Structural investigations of Langmuir-Blodgett films of 2-docosylamino-5-nitropyridine, a new type of non-centrosymmetric multilayer for use in non-linear optics

Decher, Gero; Klinkhammer, F.; Peterson, I. R.; Steitz, Roland

doi:10.1016/0040-6090(89)90336-2

Cited by 24 publications

(5 citation statements)

References 7 publications

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“…The spectrum of the LB film transferred from the copper chloride subphase is identical to the one for the film transferred from the pure water. Polarized UV−vis absorption spectra (not reported; they closely resemble those reported in the literature ) show that LB films of DCANP transferred from the pure water present the same anisotropy reported in previous works (the ratio of optical densities parallel and perpendicular to the dipping direction is 1.6 2,10 ). The DCANP LB films transferred from 0.05 M CuCl 2 showed the same polarization-dependent effect as those transferred from pure water, indicating the same orientation of the molecules.…”

Section: Resultssupporting

confidence: 82%

Investigation of 2-(Docosylamino)-5-nitropyridine Monolayers and Langmuir−Blodgett Films

et al. 1996

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The behavior of 2-(docosylamino)-5-nitropyridine (DCANP) spreading monolayers was investigated as a function of temperature, pH, and subphase composition. The interactions of DCANP monolayers with copper ions dissolved into the subphase at different concentrations were also studied. The investigations were carried out by measuring surface pressure and surface potential−area isotherms. Langmuir−Blodgett (LB) films transferred from pure water and copper aqueous subphases were also studied by Fourier transform infrared (FTIR), UV−vis, and electron paramagnetic resonance (EPR) spectroscopies, X-ray photoelectron spectroscopy (XPS), ellipsometry, and refractive index measurements. The interactions between copper ions and DCANP molecules were investigated by means of various techniques in the bulk phase, in monolayers, and in LB films. Clear evidence of interactions between DCANP and copper ions was provided only from EPR spectroscopy in the LB films, because of the very small molar ratio of bound/free DCANP in the LB films. The refractive index of Cu-doped LB films was shown to be increased by the presence of metal ions.

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Section: Resultssupporting

confidence: 82%

Investigation of 2-(Docosylamino)-5-nitropyridine Monolayers and Langmuir−Blodgett Films

et al. 1996

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“…The anisotropy in vertically-deposited films can appear on several different length scales. On the scale of the domain structure (tens of microns), these films can exhibit domain elongation parallel to the dipping direction. ,, On the molecular scale, films of both small and large molecules have been produced in which the molecules are aligned, on average, parallel to the dipping direction. ,,− Chollet and Messier 16 found that deposition-induced alignment of docosanoic acid would only occur if the film was transferred from a phase in which the molecules were tilted from the surface normal. In contrast, studies of fatty acid salts by Zasadzinski and co-workers indicate that the strucure of these transferred films often bears no resemblance to that present at the air−water interface and may instead depend quite strongly on the structure of the substrate.…”

Section: Introductionmentioning

confidence: 99%

Direct Visualization of Flow-Induced Anisotropy in a Fatty Acid Monolayer

et al. 1996

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Brewster angle microscopy is used to directly visualize the influence of an applied extensional flow on the domain structure and molecular orientation of a docosanoic acid monolayer at the air−water interface. At a surface pressure of 12 mN/m and a subphase temperature of 15 °C (L2 phase), extensional flow causes domain elongation parallel to the extension axis. A frequency domain analysis of the Brewster angle images indicates that the domains undergo an affine deformation in response to flow. AT 20 mN/m (L2‘ phase), the flow modifies not only the domain structure of the monolayer but also the azimuthal orientation of the fatty acid molecules. This flow-alignment process is strain-rate dependent. Thus, flow can couple to the monolayer order over a variety of length scales.

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“…12) DCANP was synthesized in the same manner as reported previously. [18][19][20] It was dissolved in chloroform with a concentration of 1 mM, and was spread on the Millipore filtered water (Milli-Q water) surface of a Langmuir film balance (MINI, KSV, Finland) at a temperature of 22 ± 3 • C. The substrate was a fused quartz plate for excitation of 532 nm or a silica plate for 1064 nm, whose surface was treated to be hydrophobic by the evaporation of hexamethyldisilazane. The monolayer was compressed with a velocity of 500 mm 2 min −1 to the surface pressure of 20 mN m −1 ; then the barrier was single combination of polarization.…”

Section: ∞V Ultrathin Filmsmentioning

confidence: 99%

“…susceptibility component along the dipping direction in the surface plane. 12,[18][19][20][21][22][23] The signs of the χ -components are unchanged across the film, i.e., it is a homogeneous polar medium. 12) Moreover, a thick DCANP LB film has been applied to waveguide optics, 22,23) because it possesses high stability and good optical quality.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin-film Local Oscillator for Determination of Complex Components of Second-Order Nonlinear Susceptibility

Kajikawa

Sei

Yoshida

et al. 1999

Jpn. J. Appl. Phys.

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The second-harmonic generation (SHG) interferometry technique has to date been used to determine the phase of secondharmonic (SH) light generated in a single polarization combination of a polarizer and an analyzer. However, it is not easy to compare phases of the SH light generated by a plural polarization combination, because a thick local oscillator, such as an α-quartz single crystal, has several disadvantages for this purpose. The birefringence and optical rotatory power of the quartz crystal often require further consideration on the phase relation of the SH lights with different polarizations. Thus, the full determination of the complex χ -components of an organic ultrathin film by the use of the quartz crystal is impractical. After surveying SH active systems, we found that a 2-docosylamino-5-nitropyridine (DCANP) Langmuir-Blodgett (LB) film is the most applicable for the phase measurements. A few nanometers-thick DCANP LB film, which is much thinner than the wavelength of the SH light, yields a negligible phase delay even if birefringence is present. The SHG efficiency of the film can be easily controlled by changing the number of layers. Some experimental results are addressed to demonstrate the advantage of the DCANP LB film as a local oscillator.

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Structural investigations of Langmuir-Blodgett films of 2-docosylamino-5-nitropyridine, a new type of non-centrosymmetric multilayer for use in non-linear optics

Cited by 24 publications

References 7 publications

Investigation of 2-(Docosylamino)-5-nitropyridine Monolayers and Langmuir−Blodgett Films

Investigation of 2-(Docosylamino)-5-nitropyridine Monolayers and Langmuir−Blodgett Films

Direct Visualization of Flow-Induced Anisotropy in a Fatty Acid Monolayer

Ultrathin-film Local Oscillator for Determination of Complex Components of Second-Order Nonlinear Susceptibility

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