Investigation of sub-monolayer, monolayer, and multilayer self-assembled semifluorinated alkylsilane films

Kristalyn, Cornelius B., Watt, Shannon, Spanninga, Sarah A., Barnard, Rachel A., Nguyen, Khoi and Chen, Zhan (2011) Investigation of sub-monolayer, monolayer, and multilayer self-assembled semifluorinated alkylsilane films. Journal of Colloid and Interface Science, 353 1: 322-330. doi:10.1016/j.jcis.2010.09.057

Author Kristalyn, Cornelius B.
Watt, Shannon
Spanninga, Sarah A.
Barnard, Rachel A.
Nguyen, Khoi
Chen, Zhan
Title Investigation of sub-monolayer, monolayer, and multilayer self-assembled semifluorinated alkylsilane films
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
Publication date 2011-01-01
Sub-type Article (original research)
DOI 10.1016/j.jcis.2010.09.057
Volume 353
Issue 1
Start page 322
End page 330
Total pages 9
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Language eng
Abstract Semifluorinated self-assembled (FAS SA) films fabricated from trifunctional precursors are frequently used in myriad applications, yet an understanding of the effects of fabrication conditions, including deposition time, on adsorption mechanisms and molecular architectures is still being developed. In this work we prepared SA films based on the F(CF2)8(CH2)2SiCl3 (FAS-17) precursor and characterized these films using a suite of surface analytical techniques. Contact angle, sum frequency generation (SFG) spectroscopy, X-ray photoelectron spectroscopy (XPS), and ellipsometry results are consistent with the formation of disordered sub-monolayer structures at short deposition times, well-ordered monolayers at intermediate deposition times, and inhomogeneous multilayers at long deposition times. Correlation of SFG and XPS results demonstrates a change in FAS-17 chain orientation as the deposition time increases from 2 s to 5min. Group theory-based calculations, SFG studies, and Fourier-transform infrared (FTIR) results also afford additional evidence in support of the assignment of the SFG signals at ∼1345 and ∼1370cm-1 to the asymmetric stretching mode of the semifluorinated silane chain's terminal CF3 group rather than to its axial CF2 stretches. To our knowledge, this is the first report of SFG studies on semifluoroalkyl silane self-assembled films in the C-F stretching frequency region.
Keyword Ellipsometry
Self-assembled monolayer
Semifluoroalkyl silane
Sum frequency generation vibrational spectroscopy
X-ray photoelectron spectroscopy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Chemical Engineering Publications
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