Studies of Orientational Order in Monolayers of Nonlinear Optical Dye Molecules

1987 ◽  
Vol 109 ◽  
Author(s):  
J. D. Legrange ◽  
L. A. King ◽  
M. G. Kuzyk ◽  
K. D. Singer ◽  
H. E. Katz ◽  
...  
Keyword(s):  
Azo Dye ◽  
Second Harmonic ◽  
Orientational Order ◽  
Linear Absorption ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Air Water Interface ◽  
Material Forming ◽  
New Compounds ◽  
Absorption Measurements

ABSTRACTWe present results of studies of orientational order of Langmuir-Blodgett monolayer and multilayer films based on second harmonic generation and linear absorption measurements. Two new compounds, a tricyanovinyl aniline and a tricyanovinyl azo dye, both possessing large second order molecular susceptibilities have been synthesized and transferred as monolayers from the air-water interface to solid substrates using the Langmuir-Blodgett technique. The azo dye is a superior Langmuir-Blodgett material, forming films which are chemically and structurally stable. Multilayers of this compound show an enhancement in polar orientational order with thickness, as observed in the dependence of the second harmonic polarization components on number of layers.

Structural and Morphological Characterization of Ultrathin Films of an Asymmetric Polydiacetylene

1996 ◽  
Vol 440 ◽  
Author(s):  
H. C. Wang ◽  
D. W. Cheong ◽  
J. Kumar ◽  
C. Sung ◽  
S. K. Tripathy
Keyword(s):  
Second Harmonic ◽  
Morphological Characterization ◽  
Lb Films ◽  
Force Microscopy ◽  
Langmuir Blodgett ◽  
Glass Substrates ◽  
Atomic Force ◽  
Transmission Electron ◽  
Air Water Interface

AbstractA soluble, asymmetrically substituted polydiacetylene, poly(BPOD), has been reported to form stable monolayers at the air-water interface by the Langmuir-Blodgett (LB) technique [2]. Preformed polydiacetylene has been deposited onto hydrophobic substrates as multilayers to form second order nonlinear optical thin films. Second harmonic generation was found to increase with the number of layers. From previous atomic force microscopy (AFM) studies backbone orientation along the dipping direction with an interchain spacing of about 5 A° was indicated [2].The film morphology and preferential molecular orientation of these LB films are further investigated by transmission electron microscopy (TEM). A specifically tailored sample preparation method for the ultrathin LB films was used. Multilayer films were deposited on hydrophobic collodion covered glass substrates for this purpose. Electron diffraction was employed to study the crystalline organization of mono and multilayers of LB films as well as cast films.

Second Harmonic Generation by Langmuir-Blodgett Multilayers of an Organic Azo Dye

1987 ◽  
Vol 3 (7) ◽  
pp. 803-809 ◽  
Author(s):  
I Ledoux ◽  
D Josse ◽  
P Vidakovic ◽  
J Zyss ◽  
R. A Hann ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Azo Dye ◽  
Second Harmonic ◽  
Langmuir Blodgett

SECOND ORDER NONLINEAR OPTICAL PROPERTIES OF LANGMUIR–BLODGETT FILMS CONSISTING OF NON-AMPHIPHILIC POLAR MOLECULES

2004 ◽  
Vol 13 (03n04) ◽  
pp. 355-358 ◽  
Author(s):  
JUN KAWAMATA ◽  
SHOICHIRO HIRAKAWA ◽  
SEIJI TANI ◽  
YUICHIRO OGATA ◽  
AKIHIKO YAMAGISHI
Keyword(s):  
Optical Properties ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Single Layer ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Langmuir Blodgett Films

We have prepared hybrid Langmuir–Blodgett (LB) films consisting of a clay single layer and a non-amphiphilic polar molecule, 2,5-bis(p-dimethylaminocinnamylidene)-cyclopentanone. LB films deposited on solid substrates were characterized by means of UV-vis absorption spectroscopy and optical second-harmonic generation (SHG) measurements.

ENHANCED SHG IN POLYELECTROLYTE COMPLEXED HEMICYANINE DYE LANGMUIR–BLODGETT FILMS

2004 ◽  
Vol 13 (03n04) ◽  
pp. 347-353 ◽  
Author(s):  
M. SHARATH CHANDRA ◽  
Y. OGATA ◽  
J. KAWAMATA ◽  
T. P. RADHAKRISHNAN
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Convenient Method ◽  
Second Harmonic ◽  
Water Interface ◽  
Langmuir Film ◽  
Langmuir Blodgett ◽  
Air Water Interface ◽  
Hemicyanine Dye ◽  
Langmuir Blodgett Films

Complexation of ionic amphiphiles at the air–water interface by polyelectrolytes in the subphase has a pronounced effect of stabilization and deaggregation on the amphiphiles. We have effectively utilized the latter in the case of a hemicyanine dye based amphiphile. The aggregation of these amphiphiles is influenced by the rate of equilibration of the Langmuir film and the introduction of polyelectrolytes in the subphase is found to be a convenient method to suppress the aggregation. Langmuir–Blodgett films obtained by transfer of the polyelectrolyte complexed amphiphiles show enhanced second harmonic generation.

Nanosheet Films of Schiff Bases Polymer for Micropatterning

2014 ◽  
Vol 488-489 ◽  
pp. 260-264
Author(s):  
Qiu Ling Wang ◽  
Yong Na Li ◽  
Hui Ying Jia ◽  
Yong Ze Wei ◽  
Hui Fan Du ◽  
...  
Keyword(s):  
Free Radical ◽  
Film Formation ◽  
Wet Etching ◽  
Side Chain ◽  
Water Interface ◽  
Lb Films ◽  
Langmuir Blodgett ◽  
Solid Substrates ◽  
Air Water Interface ◽  
Deep Uv

A series of novel copolymers [p (AOBHA-co-NPMA)] containing 2-Allyloxy-N-benzylidene hexadecylamine (AOBHA) as film formation material and β-naphtayl methacrylate (NPMA) as photosensitive group were synthesized by free-radical polymerization. The copolymers could form stable condensed monolayer at air/water interface and be transformed onto solid substrates. Positive-tone patterns with the resolution of 0.75 μm of the copolymers Langmuir-Blodgett (LB) films with 35 layers were fabricated by deep UV irradiation, followed by developing with acetone. The etched gold patterns with resolution of 0.75 μm were also obtained, showing that the copolymer has enough resistance to wet etching suitable for fabricating photomask. The mechanism of photolysis was also investigated by UV and GPC, in which showed that the scission of main and side chain of p (AOBHA-co-NPMA) LB films occurred at the same time.

Self-assembly of PBzMA-b-PDMAEMA diblock copolymer films at the air–water interface and deposition on solid substrates via Langmuir–Blodgett transfer

Soft Matter ◽  
2013 ◽  
Vol 9 (45) ◽  
pp. 10899 ◽  
Author(s):  
P. Cecilia dos Santos Claro ◽  
Marcos E. Coustet ◽  
Carolina Diaz ◽  
Eliana Maza ◽  
M. Susana Cortizo ◽  
...  
Keyword(s):  
Diblock Copolymer ◽  
Self Assembly ◽  
Water Interface ◽  
Langmuir Blodgett ◽  
Copolymer Films ◽  
Solid Substrates ◽  
Air Water Interface

Synthesis and monolayer spreading behaviour of surface-active compounds containing electron- and hole-transporting groups. 1. Fluorenylidene derivatives

1989 ◽  
Vol 67 (12) ◽  
pp. 2136-2141 ◽  
Author(s):  
J. W. Taylor ◽  
C. P. Sloan ◽  
D. A. Holden ◽  
G. J. Kovacs ◽  
R. O. Loutfy
Keyword(s):  
Hydrocarbon Chain ◽  
Cross Sectional ◽  
Langmuir Blodgett ◽  
Air Water Interface ◽  
Hole Transporting ◽  
Langmuir Blodgett Films ◽  
Surface Active ◽  
New Compounds ◽  
Surface Active Compounds ◽  
Polyester Film

Surface-active derivatives containing fluorenylidene groups were synthesized, with the goal of creating thin-film devices incorporating monolayers of electron-transporting materials. The new compounds were studied in monolayers at the air–water interface, and were further characterized by cyclic voltammetry. The spreading behaviour of long-chain esters of a fluorenylidene malononitrile carboxylic acid was relatively insensitive to the cross-sectional area of the hydrocarbon chain, but was more strongly affected by changes in the polarity of the hydrophilic groups. Conditions for Langmuir–Blodgett deposition of multilayers of two of the new compounds on titanium-coated polyester film were also explored. Keywords: monolayers, Langmuir–Blodgett films, fluorene, surfactants.

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