Covalently Attached Monolayers on Crystalline Hydrogen-Terminated Silicon: Extremely Mild Attachment by Visible Light

Q.Y. Sun, L.C.P.M. de Smet, B. van Lagen, M. Giesbers, P.C. Thüne, J. van Engelenburg, F.A. de Wolf, H. Zuilhof, E.J.R. Sudhölter

Research output: Contribution to journalArticleAcademicpeer-review

203 Citations (Scopus)

Abstract

A very mild method was developed for the attachment of high-quality organic monolayers on crystalline silicon surfaces. By using visible light sources, from 447 to 658 nm, a variety of 1-alkenes and 1-alkynes were attached to hydrogen-terminated Si(100) and Si(111) surfaces at room temperature. The presence and the quality of the monolayers were evaluated by static water contact angles, X-ray photoelectron spectroscopy, and IR spectroscopy. Monolayers prepared by thermal, UV light, or visible light initiation were compared. Additionally, the ability of infrared reflection-absorption spectroscopy to study organic monolayers on silicon was explored. A reaction mechanism is discussed on the basis of investigations of the reaction behavior of 1-alkenes with silicon wafers with varying types and levels of doping. Finally, a series of mixed monolayers derived from the mixed solutions of a 1-alkene and an -fluoro-1-alkene were investigated to reveal that the composition of the mixed monolayers was directly proportional to the molar ratio of the two compounds in the solutions.
Original languageEnglish
Pages (from-to)2514-21523
JournalJournal of the American Chemical Society
Volume127
Issue number8
DOIs
Publication statusPublished - 2005

Keywords

  • self-assembled monolayers
  • alkyl monolayers
  • porous silicon
  • organic monolayers
  • si(111) surface
  • alkanethiolate monolayers
  • functionalized monolayers
  • mediated hydrosilylation
  • chemical-modification
  • nitride surfaces

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