• Title, Summary, Keyword: conductive polymers

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Biomimetic MIP Terpene Sensors Adding Conductive Polymers (전도성 고분자가 첨가된 생체 모방형 분자 각인 고분자 테르펜 센서)

  • Jung, Jae-Hun;Lee, Sung-Pil
    • Journal of Sensor Science and Technology
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    • v.21 no.5
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    • pp.345-351
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    • 2012
  • Biomimetic terpene sensors which have high sensitivity and stability have been fabricated using moleculary imprinted polymer (MIP) technology. Since it is impossible to make a resistive type sensor due to the high resistance of MIP, we improved the sensor by adding conductive polymers. We investigated the sensitivity of resistive type sensors with nano particles depending on the amount of conductive polymers. The MIP membrane contained the methacrylic acid as functional monomer and ethylene glycol dimethacrylate as cross linker, which formed specific cavities originated by the target terpene molecules. The mixture of MIP and the conductive polymer was coated on the patterns of interdigit electrodes on the alumina substrate. The fabricated sensors showed their highest specific sensitivities exposed to 500 ppm target gases : limonene 0.055 at 40% of amount of conductive polymers and geraniol $5.84{\times}10^{-4}$ at 20% of amount of conductive polymers. In conclusion, we found that the terpene sensors are affected by the target molecules, functional monomers and the conductive polymers.

Characterization of Transparent Electrodes using Carbon Nanotubes Coated by Conductive Polymers (전도성 고분자가 코팅된 탄소 나노튜브 투명전극의 특성 분석)

  • Kim, Bu-Jong;Han, Sang-Hoon;Park, Jin-Seok
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.1
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    • pp.19-25
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    • 2014
  • This study demonstrates transparent electrodes with characteristics desirable for touch screen panels using carbon nanotubes (CNTs). This has been accomplished by depositing CNTs on glass substrates via spray coating and then depositing thin conductive polymer films on the CNTs via spin coating. For all of the samples, such as CNTs, conductive polymers, and polymer-coated CNTs, the surface morphologies, sheet resistances, visible transmittances, chromatic properties are characterized as functions of their preparation conditions, such as the spray times for CNTs and the spin speeds for conductive polymers. The experimental results confirm that only the polymer-coated CNTs can satisfy all of the requirements that are required for electrodes of touch screen panels, such as the sheet resistance lower than $100{\Omega}/sq$, the visible transmittance higher than 80 %, and the yellowness smaller than 1.

Synthesis of Conductive Polymer Nano-wires by Porous Membrane Template (다공막 주형에 의한 전도성 고분자 나노와이어의 합성)

  • Shin, Hwa-Sup;Youm, Kyung-Ho
    • Membrane Journal
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    • v.22 no.1
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    • pp.35-45
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    • 2012
  • We prepared the highly ordered nano-wires of polypyrrole, polyaniline conductive polymers and polypyrrole/ polyaniline conductive copolymers by templating the anodic aluminum oxide (AAO) porous membrane, in which pore diameter was 20 nm, 100 nm and 200 nm. Those conductive polymers were grown from pore inner surface of AAO membrane forming hollow tubes and then wire structures were formed after 3 hour polymerization. By removing AAO membrane templates using sodium hydroxide solution, the conductive polymer nano-wires were successfully obtained, of which diameter and length were close to the ones of nano-pores in AAO membrane template. Crystallinity and thermal stability of the conductive polymer nano-wires were higher than irregular ones that prepared by solution polymerization. Furthermore, the electrical resistance of conductive polymer nano-wires were reduced by about 4~60% compared with that of the irregular polymers prepared by solution polymerization.

Chemical and Electrochemical Synthesis of Highly Conductive and Processable PolyProDOP-alkyl Derivatives

  • Cho, Youn-Kyung;Pyo, Myoung-Ho;Zong, Kyu-Kwan
    • Journal of the Korean Electrochemical Society
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    • v.13 no.1
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    • pp.57-62
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    • 2010
  • New monomers, possessing various alkyl substituents on propylene dioxypyrrole, were synthesized. The monomers could be easily polymerized to produce highly conductive and soluble polymers. The corresponding polymers showed excellent solubility, retaining electrochemical and optical properties of their parent polymer [poly(propylene dioxypyrrole)]. The conductivities of chemically prepared polymers were quite high in a range of 20 and $60\;Scm^{-1}$. Solubility of the polymer in a common organic solvent was as high as no polymer is deposited on an electrode. The redox potentials of the electrochemically prepared polymers revealed quite stable electro-activity during repeated redox switching up to 500 times. The optoelectrochemistry studies also showed distinct color changes of the polymers upon changing the doping state, indicating strong absorption peaks at 400~600 nm in reduced states and complete bleaching in fully oxidized states.

Synthesis and Characterization of Conductive Polyaniline-Modified Polymers via Nitroxide Mediated Radical Polymerization (NMRP 중합법을 이용한 전도성 폴리아닐린-수식 고분자의 제조와 특성)

  • Jaymand, Mehdi
    • Polymer Korea
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    • v.34 no.6
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    • pp.553-559
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    • 2010
  • The paper describes the preparation and characterization of conductive polyaniline-modified polymers by growing of aniline onto functionalized poly(styrene-co-p-methylstyrene) [P(St-co-MSt)]. For this purpose, P(St-co-MSt) was synthesized via nitroxide mediated radical polymerization (NMRP) and then N-boromosuccinimide was used for introduction of bromine to the benzylic positions of copolymer. Afterwards, 1,4-phenylenediamine was linked to the brominated P(St-co-MSt) and functionalized copolymer $[P(St-co-MSt)-NH_2]$ was prepared. The graft copolymerization of aniline monomers onto functionalized P(St-co-MSt) was initiated by oxidized phenylamine groups after addition of ammonium peroxydisulfate (APS), and p-toluenesulfonic acid-doped PANI was chemically grafted onto P(St-co-MSt) via oxidation polymerization. The obtained terpolymer was studied by FTIR and UV-Vis spectroscopy and its thermal behaviour were examined by DSC and TGA analyses. The conductivity of terpolymer was measured by four-point probe method and electroactivity was measured by cyclic voltammetry (CV). The solubility of P(St-co-MSt)-g-PANI was examined in common organic solvents.

Applications of Conductive Polymers to Electrochemical Sensors and Energy Conversion Electrodes

  • Kim, Dong-Min;Noh, Hui-Bog;Shim, Yoon-Bo
    • Journal of Electrochemical Science and Technology
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    • v.4 no.4
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    • pp.125-139
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    • 2013
  • The electrical conductive polymers (ECPs) reported at my research group are introduced in this review, which works are started from the late Professor Su-Moon Park's pioneering research for polyaniline at the University of New Mexico. The electrochemical and spectroelectrochemical properties and their applications to sensor and energy conversion systems are briefly described. At first, the growth and degradation mechanism of polyaniline describes and we extend to polypyrrole, polyazulene, polydiaminonaphthalenes, and polyterthiophene derivatives. In addition, the preparation of monomer precursors having functional groups is briefly described that can give us many exceptional applications for several chemical reactions. We describe the application of these ECPs for the fabrication of chemical sensors, biosensors, biofuel cells, and solar cells.

Conductive Carbon Block Filled Composites( II ) - Concentrated on Processabilily - (전도성 카본블랙이 충진된 도전성 고분자 복합재료(II) -가공성을 중심으로 -)

  • Kim, Jin-Kuk
    • Elastomers and Composites
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    • v.34 no.2
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    • pp.113-120
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    • 1999
  • Nobody doubts to say that one of the most important performance polymers is a conductive polymer. The manufacturing process of the commercial conductive polymers has been known by mixing with the conductive materials, but it doesn't noticeably appear of a conductive function. One of the reasons is the lack of comprehension In compounding a carbon black with polymer rosins. This paper involves the understanding of compounding technology of the conductive carbon black filled composite. Our experimental results indicate that the fibrous shaped carbon black was hard to process but appeared of a superior conductivity compared to a stick or a sphelulite shaped carbon black. Therefore, it was processed with a processing oil in compounding, which led to a better processability and a better conductivity. This study was accomplished that the solution process compared to the melting process.

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DESIGN OF ION CONDUCTIVE POLYMERS BASED ON IONIC LIQUIDS

  • Ohno, Hiroyuki
    • Proceedings of the Polymer Society of Korea Conference
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    • pp.123-124
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    • 2006
  • Ionic liquids (ILs) are collecting keen interests as an advanced substituent of electrolyte solution as well as novel solvents. In the present talk, I will introduce some strategies to fix IL structure on polymer chains to prepare polar polymers with low glass transition temperature. Namely, cationic, anionic, and zwitterionic monomers have been prepared, and they have been homopolymerized or copolymerized to prepare polymer electrolytes with different properties. The polymers themselves showed very poor ionic conductivity, but it was improved by suitable spacer between charged site and main chain. Other unique characteristics of functional ILs and new polymerized ionic liquids will also be mentioned.

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