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 language | English |
|---|---|
| Pages (from-to) | 10531-10537 |
| Number of pages | 7 |
| Journal | Langmuir |
| Volume | 19 |
| Issue number | 25 |
| DOIs | |
| Publication status | Published - Dec 9 2003 |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Colloid and Surface Chemistry
Cite this
Interrupted-growth studies of the self-assembly of intrinsically acentric siloxane-derived monolayers. / van der Boom, Milko; Evmenenko, Guennadi; Yu, Chungjong; Dutta, Pulak; Marks, Tobin J.
In: Langmuir, Vol. 19, No. 25, 09.12.2003, p. 10531-10537.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interrupted-growth studies of the self-assembly of intrinsically acentric siloxane-derived monolayers
AU - van der Boom, Milko
AU - Evmenenko, Guennadi
AU - Yu, Chungjong
AU - Dutta, Pulak
AU - Marks, Tobin J
PY - 2003/12/9
Y1 - 2003/12/9
N2 - 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.
AB - 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.
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U2 - 10.1021/la034900f
DO - 10.1021/la034900f
M3 - Article
AN - SCOPUS:0346342681
VL - 19
SP - 10531
EP - 10537
JO - Langmuir
JF - Langmuir
SN - 0743-7463
IS - 25
ER -