Deposition and fabrication of alkanethiolate gold nanocluster films on TiO2(1 1 0) and the effects of plasma etching

Taketoshi Matsumoto, Patricia Nickut, Takeshi Sawada, Hironori Tsunoyama, Kazuya Watanabe, Tatsuya Tsukuda, Katharina Al-Shamery, Yoshiyasu Matsumoto

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Deposition and fabrication of films of Au nanoclusters protected by alkanethiolate ligands are attempted on a TiO2(1 1 0) surface and the structures of films are observed by a scanning tunneling microscope (STM). Effects of oxygen and hydrogen-plasma etching in addition to UV irradiation on the structure and chemical composition of the films are also investigated by using STM and X-ray photoelectron spectroscopy. Alkanethiolate Au nanoclusters are produced using a modified Brust synthesis method and their LB films are dip-coated on TiO2(1 1 0). Alkanethiolate Au nanoclusters are weakly bound to the substrate and can be manipulated with an STM tip. Net-like structures of alkanethiolate Au nanoclusters are formed by a strong blast of air. Oxygen-plasma etching removes alkanethiolate ligands and simultaneously oxidizes Au clusters. At room temperature, prolonged oxygen-plasma etching causes agglomeration of Au nanoclusters. UV irradiation removes ligands partly, which makes Au nanoclusters less mobile. The net-like structure of alkanethiolate Au clusters produced by a blast of air is retained after oxygen and hydrogen-plasma etching.

Original languageEnglish
Pages (from-to)5121-5126
Number of pages6
JournalSurface Science
Volume601
Issue number22
DOIs
Publication statusPublished - 2007 Nov 15

Keywords

  • Etching
  • Gold
  • Langmuir/Blodgett/Kuhn assemblies
  • Nanopatterning
  • Nanostructures
  • Scanning tunnelling microscopy
  • Titanium oxide
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

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

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