Construction of semiconductor nanoparticle layers on gold by self-assembly technique

Takuya Nakanishi, Bunsho Ohtani, Kohei Uosaki

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Cadmium sulfide (CdS) nanoparticles were prepared using the Aerosol-OT (AOT)/heptane inverse-micelle method. The particle size was controlled by changing the [H2O]/[AOT] ratio in the preparation process to be ca. 3 nm, which was estimated from their absorption maximum (ca. 385 nm) and absorption edge (ca. 450 nm) in heptane solutions. Self-assembled monolayers (SAMs) of α,ω-dithiols were prepared on (111)-oriented gold substrates. They were highly stable in aqueous solutions and showed a blocking effect toward electron exchange between the gold substrate and the electroactive species in the solution. Mono- and multi-layers of CdS nanoparticles were prepared by immersing the SAM-covered gold substrates in a heptane solution containing CdS particles. Infrared reflection-absorption spectra revealed that CdS particles on SAMs were surrounded by AOT and that a sequential immmersion procedure led to the alternately layered structure of CdS particles and dithiol molecules.

Original languageEnglish
Pages (from-to)4053-4056
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume36
Issue number6 SUPPL. B
Publication statusPublished - 1997 Jun
Externally publishedYes

Keywords

  • α,ω-dithiol
  • Aerosol-OT
  • Cadmium sulfide nanoparticle
  • Infrared reflection-absorption spectroscopy
  • Inverse micelle
  • Multi-layered structure
  • Self-assembled monolayer

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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