Interrupted-growth studies of the self-assembly of intrinsically acentric siloxane-derived monolayers

Milko E. Van Der Boom*, Guennadi Evmenenko, Chungjong Yu, Pulak Dutta, Tobin Jay Marks

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The evolution of an intrinsically acentric monolayer formed by self-assembly of a trimethoxysilane-functionalized, high-β azobenzene-based chromophore from solution onto hydrophilic silicon oxide surfaces shows two distinctly different adsorption steps. The kinetics of the monolayer formation on sodium lime glass and polished silicon were monitored ex situ by a combination of aqueous contact angle measurements, optical spectroscopy, transmission second-harmonic generation (at λ0 = 1064 nm), and synchrotron X-ray reflectivity. The initial adsorption step from toluene onto the substrate surface at 80°C is completed within minutes, k1 ≈ 1 × 10-2 s-1, and results in an acentric material having ∼65% of the properties of a fully formed, dense monolayer (i.e., thickness, coverage, optical absorption, wettability, and nonlinear optical response). The second assembly stage is about 2 orders of magnitude slower, k2 ≈ 1.3 × 10-4 s-1, and reaches completion after about 6 h.

Original languageEnglish (US)
Pages (from-to)10531-10537
Number of pages7
JournalLangmuir
Volume19
Issue number25
DOIs
StatePublished - Dec 9 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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