Replacement of adsorbed alkanethiolate on Au with carboxyl-terminated thiol in solution: Effect of alkyl chain length

Yong Kwan Kim, Jae Pil Koo, Jeong Sook Ha

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We have investigated the effect of the alkyl chain length on the replacement of the self-assembled alkanethiolate on Au surface with carboxyl-terminated thiol dissolved in solution. Immersion time-dependent replacement of self-assembled alkanethiolates on Au substrate was monitored by lateral force microscope (LFM), contact angle measurement, and infrared spectroscopy (IRS). Both the self-assembled monolayers (SAM) of 1-octadecanethiol (ODT) and octanethiol (OT) were reacted with carboxyl-terminated 11-mercaptoundecanoic acid (MUA) molecules in ethanol. OT SAM was rapidly replaced by MUA molecules. More than 50% of OT molecules were replaced by MUA within the initial 50 h. In contrast, less than 10% of ODT molecules were replaced by MUA within the same time scale. This can be explained in terms of the relative stability between methyl- and carboxyl-terminated thiolates on Au surface, depending upon the chain length and the lateral hydrogen bonding.

Original languageEnglish
Pages (from-to)7-11
Number of pages5
JournalApplied Surface Science
Volume249
Issue number1-4
DOIs
Publication statusPublished - 2005 Aug 15

Fingerprint

Chain length
Sulfhydryl Compounds
thiols
acids
Molecules
Acids
Self assembled monolayers
molecules
Angle measurement
submerging
Contact angle
Infrared spectroscopy
Hydrogen bonds
Microscopes
Ethanol
ethyl alcohol
infrared spectroscopy
microscopes
11-mercaptoundecanoic acid
Substrates

Keywords

  • μ-Contact printing
  • Lateral force microscope
  • Replacement
  • Self-assembled monolayer
  • Stability of SAM

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

Replacement of adsorbed alkanethiolate on Au with carboxyl-terminated thiol in solution : Effect of alkyl chain length. / Kim, Yong Kwan; Koo, Jae Pil; Ha, Jeong Sook.

In: Applied Surface Science, Vol. 249, No. 1-4, 15.08.2005, p. 7-11.

Research output: Contribution to journalArticle

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