Nano-dot formation using self-assembled 3-mercaptopropionic acid thin films prepared by facile atmospheric-vapor-adsorption method on Au(1 1 1)

Tohru Nakamura, Ryota Kimura, Hideki Sakai, Masahiko Abe, Hiroshi Kondoh, Toshiaki Ohta, Mutsuyoshi Matsumoto

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Nanometer scale structures of self-assembled films consisting of 3-mercaptopropionic acid (MPA) were formed by using electric stimuli between scanning tunneling microscope (STM) Au tips and gold surfaces. The obtained structures were compared with those using bare gold surfaces and hexanethiol films on Au(1 1 1) under the same conditions. X-ray photoelectron spectroscopy measurements revealed that self-assembled ultrathin films of the corresponding thiol molecules were fabricated on Au(1 1 1) by a facile atmospheric-vapor-adsorption (AVA) method without solvent. Comparison of nano-structure formation suggested that the self-assembled thin films of 3-mercatopropionic acid molecules gave nano-dots below the height of voltage pulses where gold atom emission from Au tips and surface evaporation of Au(1 1 1) take place. It was found that 3-mercaptopropionic acid films easily produced much better nano-dots on Au(1 1 1) than hexanethiol films probably due to the formation of hydrogen bonding networks and/or the reactions of 3-mercaptopropionic acid when electric pulses were applied to the films.

Original languageEnglish
Pages (from-to)241-251
Number of pages11
JournalApplied Surface Science
Volume202
Issue number3-4
DOIs
Publication statusPublished - 2002 Dec 30
Externally publishedYes

Keywords

  • Atmospheric-vapor-adsorption method
  • Gold surface
  • Mercaptopropionic acid
  • Nano-dot
  • Nanometer scale dot
  • STM

ASJC Scopus subject areas

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

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