Voltammetric detection of the surface diffusion of adsorbed thiolate molecules in artificially phase-separated binary self-assembled monolayers on a Au(111) surface

Shinichiro Imabayashi, Daisuke Hobara, Takashi Kakiuchi

Research output: Contribution to journalArticle

53 Citations (Scopus)

Abstract

Surface diffusion of adsorbed alkanethiolate molecules forming a binary self-assembled monolayer (SAM) on Au(111) has been studied by monitoring the change in the shape of voltammograms for the reductive desorption of adsorbed thiolates. Artificially phase-separated SAMs of undecanethiol (UDT) and mercaptoundecanoic acid (MUA), which would form homogeneously mixed binary SAMs at the thermodynamic adsorption equilibrium, are prepared starting from the phase-separated binary SAMs composed of mercaptopropionic acid (MPA) and UDT, followed by the electrochemical partial desorption of the MPA domains and successive adsorption of MUA from ethanol to the domains originally occupied by MPA molecules. The mutual dissolution of UDT and MUA on the gold surface is monitored as the gradual merging of the initially well-separated two peaks on the voltammogram of reductive desorption of the thiolates. The average diffusion coefficient of adsorbed UDT and MUA at 60 °C in water is estimated to be about 10-18 cm2 s-1.

Original languageEnglish
Pages (from-to)2560-2563
Number of pages4
JournalLangmuir
Volume17
Issue number9
Publication statusPublished - 2001 May 1
Externally publishedYes

Fingerprint

Surface diffusion
Self assembled monolayers
surface diffusion
acids
Molecules
Acids
molecules
Desorption
desorption
Adsorption
adsorption
Merging
Gold
dissolving
Dissolution
Ethanol
ethyl alcohol
diffusion coefficient
Thermodynamics
gold

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Voltammetric detection of the surface diffusion of adsorbed thiolate molecules in artificially phase-separated binary self-assembled monolayers on a Au(111) surface. / Imabayashi, Shinichiro; Hobara, Daisuke; Kakiuchi, Takashi.

In: Langmuir, Vol. 17, No. 9, 01.05.2001, p. 2560-2563.

Research output: Contribution to journalArticle

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