Self-Assembled Monolayers Formed using Zero Net Curvature Norbornylogous Bridges: The Influence of Potential on Molecular Orientation

Langmuir ◽  
2010 ◽  
Vol 26 (19) ◽  
pp. 15665-15670 ◽  
Author(s):  
Paul K. Eggers ◽  
Paulo Da Silva ◽  
Nadim A. Darwish ◽  
Yi Zhang ◽  
Yujin Tong ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Self Assembled

A Molecular Architectural Approach to Self-Assembled Monolayers as NLO Materials

1995 ◽  
Vol 413 ◽  
Author(s):  
Xiaoguang Yang ◽  
Laura Smilowitz ◽  
C. Thomas Buscher ◽  
Duncan McBranch ◽  
Jeanne Robinson ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Surface Coverage ◽  
Second Harmonic ◽  
Fused Silica ◽  
Nonlinear Susceptibility ◽  
Self Assembled Monolayers ◽  
Fundamental Wavelength ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Derivatives Of

ABSTRACTSelf-assembled molecular architechtures of nonlinear optical (NLO) chromophores and their super-chromophores are discussed. The chromophores are derivatives of azobenzene sulfonates and the super chromophores are derivatives of calix[4]stilbazole and calix[4]stilbazolium. The studies of azobenzene sulfonates are aimed at understanding the surface coverage and molecular orientation in polar self-assembled monolayers (SAMs). The optimized molecular orientation was found to be 32±3 degree and the maximum surface coverage is approximately 2–4 molecules per nm2 depending on the molecular cross-section. The calixarene chromophores are macrocyclic compounds consisting of four simple D-π-A units bridged by methylene groups. These molecules were synthesized such that four D-π-A units of the calix[4]arene were aligned along the same direction with the calixarene in a cone conformation. Both simple and super-chromophores were subsequently fabricated into covalently bound selfassembled monolayers on the surfaces of fused silica and silicon. Spectroscopic second harmonic generation (SHG) measurements were carried out to determine the absolute value of the dominant element of the second-order nonlinear susceptibility, d33 = 60 pm/V at a fundamental wavelength of 890 nm. Furthermore, SHG imaging was employed to investigate the pattemed SAMs of NLO super chromophores.

PM-IRRAS Determination of Molecular Orientation of Phosphonic Acid Self-Assembled Monolayers on Indium Zinc Oxide

Langmuir ◽  
2015 ◽  
Vol 31 (20) ◽  
pp. 5603-5613 ◽  
Author(s):  
Lingzi Sang ◽  
Anoma Mudalige ◽  
Ajaya K. Sigdel ◽  
Anthony J. Giordano ◽  
Seth R. Marder ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Phosphonic Acid ◽  
Molecular Orientation ◽  
Self Assembled Monolayers ◽  
Indium Zinc Oxide ◽  
Assembled Monolayers ◽  
Self Assembled
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