Novel Hybrid Covalent / Ionic Self-Assembly Technique for Improved Second-Order Nonlinear Optical Films

2001 ◽  
Vol 708 ◽  
Author(s):  
P. J. Neyman ◽  
M. Guzy ◽  
S. M. Shah ◽  
R.M. Davis ◽  
K. E. VanCott ◽  
...  
Keyword(s):  
Self Assembly ◽  
Nonlinear Optical ◽  
Second Order ◽  
Bilayer Thickness ◽  
Self Assembled Monolayer ◽  
Nlo Response ◽  
Optical Films ◽  
Polar Orientation ◽  
Assembly Technique ◽  
Oppositely Charged

ABSTRACTIonically self-assembled monolayer (ISAM) films have been shown to spontaneously produce noncentrosymmetric ordering that gives rise to a substantial second order nonlinear optical (NLO) response. Typically, the ISAM films for NLO response are an assemblage of bilayers of oppositely charged polymers whose thickness can be controlled through variation of pH and ionic strength of the immersion solutions. Here, we investigate the effects of replacing the NLO-active polymer layers with layers of monomeric chromophores containing ionic and covalent bonding sites. Films fabricated exclusively using polyelectrolytes contain some fraction of both randomly oriented and anti-parallel oriented chromophores. We have examined the incorporation of monomeric chromophores into ISAM films in order to increase the net polar orientation of the chromophores and reduce bilayer thickness.

Enhanced Second Order Nonlinear Optical Susceptibilities in Ionically Self-Assembled Films Incorporating Dianionic Molecules

2000 ◽  
Vol 660 ◽  
Author(s):  
P.J. Neyman ◽  
M.T. Guzy ◽  
S. Shah ◽  
K.E. Van Cott ◽  
R.M. Davis ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Nonlinear Optical ◽  
Second Order ◽  
Self Assembled Monolayer ◽  
Polymer Layers ◽  
Charged Polymers ◽  
Nlo Response ◽  
Polar Orientation ◽  
Self Assembled ◽  
Oppositely Charged

ABSTRACTIonically self-assembled monolayer (ISAM) films have been recently shown to spontaneously produce noncentrosymmetric ordering that gives rise to a substantial second order nonlinear optical (NLO) response. Typically, the ISAM films for NLO response are an assemblage of bilayers of oppositely charged polymers whose thickness can be controlled through variation of pH and ionic strength of the immersion solutions. Here, we study the effects of replacing the NLO-active polymer layers with layers of dianionic molecules. Films fabricated exclusively using polyelectrolytes contain some fraction of both randomly oriented and anti-parallel oriented chromophores. The incorporation of dianionic molecules within the ISAM films affords greater χ(2) due to increased net polar orientation of the chromophores.

Hybrid Covalent/Ionic Self-Assembly of Organic Second Order Nonlinear Optical Films

2002 ◽  
Author(s):  
J.R. Heflin ◽  
P.J. Neyman ◽  
C. Brands ◽  
M.T. Guzy ◽  
S.M. Shah ◽  
...  
Keyword(s):  
Self Assembly ◽  
Nonlinear Optical ◽  
Second Order ◽  
Optical Films

Hybrid covalent/ionic self-assembly of second order nonlinear optical films

2004 ◽  
Author(s):  
James R. Heflin ◽  
Patrick Neyman ◽  
Charles Brands ◽  
Matt Guzy ◽  
Kylie Gaskins ◽  
...  
Keyword(s):  
Self Assembly ◽  
Nonlinear Optical ◽  
Second Order ◽  
Optical Films

Hybrid covalent/ionic self-assembly of second order nonlinear optical films

2003 ◽  
Author(s):  
P.J. Neyman ◽  
C. Brands ◽  
J.R. Heflin ◽  
M.T. Guzy ◽  
K. Gaskins ◽  
...  
Keyword(s):  
Self Assembly ◽  
Nonlinear Optical ◽  
Second Order ◽  
Optical Films

Hybrid Covalent/Ionic Self-Assembly of Organic Second Order Nonlinear Optical Films

2002 ◽  
Author(s):  
J.R. Heflin ◽  
P.J. Neyman ◽  
C. Brands ◽  
M.T. Guzy ◽  
S.M. Shah ◽  
...  
Keyword(s):  
Self Assembly ◽  
Nonlinear Optical ◽  
Second Order ◽  
Optical Films

DFT STUDY ON SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF THE DERIVATIVES OF DISUBSTITUTED SEVEN-VERTEX COBALTACARBORANE METALLOCENYL

2010 ◽  
Vol 09 (01) ◽  
pp. 219-231 ◽  
Author(s):  
XIAODONG LIU ◽  
YONGQING QIU ◽  
SHILING SUN ◽  
CHUNGUANG LIU ◽  
ZHONGMIN SU
Keyword(s):  
Nonlinear Optical ◽  
Membered Ring ◽  
Second Order ◽  
Meta Position ◽  
Nlo Response ◽  
B3lyp Method ◽  
Acceptor Group ◽  
Calculation Results ◽  
Optimum Model ◽  
Derivatives Of

DFT B3LYP method was employed to calculate the second-order nonlinear optical (NLO) responses of the derivatives of disubstituted seven-vertex cobaltacarborane metallocenyl. The results show that cobaltacarborane metallocenyl plays a pushing/pulling role and a bridge role to transfer electron in these molecules. The five-membered ring of cyclopentadiene is more beneficial to increase second-order NLO response than the five-membered ring composed of two C atoms and three B atoms in cobaltacarborane. Moreover, the second-order NLO response is more powerful when one substituent containing electron donor group and one substituent containing electron acceptor group are located at meta position. Accordingly, among the nine models, model c2 is the optimum model with largest value of βtot. The calculation results also show that cobaltacarborane metallocenyl and ferrocene parts play the same roles to increase second-order NLO response. Thus, cobaltacarborane metallocenyl can be a promising second-order NLO material.

scholarly journals Electrochemistry Study of Permselectivity and Interfacial Electron Transfers of a Branch-Tailed Fluorosurfactant Self-Assembled Monolayer on Gold

Molecules ◽  
2018 ◽  
Vol 23 (11) ◽  
pp. 2998 ◽  
Author(s):  
Shanshan Li ◽  
Qingying Luo ◽  
Zhiqing Zhang ◽  
Guanghui Shen ◽  
Hejun Wu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrochemical Impedance ◽  
Click Reaction ◽  
Hydration Shell ◽  
Self Assembled Monolayer ◽  
Tunneling Mechanism ◽  
Assembly Technique ◽  
Hydration Resistance ◽  
Self Assembled ◽  
Electron Transfers

We investigated the permselectivity and interfacial electron transfers of an amphiphilic branch-tailed fluorosurfactant self-assembled monolayer (FS-SAM) on a gold electrode by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The FS-SAM was prepared by a self-assembly technique and a “click” reaction. The barrier property and interfacial electron transfers of the FS-SAM were also evaluated using various probes with different features. The FS-SAM allowed a higher degree of permeation by small hydrophilic (Cl− and F−) electrolyte ions than large hydrophobic (ClO4− and PF6−) ones. Meanwhile, the redox reaction of the Fe(CN)63− couple was nearly completely blocked by the FS-SAM, whereas the electron transfer of Ru(NH3)63+ was easier than that of Fe(CN)63−, which may be due to the underlying tunneling mechanism. For hydrophobic dopamine, the hydrophobic bonding between the FS-SAM exterior fluoroalkyl moieties and the hydrophobic probes, as well as the hydration resistance from the interior hydration shell around the oligo (ethylene glycol) moieties, hindered the transport of hydrophobic probes into the FS-SAM. These results may have profound implications for understanding the permselectivity and electron transfers of amphiphilic surfaces consisting of molecules containing aromatic groups and branch-tailed fluorosurfactants in their structures.

Second-order nonlinear optical films for alternating polyelectrolyte deposition

1998 ◽  
Author(s):  
Geoffrey A. Lindsay ◽  
M. Joseph Roberts ◽  
John D. Stenger-Smith ◽  
Peter Zarras ◽  
Richard A. Hollins ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Order ◽  
Optical Films

Formation of Antibody Microarrays on Aluminum Nitride Surface Using Patterned Organosilane Self-Assembled Monolayers

2009 ◽  
Vol 1202 ◽  
Author(s):  
Chi-Shun Chiu ◽  
Hong-Mao Lee ◽  
Shangjr Gwo
Keyword(s):  
Aluminum Nitride ◽  
Aluminum Gallium Nitride ◽  
Self Assembly ◽  
Fluorescent Protein ◽  
Specific Protein ◽  
Self Assembled Monolayer ◽  
Antibody Microarrays ◽  
Assembly Technique ◽  
Self Assembled ◽  
Lift Off

AbstractSurface biofunctionalization of group-III nitride semiconductors has recently attracted much interest due to their biocompatibility, nontoxicity, and long-term chemical stability under demanding physiochemical conditions for chemical and biological sensing. Among III-nitrides, aluminum nitride (AlN) and aluminum gallium nitride (AlGaN) are particularly important because they are often used as the sensing surfaces for sensors based on field-effect transistor or surface acoustic wave sensor structures. Patterned self-assembled monolayer (SAM) templates are composed of two types of organosilane molecules terminated with different functional groups (amino and methyl), which were fabricated on AlN/sapphire substrates by combining photolithography, lift-off process, and self-assembly technique. Clear imaging contrast of SAM micropatterns can be observed by field emission scanning electron microscopy (FE-SEM) operating at a low accelerating voltage in the range of 0.5–1.5 kV. In this work, the formation of green fluorescent protein (GFP) antibody microarrays was demonstrated by the specific protein binding of enhanced GFP (EGFP) labeling. The observed strong fluorescent signal from antibody functionalized regions on the SAM-patterned AlN surface indicates the retained biological activity of specific molecular recognition resulting from the antibody–EGFP interaction. The results reported here show that micropatterning of organosilane SAMs by the combination of photolithographic process and lift-off technique is a practical approach for the fabrication of reaction regions on AlN-based bioanalytical microdevices.

Electric-Field-Induced Layer-by-Layer Fabrication of Second-Order Nonlinear Optical Films with High Thermal Stability

Langmuir ◽  
2004 ◽  
Vol 20 (21) ◽  
pp. 8952-8954 ◽  
Author(s):  
Yao Wang ◽  
Wang ◽  
Ying Guo ◽  
Cui ◽  
Quan Lin ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electric Field ◽  
Nonlinear Optical ◽  
Second Order ◽  
High Thermal Stability ◽  
Layer By Layer ◽  
Optical Films
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