Adsorption behavior of binary mixed alkanethiol molecules on Au: Scanning tunneling microscope and linear-scan voltammetry investigation

Yong Kwan Kim, Jae Pil Koo, Chul Joon Huh, Jeong Sook Ha, Ung Hwan Pi, Sung Yool Choi, Jun Ho Kim

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Adsorption behavior of binary mixed alkanethiol molecules of octanethiol (OT) and dodecanethiol (DDT) on Au substrate has been investigated with a variation of molar fraction in solution at room temperature. Linear-scan voltammograms (LSV) taken from the binary mixed self-assembled monolayer (SAM) on Au/Si showed a single reductive desorption peak, continuously shifting with a variation of mixing ratio in solution. Molecule-resolved scanning tunneling microscope (STM) images obtained from the binary SAM on Au/mica showed the phase separation with a few nanometer sized domains. The difference in the chain length between OT and DDT was not large enough to induce the phase separation with much larger domains, which could be well detected by LSV. There was no preferential adsorption of DDT to OT.

Original languageEnglish
Pages (from-to)4951-4956
Number of pages6
JournalApplied Surface Science
Volume252
Issue number14
DOIs
Publication statusPublished - 2006 May 15

Keywords

  • Adsorption behavior
  • Binary self-assembled monolayer
  • Linear-scan voltammetry
  • Phase separation
  • Scanning tunneling microscope

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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