Organosilane self-assembled multilayer formation based on activation of methyl-terminated surface with reactive oxygen species generated by vacuum ultra-violet excitation of atmospheric oxygen molecules

Young Jong Kim, Jiwon Han, Hikaru Sano, Kyung Hwang Lee, Kei Noda, Takashi Ichii, Kuniaki Murase, Kazumi Matsushige, Hiroyuki Sugimura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A xenon excimer lamp which irradiates vacuum ultra-violet (VUV) light at 172 nm in wavelength was applied to the photochemical surface conversion of n-octadecyltrimethoxysilane self-assembled monolayer (ODS-SAM) in the presence of atmospheric oxygen and subsequent multilayer fabrication. The terminal functional groups of ODS-SAM, -CH 3 groups, were converted into polar functional groups, like -COOH, by the reaction with atomic oxygen species generated photochemically through VUV excitation of atmospheric oxygen molecules. The structure of the resulting organosilane multilayer with different numbers of superimposed monolayers (from 1 to 11), prepared on a smooth and hydrophilic silicon substrate by the layer-by-layer (LbL) approach, was examined in terms of molecular organization as well as the intra- or interlayer binding modes in such novel films. Ellipsometry and grazing angle X-ray reflectivity measurements revealed that multilayer films of up to 11 discrete monolayers were successfully obtained, indicating that the self-assembly is a viable technique for the construction of relatively thick (16 nm and above) multilayer films.

Original languageEnglish
Pages (from-to)1507-1513
Number of pages7
JournalApplied Surface Science
Volume256
Issue number5
DOIs
Publication statusPublished - 2009 Dec 15
Externally publishedYes

Keywords

  • Active oxygen species
  • Layer-by-layer approach
  • Multilayer
  • Photochemical surface modification
  • Self-assembled monolayer (SAM)
  • Vacuum ultra-violet (VUV)

ASJC Scopus subject areas

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

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