• Title, Summary, Keyword: Conducting Polymer

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Fabrication of Conducting Polymer Nanomaterials Using Soft Template Method

  • Jang, Jyong-Sik
    • Proceedings of the Polymer Society of Korea Conference
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    • pp.76-77
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    • 2006
  • Conducting polymers have been attracting considerable attention from both scientific and industrial perspectives by virtue of the beneficial electrical and optical properties originating from their unique ${\pi}-conjugated$ system. Many efforts have been devoted toward fabricating conducting polymer nanomaterials. Of the various synthetic methodologies, soft template method has emerged as a very promising tool in fabricating conducting polymer nanomaterials. For last a few years, our research group has intensively studied the fabrication and application of conducting polymer nanomaterials. In this talk, the recent achievement in the synthetic methodology based on the use of soft templates will be discussed.

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Preparation and Characteristics of Conducting Polymer-Coated MWCNTs as Electromagnetic Interference Shielding Materials

  • Kim, Yeon-Yi;Yun, Ju-Mi;Lee, Young-Seak;Kim, Hyung-Il
    • Carbon letters
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    • v.12 no.1
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    • pp.48-52
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    • 2011
  • The conducting polymer-coated multi-walled carbon nanotubes (MWCNTs) were prepared by template polymerization of aniline and pyrrole on the surface of MWCNTs in order to develop the novel electromagnetic interference (EMI) shielding materials. The conducting polymer phases formed on the surface of MWCNTs were confirmed by field emission-scanning electron microscopy and field emission-transmission electron microscopy. Both permittivity and permeability were significantly improved for the conducting polymer-coated MWCNTs due to the intrinsic electrical properties of MWCNTs and the conducting properties of coated polymers. The electromagnetic waves were effectively absorbed based on the permittivity nature of conducting polymer and MWCNTs preventing the secondary interference from reflecting the electromagnetic waves. The highly improved EMI shielding efficiency was also obtained for the conducting polymer-coated MWCNTs showing the synergistic effects by combining MWCNTs and the conducting polymers.

Fabrication of Conducting Polymer Thin Films Using Molecular Layer Deposition

  • Han, Gyu-Seok;Seong, Myeong-Mo
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.289-289
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    • 2011
  • The conducting polymer thin films were deposited using the gas phase method which known as molecular layer deposition (MLD). Terephthalaldehyde (TPA) and p-phenylenediamine (PD) were used as monomers to deposit conducting polymer. Self-terminating nature of TPA and PD reaction were demonstrated by growth rate saturation versus precursors dosing time. Infrared spectroscopic and X-ray photoelectron spectroscopy were employed to determine the chemical composition and state of conducting polymer thin films. Layer by layer growth and polymerization of thin films can be showed by shifting of absorption edge using UV-VIS spectroscopy. This conducting polymer fabricated by using MLD method gives the opportunity to develop new hybrid materials by combining inorganic materials in nanoscale.

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Preparation and characteristics of conducting polymer-coated multiwalled carbon nanotubes for a gas sensor

  • Jang, Woo-Kyung;Yun, Ju-Mi;Kim, Hyung-Il;Lee, Young-Seak
    • Carbon letters
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    • v.12 no.3
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    • pp.162-166
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    • 2011
  • Conducting polymer-coated multiwalled carbon nanotubes (MWCNTs) were prepared by template polymerization in order to enhance their gas sensitivity. This investigation of the conducting polymer phases that formed on the surface of the MWCNTs is based on field-emission scanning electron microscopy images. The thermal stability of the conducting polymer-coated MWCNTs was significantly improved by the high thermal stability of MWCNTs. The synergistic effects of the conducting polymer-coated MWCNTs improve the gas-sensing properties. MWCNTs coated with polyaniline uniformly show outstanding improvement in gas sensitivity to $NH_3$ due to the synergistic combination of efficient adsorption of $NH_3$ gas and variation in the conduction of electrons.

Current Research on Conducting Polymer-Carbon Nanocomposites for Bioengineering Applications

  • Lee, Seunghyeon;Lee, Sang Kyu;Jang, Daseul;Shim, Bong Sup
    • Elastomers and Composites
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    • v.52 no.1
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    • pp.69-80
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    • 2017
  • Conducting polymers and carbon nanomaterials offer a wide range of applications because of their unique soft conducting properties. Specifically, these conducting polymer-carbon nanocomposites have recently been utilized in bioengineering applications, partly because of their improved biocompatibility compared to conventional conducting materials such as metals and ceramics. Based on the assumption that these composites offer an important application potential as functional materials for biomedical devices or even as biomaterials, this review surveys the recent research trends on conducting polymers-carbon nanocomposites, focusing on bioengineering applications such as polyaniline (PANI), poly(3,4-ethylenedioxythiophene) or PEDOT, polypyrrole (Ppy), and carbon nanotubes and graphene.

Synthesis of Mesostructured Conducting Polymer-Carbon Nanocomposites and Their Electrochemical Performance

  • Choi, Moon-Jung;Lim, Byung-Kwon;Jang, Jyong-Sik
    • Macromolecular Research
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    • v.16 no.3
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    • pp.200-203
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    • 2008
  • A conducting polymer layer was introduced into the pore surface of mesoporous carbon via vapor infiltration of a monomer and subsequent chemical oxidative polymerization. The polypyrrole, conducting polymer has attracted considerable attention due to the high electrical conductivity and stability under ambient conditions. The mesoporous carbon-polypyrrole nanocomposite exhibited the retained porous structure, such as mesoporous carbon with a three-dimensionally connected pore system after intercalation of the polypyrrole layer. In addition, the controllable addition of pyrrole monomer can provide the mesoporous carbon-polypyrrole nanocomposites with a tunable amount of polypyrrole and texture property. The polypyrrole layer improved the electrode performance in the electrochemical double layer capacitor. This improved electrochemical performance was attributed to the high surface area, open pore system with three-dimensionally interconnected mesopores, and reversible redox behavior of the conducting polypyrrole. Furthermore, the correlation between the amount of polypyrrole and capacitance was investigated to check the effect of the polypyrrole layer on the electrochemical performance.

Effect of Conducting Carbon Layer on AC Thin Film EL Device

  • Park, Lee-Soon;Baek, Jeong-Ju;Park, Jin-Woo;Kim, Dae-Yong;Bae, Sung-Choon
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.917-919
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    • 2003
  • The effect of conducting carbon layer on the performance of AC thin film EL display was examined. It was found that incorporation of small amount of carbon nano-tube and conducting additive greatly improve the luminance of the inorganic EL compared to the one with only conducting carbon black.

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Electromechanical actuators using conducting polymer composite films (전도성 복합재료 필름을 응용한 Electromechanical actuators)

  • Chang Jin hee;Kim Suk Young;Im Seung Soon
    • Proceedings of the Korean Fiber Society Conference
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    • pp.303-304
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    • 2003
  • Conducting polymers show several unique features, wherein electrical and optical properties change drastically during electrochemical reaction. By making use of these phenomena, several electronic devices have been fabricated, for instance, electrochromic displays, rechargeable batteries and electroplasticity memory devices. Electromechanical actuators using conducting polymers have been proposed by Baughman et. al [1]. (omitted)

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RF Gas Sensor Using 4-Port Hybrid Coupler with Conducting Polymer (전도성 고분자 물질이 결합된 하이브리드 커플러를 적용한 RF 가스 센서)

  • Lee, Yong-Joo;Kim, Byung-Hyun;Lee, Hee-Jo;Hong, Yunseog;Lee, Seung Hwan;Choi, Hyang Hee;Yook, Jong-Gwan
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.1
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    • pp.39-46
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    • 2015
  • In this paper, a gas sensor using a modified $90^{\circ}$ hybrid coupler structure with conducting polymer which operates at 2.4 GHz is represented. Conducting polymers are used to the gas sensing material in proposed sensors. The conducting polymer varies its electrical property, such as work function and conductivity corresponding to the certain gas. To verify this variation of electrical property of conducting polymer at microwave frequencies, the conducting polymer is incorporated with the $90^{\circ}$ hybrid coupler structure, and this proposed sensor operates as reflection type variable attenuator and variable phase shifter. The conducting polymer is employed as impedence-variable transmission lines that cause a impedance mismatching between the general transmission line and conducting polymer. The experiment was conducted with 100 ppm ethanol gas at temperature of $28^{\circ}C$ and relative humidity of 85 %. As a result, the amplitude deviation of $S_{21}$ is 0.13 dB and the frequency satisfying ${\angle}S_{21}=360^{\circ}$ is shifted about 2.875 MHz.

A review on conducting polymer reinforced polyurethane composites

  • Khatoon, Halima;Ahmad, Sharif
    • Journal of Industrial and Engineering Chemistry
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    • v.53
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    • pp.1-22
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    • 2017
  • With the endless efforts in the development of polymer composite materials, conducting polymer reinforced in polyurethane (CP/PU) composites are gaining tremendous attention of scientific community in the past few years. Conducting polymers as a reinforcement, offers exceptional properties when it combines with the thermoplastic polyurethane matrix. In view of this, we critically highlight the development of different types of conducting polymers reinforced in polyurethane composites, with a detailed discussion on their method of synthesis and various characterizations techniques. Furthermore, the promising applications of CP/PU composites have also been discussed. Finally, we attempted to assemble the existing challenges and the possible future perspectives.