- W2069481059 created "2016-06-24" @default.
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- W2069481059 date "2001-11-22" @default.
- W2069481059 modified "2023-10-16" @default.
- W2069481059 title "Structure of Alkanethiolate Monolayers on Cu(100): Self-Assembly on the Four-Fold-Symmetry Surface" @default.
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- W2069481059 doi "https://doi.org/10.1021/jp015517r" @default.
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