Thermally Stable Nonlinear Optical Moiety-Doped Polyimides for Photonic Devices

Kim, H. K.; Lee, Hyun-Jin; Lee, M. H.; Han, Sang-Pil; Kim, H. Y.; Kang, Kwang‐Yong; Min, Yoo Hong; Won, Yong Hyub

doi:10.1021/bk-1995-0601.ch008

Cited by 5 publications

(5 citation statements)

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“…Surface functionalisation of GNP using citrate ions can be performed in a controlled manner. On the other hand, the GNP was functionalised with PEI showed a characteristic carbonyl absorption of imide and ester at around 3000 and 3400 cm À1 (Figure 2), respectively, which was reported earlier by Kim et al [12]. Poly(ethyleneimine) is a branched chain polymer having a ratio of 1:2:1 of primary:secondary:tertiary amines with a branching site for every 3-3.5 nitrogen atoms and a general backbone of (CH 2 CH 2 NH) x .…”

Section: Characterisationssupporting

confidence: 82%

Functionalised gold nanoparticles for selective induction ofin vitroapoptosis among human cancer cell lines

Mohan

Praveen

Chennazhi

et al. 2013

Journal of Experimental Nanoscience

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The interaction of citrate-and polyethylene imine (PEI)-functionalised gold nanoparticles (GNP) with cancer cell lines with respect to the cellular response was studied. It was found that GNP/citrate nanoparticles were able to induce apoptosis in human carcinoma lung cell lines A549, but GNP/PEI did not show any reduction in the viability of the cells in human breast cancer cell line MCF-7 and A549 cell lines. FACS data confirmed that the number of apoptotic cells increased with increase in the concentration of GNP/citrate nanoparticles. Decline in cellular expansion and changes in the nuclear morphology were noted after the treatment of GNP/citrate nanoparticles on A549 cell lines, which itself is a direct response for stress induction. The induction of cellular apoptosis was further confirmed by DNA fragmentation assay. These data confirm the potential of GNP/citrate nanoparticle to evoke cell-specific death response in the A549 cell lines.

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Section: Characterisationssupporting

confidence: 82%

Functionalised gold nanoparticles for selective induction ofin vitroapoptosis among human cancer cell lines

Mohan

Praveen

Chennazhi

et al. 2013

Journal of Experimental Nanoscience

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“…A number of side-chain NLO polymers have been prepared by various polymerization methods. ,,− Recently, in our laboratory, a metathesis polymerization technique to synthesize second-order NLO polymers was investigated by the metathesis polymerization of the 1,6-heptadiyne derivatives bearing NLO chromophores. It yielded a type of multifunctional polymers that contain a conjugated backbone and a pedant NLO chromophore for both third- and second-order nonlinear optical materials, respectively.…”

Section: B Side Chain Nlo Poly(16-heptadiyne) Derivativesmentioning

confidence: 99%

Poly(1,6-heptadiyne)-Based Materials by Metathesis Polymerization

et al. 2000

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A new class of multifunctional polymers based on poly(l,6heptadiyne) derivatives with various functional groups such as carbazole unit for photoconductive polymers and nonlinear optical (NLO) chromophores for NLO polymers were synthesized by metathesis polymerization. The polymerizations were carried out with MoCI,-and WCI,-based catalysts. The catalytic activity of MoCI, was found to be greater than that of WCI , . The resulting polymers exhibited photoconductivity and large optical nonlinearity. These conjugated polymers have good solubility in common organic solvents, long-term stability toward air oxidation, and high electrical conductivity.

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“…Recently, high glass transition temperature polymers such as aromatic polyimide , and aromatic polyesters were developed as polymeric backbones for the purpose of restraining the relaxation of the noncentrosymmetric chromophore-alignment induced by an electric field. Among them, NLO functionalized aromatic polyimides have shown promising potential in device applications due to the higher temperature alignment stability and better mechanical properties and processability than other NLO polymeric systems, such as a side chain system and a guest−host NLO chromophore-polyimide system.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Organic/Inorganic Hybrid Nonlinear Optic Materials via Sol−Gel Process: Synthesis, Optical Properties, and Photobleaching for Channel Waveguides

Kim

Kang²,

Choi³

et al. 1999

Chem. Mater.

103

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The thermally stable second-order nonlinear optic (NLO) hybrid materials were successfully prepared by a sol-gel process using dye-attached sol-gel monomers (ormosils) of difunctionalized or trifunctionalized second-order NLO chromophores attached to silicon atoms. The dye-attached sol-gel monomers were synthesized by the coupling reaction of 3-isocyanatopropyltriethoxysilane with the corresponding functionalized NLO chromophores in DMAc. The dye-attached sol-gel monomers were homopolymerized and copolymerized with TEOS by hydrolysis and polycondensation in the presence of a slight excess amount of acidified water (pH 3), yielding the hybrid precusors (or a homogeneous solution). The hybrid precursors were spin-coated on various substrates such as ITO glass and NaCl disk. Hybrid films were further polycondensed by curing at 170°C for 3 h. The cured hybrid materials existed in monohydroxy (T 2 , Q 3 ) and nonhydroxy (T 3 , Q 4 ) states, indicating the formation of a highly cross-linked silicon-oxygen polymeric network. All of the cured organic/SiO 2 hybrid films are transparent. The organic/SiO 2 hybrid materials were quite stable at elevated temperatures above 250°C. The hybrid films were poled by corona discharge technique or dc contact electrode. The values of electro-optic coefficient for the organic/SiO 2 hybrid materials were in the range of 3.7 to 16 pm/V at the wavelength of 1.3 µm, depending on dye-attached sol-gel monomers and poling conditions. The SG-DANS (1:2:2) film shows excellent temporal stability. The r 33 signal remained at 80% of its initial value after heating even at 150°C for 3 h. Also, the second-order nonlinear optical coefficient d 31 of 72 pm/V for the SG-DANS (1:2:0) hybrid film measured by the Maker fringe technique was obtained. The refractive index was decreased after photobleaching. Using the hybrid film, a singlemode channel waveguide was also fabricated by the photobleaching method. The mode pattern confirmed that a channel waveguide was single-mode, and the optical propagation loss was measured to be less than 1 dB/cm.

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Thermally Stable Nonlinear Optical Moiety-Doped Polyimides for Photonic Devices

Cited by 5 publications

References 0 publications

Functionalised gold nanoparticles for selective induction ofin vitroapoptosis among human cancer cell lines

Functionalised gold nanoparticles for selective induction ofin vitroapoptosis among human cancer cell lines

Poly(1,6-heptadiyne)-Based Materials by Metathesis Polymerization

Highly Efficient Organic/Inorganic Hybrid Nonlinear Optic Materials via Sol−Gel Process: Synthesis, Optical Properties, and Photobleaching for Channel Waveguides

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