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http://dx.doi.org/10.5012/bkcs.2010.31.04.901

Coexistence of Closely Packed c(4 × 2) and Striped Phases in Self-Assembled Monolayers of Decylthiocyanates on Au(111)  

Choi, Young-Sik (Department of Chemistry and Research Institute for Natural Sciences, Hanyang University)
Kang, Hun-Gu (Department of Chemistry and Research Institute for Natural Sciences, Hanyang University)
Choi, In-Chang (Department of Chemistry and Research Institute for Natural Sciences, Hanyang University)
Lee, Nam-Suk (Department of Chemistry and Research Institute for Natural Sciences, Hanyang University)
Cho, Jun-Hyung (Department of Physics, Hanyang University)
Jang, Chang-Hyun (College of Bionano Technology, Kyungwon University)
Noh, Jaeg-Eun (Department of Chemistry and Research Institute for Natural Sciences, Hanyang University)
Publication Information
Bulletin of the Korean Chemical Society / v.31, no.4, 2010 , pp. 901-904 More about this Journal
Abstract
Decylthiocyanate (DTC) self-assembled monolayers (SAMs) on Au(111) were prepared by solution and vapor phase deposition methods at $50^{\circ}C$ for 24 h. The formation and surface structure of DTC SAMs were examined using scanning tunneling microscopy (STM). STM imaging revealed that DTC SAMs formed in 1 mM ethanol solution at $50^{\circ}C$ were composed of small ordered domains with lateral dimensions of a few nanometers and disordered phases, whereas DTC SAMs formed in the vapor phase at $50^{\circ}C$ contained two ordered phases: a closely packed c($4{\times}2$) superlattice and a striped phase with an interstripe spacing of 2.6 - 2.8 nm. It was also found that the ordered domain and vacancy island formation for DTC SAMs on Au(111) differs significantly from that of decanethiol SAMs, suggesting that adsorption mechanism is different from each other. From this study, it was confirmed that DTC SAMs with a high degree of structural order can be obtained by vapor phase deposition.
Keywords
Decylthiocyanate; Self-assembled monolayers; Scanning tunneling microscopy; Structural order; Vapor deposition;
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