Mono- and multi-layer langmuir-blodgett films of maleimide polymers possessing nonlinear optical-active side chains

Yoon, Kuk Ro; Lee, Hoo Sung; Rhee, Bum Ku; Jung, Chang Soo

doi:10.1007/bf03218447

Cited by 9 publications

(3 citation statements)

References 29 publications

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“…11 The Langmuir-Blodgett (LB) technique is one of the most popular methods for fabricating molecularly well-oriented and assembled thin films utilizing air-water interfaces. [12][13][14][15] It also enables precise control of the monolayer thickness, homogeneous deposition of the monolayer over large areas, and the fabrication of multilayers with varying layer organization. The typical procedure for obtaining the LB film is as follows.…”

Section: Introductionmentioning

confidence: 99%

Tetrapyrazinoindoloporphyrazine Langmuir-Blodgett films

2008

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We fabricated tetra(5-n-nonyl-8-tert-butyl-2,3-pyrazino[2,3-b]indolo)porphyrazinato copper(II) (Cu-Pc-C 8 ) Langmuir-Blodgett (LB) films. We further investigated the influence of arachidic acid (AA) as a transfer promoter, as well as the effect of dipping speed, on the deposition of the films on hydrophilic and hydrophobic substrates. In the case of pure Cu-Pc-C 8 LB deposition on a hydrophilic substrate, the transfer ratio was close to one for up-stroke depositions, but the previously deposited film was peeled off and re-spread onto water at down-stroke depositions. Whereas the stability of the Cu-Pc-C 8 LB films was not improved by AA addition on hydrophilic substrates, the deposition of Cu-Pc-C 8 was significantly improved by the presence of AA on a hydrophobic substrate. The AAassisted deposition had transfer ratio of close to 1 and was essentially stable up to 10-layer depositions. Comparison of the UV-visible spectrum of a Cu-Pc-C 8 /AA LB film with that of Cu-Pc-C 8 /AA solution in dichloroethane revealed that the Soret and Q bands for the Cu-Pc-C 8 /AA LB film were broadened and red-shifted due to the aggregation of phthalocyanines upon assembly in the LB film.

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Section: Introductionmentioning

confidence: 99%

Tetrapyrazinoindoloporphyrazine Langmuir-Blodgett films

2008

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“…Nonlinear optical (NLO) polymers based on heterocyclic compounds have attracted great interest in recent years [14][15][16][17][18][19][20]; these compounds are important for the development of high-speed optical modulators and switches. Great effort have been made in the synthesis and characterization of NLO polymers based on heterocyclic compounds, for instance, Yoon et al reported the synthesis and characterization of novel carbazole-based push -pull type nonlinear optical polymers including P(Cz-CN), P(Cz-DR 19), and P(Cz-TCN).…”

Section: Introductionmentioning

confidence: 99%

Molecular electric properties of nitrogen heterocycles

Safinejad

Asghari-Khiavi

2009

JCM

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Solvent effects on molecular electric properties of several nitrogen heterocycles have been studied using quantum chemical calculations. Two reaction field models including Onsager model and polarizable continuum model have been employed to investigate the reaction field effects. It is observed that dipole moment, polarizability, and total hyperpolarizability of the studied compounds increase with reaction field. Furthermore, ab initio method and perturbation treatment of the Onsager model have been used to evaluate molecular and structural properties of N -bromophthalimide. A very good agreement is observed between the results of the ab initio method and those of the perturbation treatment.

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“…[1][2][3][4][5][6] Among them, NLO polymers are considered as candidate materials, mainly because they have many advantages such as mechanical endurance, low mass, and good processability. In the developments of NLO polymers for electro-optic device applications, stabilization of electrically-induced dipole alignment is an important criteria; in this context, one approach to minimize the randomization of dipole alignment is to use of high glass-transition temperature (T g ) polymers such as polyimides.…”

Section: Introductionmentioning

confidence: 99%