Coexistence of closely packed c(4 × 2) and striped phases in self-assembled monolayers of decylthiocyanates on Au(111)

Youngsik Choi, Hungu Kang, Inchang Choi, Nam Suk Lee, Jun Hyung Cho, Chang Hyun Jang, Jaegeun Noh

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Decylthiocyanate (DTC) self-assembled monolayers (SAMs) on Au(111) were prepared by solution and vapor phase deposition methods at 50 °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 °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 °C contained two ordered phases: a closely packed c(4 × 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.

Original languageEnglish
Pages (from-to)901-904
Number of pages4
JournalBulletin of the Korean Chemical Society
Volume31
Issue number4
DOIs
StatePublished - 2010 Apr 20

Keywords

  • Decylthiocyanate
  • Scanning tunneling microscopy
  • Self-assembled monolayers
  • Structural order
  • Vapor deposition

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