• 제목/요약/키워드: Electrochemical polymerization

검색결과 112건 처리시간 0.027초

전기화학적 중합으로 제조된 ABS/PPy 복합 박막의 전도특성 (Conducting Characteristics of ABS/PPy Composite Film Prepared by Electrochemical Polymerization)

  • 김진;윤도영;김대흠;한춘;김상용
    • 전기화학회지
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    • 제5권3호
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    • pp.164-167
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    • 2002
  • 본 연구에서는 ABS(Acrylonitrile-Butadiene-Styrene)을 주-고분자로 사용하여 산화안정성이 개선된 ABS/Polypyrrole 복합박막을 전기화학적 방법으로 합성하였다 우선 acetonitrile계의 용매로 주-고분자를 팽창시켰으며, pyrrole과 지지전해질이 백금전극에 미리 코팅된 ABS내부로 투과하여 백금 전극표면에 ABS/PPy복합체가 형성되도록 하였다. 결과적으로 전도성 ABS/PPy 복합박막은 polypyrrole과 비교하여 일정한 저항을 유지하였으며, 산화안정성도 향상되는 것으로 나타났다.

옥살산과 몰리브덴산나트륨 전해액에서 냉연강판에 전해중합된 폴리아닐린 피막의 특성 (Characterization of Electro-Polymerized Polyaniline Film on the Cold Rolled Sheet in the Oxalic acid and Sodium Molybdate Electrolyte)

  • 임기영;윤정모;기준서;장용석
    • 한국재료학회지
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    • 제16권6호
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    • pp.386-393
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    • 2006
  • Increasing environmental concerns require to solve the problem produced due to the use of heavy metals in coating formulations. Therefore, it is necessary to develop new coating strategy employing inherently conducting polymers such as polyaniline. Polyaniline is a conductive polymer that is synthesized by oxidation polymerization, and the electrochemical and chemical polymerization are possible for the oxidation of aniline. Electrochemical oxidation polymerization produces a fine surface and although voltage control is more convenient, it require electrolytic cells, and elaborate thin film can be acquired with the polymerization. Polyaniline films were electro-polymerized on cold rolled sheets using the galvanostat mode in the oxalic acidaniline-sodium molybdate electrolyte. The structure and properties of polyaniline film were studied using Potentiostat/Galvanostat 263A, FE-SEM,, AFM, SST, Colorimetry. A high corrosion resistance of polyaniline film was observed with an increase of corrosion potential by $500{\sim}600$ mV for the substrate covered with polyaniline.

PARAMETER STUDY ON PLASMA-POLYMERIZATION OF LANTHANIDE DIPHTHALOCYANINE FILMS FOR ELECTROCHEMICAL DEVICES

  • Kashiwazaki, Naoya;Yamana, Masao
    • 한국표면공학회지
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    • 제29권6호
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    • pp.739-744
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    • 1996
  • Lanthanide diphthalocyanines have interesting properties on electrochemical and chemical redox reactions. It is however, difficult to use because of thier short device life. Plasma-polymerization attends to improvement thier device life. Yb-diphthalocyanine ($YbPc_2$) polymer film was deposited in a parallel plate electrodes-type RF plasma reactor. $YbPc_2$ was sublimed into the argon plasma, and polymer film was obtained on a substrate. Radio frequency was constant of 13.56MHz. Pressure of argon gas, sublimation rate of $YbPc_2$ and RF power were variable parameters depending on film quality. Surface of polymer films include a lot of sub-micron order lumps. It was indicated that size of lumps depends on polymerization degree controled by parameters. Size of lumps and polymerization degree are increased with RF power. However, by the high RF power over 40W, polymerization degree is decreased with RF power and surface of film is rough. In condition of RF power is high, polymerization will compete with etching of film. We obtained good films for electrochromic display with RF power of 20W, argon gas pressure of 8.0 Pa and sublimationrate of $1.2 \times 10$ mol/min, and good films for gas sensor with RF power of 30W, argon gas pressure of 10.6Pa and sublimation rate of $1.2 \times 10$ mol/min.

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High sensitivity biosensor for mycotoxin detection based on conducting polymer supported electrochemically polymerized biopolymers

  • Dhayal, Marshal;Park, Gye-Choon;Park, Kyung-Hee;Gu, Hal-Bon
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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    • pp.243.1-243.1
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    • 2010
  • Devices based on nanomaterials platforms are emerging as a powerful tool for ultrasensitive sensors for the direct detection of biological and chemical species. In this talk, we will report the preparation and the full characterization of electrochemical polymerization of biopolymers platforms and nano-structure formation for electrochemical detection of enzymatic activity and toxic compound in electrolyte for biosensor applications. Formation of an electroactive polymer film of two different compounds has been quantified by observing new redox peak at higher potentials in cyclic voltammogram measurements. RCT value of at various biopolymer concentration based hybrid films has been obtained from electrochemical impedance spectroscopy analysis and possible mechanism for formation of complexes during electrochemical polymerization on conducting substrates has been investigated. Biosensors developed based on these hybrid biopolymers have very high sensitivity.

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Ethylene Oxide기를 갖는 Acrylate계 Gel Polymer Electrolyte의 전기화학적 특성에 관한 연구 (A Study on Electrochemical Properties of Acrylate-based Gel Polymer Electrolyte with Ethylene Oxide Group)

  • 김현수;신정한;문성인;오대희
    • 한국전기전자재료학회논문지
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    • 제17권6호
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    • pp.608-614
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    • 2004
  • The gel polymer electrolyte was prepared by radical polymerization using tetra(ethylene glycol) diacrylate and tri(ethylene glycol) dimethacrylate to investigate affect of the number of ethylene oxide. The gel polymer electrolyte showed good electrochemical stability up to 4.5 V vs. Li/Li and high ionic conductivity at various temperatures. The lithium-ion polymer batteries with the gel polymer electrolyte, tetra(ethylene glycol) diacrylate- and tri(ethylene glycol) dimethacrylate-based, also represented good electrochemical performances such as rate capability, low-temperature performances and cycleability. However, the cell with tri(ethylene glycol) dimethacrylate, which has three ethylene oxide, showed better electrochemical performance.

전기화학적 중합온도가 Binary 도핑된 키랄 Polyaniline 모폴로지에 미치는 영향 (Influence of Electrochemical Polymerization Temperature on the Morphology of Binary-doped Chiral Polyaniline)

  • 김은옥;김영환
    • 대한화학회지
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    • 제58권5호
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    • pp.456-462
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    • 2014
  • (+)-Camphorsulfonic acid (CSA)와 hydrochloric acid (HCl)로 binary 도핑된 키랄 polyaniline (PAni)을 중합온도 $0^{\circ}C$와 상온(RT)에서 전기화학적 중합법으로 합성하였다. 순환전압전류 곡선, FT-IR과 circular dichroism spectra로부터 PAni는 각각 (+)-CSA와 HCl로 single 도핑된 PAni 혼합물이 아닌, binary 도핑된 키랄 PAni임을 확인하였다. 중합온도가 전기화학적 거동과 도핑레벨에 영향을 주었고, 이에 따라서 PAni의 결정성과 모폴로지가 변화되는 것을 확인하였다. 중합온도가 $0^{\circ}C$에서 RT로 상승됨에 따라 키랄PAni의 모폴로지가 fibrous에서 short-fibrous구조로 변화되었다. ITO 위에 적층된 PAni필름의 면저항을 4-point probe 법으로 측정하였다.

전기화학캐패시터용 MWNT 및 MWNT/DAAQ 나노 복합체의 제조 및 전기화학적 거동 (Preparation and Electrochemical Behavior of MWNT and MWNT/DAAQ Nanocomposite Materials for Electrochemical Capacitor)

  • 김홍일;박수길
    • 전기화학회지
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    • 제10권3호
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    • pp.169-174
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    • 2007
  • 화학적 중합방법을 이용하여 HWNT/DAAQ를 합성하여 전기화학적 캐패시터용 전극 소재로서 전기화학적 특성을 연구하였다. XRD pattern 결과에서 MWNT/DAAQ의 표면에 DAAQ가 oligomer 상태로 존재하는 것을 확인 하였으며, SEM image를 통해 표면을 관찰하였고, TCA를 통해 열적안정성을 확인하였다. 활성탄과 MWNT/DAAQ에 기초한 전극의 용량은 1M의 $H_2SO_4$ 전해질 상에서 97F/g의 비방전용량을 확인되었으며, 또한 HWNT/DAAQ 복합 전극은 우수한 전기화학적 거동을 보이는 것을 관찰하였다.

정전위 전해 중합법에 의한 폴리피롤 제조 및 전기화학적 특성 (Preparations and Electrochemical Characteristics of Polypyrrole by Constant Potential Electroplymerization)

  • 조승구;심철호
    • 전기화학회지
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    • 제8권2호
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    • pp.99-105
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    • 2005
  • 본 연구에서는 정전위 전해중합법으로 음이온 크기가 다른 도펀트를 사용하여 폴리피를 전극을 제조하였으며, CV 및 교류 임피던스법을 이용한 전기화학적 분석 및 형태학적 분석을 통해 제조된 폴리피롤 전극의 특성을 고찰하였다. 제조된 전극을 전기화학적으로 분석한 결과 $PPy/CLO_4$전극은 음이온의 도핑$\cdot$탈도핑이, PPy/PVS 전극은 양이온의 탈도핑$\cdot$도핑이 일어나고 있음을 알았다. 합성 전위가 증가할수록 $PPy/CLO_4$ 전극과 PPy/PVS 전극 모두 전하전달저항은 감소하였고, 이중층 용량은 $PPy/CLO_4$전극이 PPy/PVS 보다 큼을 알 수 있었다. 합성 전위 변화에 따른 PPy/PVS 전극 표면의 변화는 상대적으로 $PPy/CLO_4$ 보다 작음을 알 수 있었다

PET Fabric/Poly(3,4-ethylenedioxythiophene) Composite as Polymer Electrode in Redox Supercapacitor

  • Cho, Seung-Hyun;Joo, Jin-Soo;Jung, Bo-Ram;Ha, Tae-Min;Lee, Jun-Young
    • Macromolecular Research
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    • 제17권10호
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    • pp.746-749
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    • 2009
  • Poly(ethylene terephthalate) (PET) fabric/poly(3,4-ethylenedioxythiophene) (PEDOT) composite with stable and high electrochemical activity was fabricated by chemical and electrochemical polymerization of 3,4-ethylenedioxythiophene (EDOT) on a PET fabric in sequence. Effects of polymerization conditions on the following characteristics of the composite were studied: electrical conductivity and surface morphology. The electrochemical properties were also investigated by cyclic voltammetry and cyclic charge/discharge experiments. The specific volume resistivity, electrical conductivity and specific discharge capacitance of the composite were 0.034 $\Omega-cm$ and 25 S/cm, and 54.5 F/g, respectively.

Stability and Electrochemical Characteristics of Polyaniline Salt Films in 1 N HCl Solution

  • 조정환;오응주;요철현
    • Bulletin of the Korean Chemical Society
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    • 제17권8호
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    • pp.715-719
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    • 1996
  • Thin films of polyaniline (PANI) salts were in situ deposited on a Pt plate during either chemical polymerization or electrochemical polymerization. The oxidation states of the salt films were controlled by the applied DC potential. AC impedance of the Pt/PANI electrode were measured in monomer-free 1 N HCl solution in order to investigate the electrodic properties of the films at the following applied DC potentials: 0, 0.45 and 0.75 V vs. SCE. Very small differences in film conductivity according to its oxidation state were observed by analysis of the impedance spectra, the reasons of which are complicated by enriched water content in the film and possible decrease in the film thickness during the measurements. The electrochemical activity of the film/solution interface varied with its oxidation state. Stability of the film in 1 N HCl solution was also evaluated by impedance and cyclic voltammetry measurements.