Lateral force microscope and linear-scan voltammetry studies on the replacement of adsorbed thiolates on Au with thiols in solution

Yong Kwan Kim, Jae Pil Koo, Jeong Sook Ha

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Replacement of self-assembled octanethiolates (OT) on Au with carboxyl-terminated 11-mercaptoundecanoic acid (MUA) in solution was investigated. Lateral force microscope (LFM), which can distinguish the surface areas covered with molecules of different functional groups, was combined with the μ-contact printing technique to study the time dependent replacement reaction. The LFM image of the OT and MUA pattern was deteriorated with the replacement. As the replacement proceeded, the reductive desorption peak of OT continuously shifted towards the position of MUA in the linear-scan voltammogram. Within 50 h in MUA solution, more than 60% of OT molecules on Au were replaced by MUA while the reverse process, replacement of MUA with OT, occurred much more slowly. This confirms the higher stability of MUA self-assembled monolayer (SAM) than OT SAM.

Original languageEnglish
Pages (from-to)277-281
Number of pages5
JournalThin Solid Films
Volume479
Issue number1-2
DOIs
Publication statusPublished - 2005 May 23

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Keywords

  • Lateral force microscope
  • Linear-scan voltammetry
  • Replacement of self-assembled molecules
  • Stability of SAM
  • μ-Contact printing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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