Characterization of self-assembled monolayers of alkanethiol on GaAs surface by contact angle and angle-resolved XPS measurements

Shen Ye, Guifeng Li, Hiroyuki Noda, Kohei Uosaki, Masatoshi Osawa

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

Self-assembled monolayers (SAMs) of alkanethiol molecules (CnH2n + 1SH, n=4, 8, 12, 18) have been constructed on a GaAs(100) surface in 5 mM alkanethiol/ethanol solutions with addition of ammonia (NH4OH). The contact angles of the GaAs surface modified by alkanethiol with longer chain (n≥12) were higher than 100° when the concentration of NH4OH in the modification solution was higher than 5%, showing a hydrophobic GaAs surface, which was covered by a well-ordered organic monolayer, was formed. Furthermore, the angle-resolved X-ray photoelectron spectroscopy measurements were carried out to determine chemical bonding, thickness and the tilt angle of the SAMs on the GaAs surface.

Original languageEnglish
Pages (from-to)163-170
Number of pages8
JournalSurface Science
Volume529
Issue number1-2
DOIs
Publication statusPublished - 2003 Apr 1

Keywords

  • Ammonia
  • Gallium arsenide
  • Self-assembly
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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