• 분석과학
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• 제8권4호
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• pp.603-610
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• 1995

The charge transfer rate in polypyrrole(PPy) electropolymerized within poly(acrylonitrile-co-butadiene)(PAB) was compared with that in PPy deposited Pt electrodes by using cyclic voltammetry, chronoamperometry, and chronopotentiometry in acetonitrile. For both electrodes anodic and cathodic peak currents were proportional to scan rates below 100 mV/sec, but to square root of scan rates beyond 200 mV/sec. The apparent diffusion coefficient of $ClO{_4}^-$ in the PPy/PAB composite is estimated to be 1.6 times larger than that in PPy. The PPy films composited within PAB layer showed higher anodic and cathodic currents and possessed faster charging-discharging process and larger capacity.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 하계학술대회 논문집
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• pp.909-912
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• 2000

We synthesized polypyrrole (PPy) nanotubules by oxidative polymerization of the pyrrole monomer within the pores of a polycarbonate template. The electrochemical behavior was investigated using cyclic voltammetry. The redox potential was about -0.5 V vs. Ag/AgCl reference electrode, while the potential was about 0 V for PPy film. It is considered as the backbone grows according to the pore wall. Therefore, it is possible to be arranged regularly. That leads to improvement in the electron hopping. By electrochemical doping of glucose oxidase (GOx) on PPy nanotubules, an enzyme electrode has been fabricated. The kinetic parameter of biochemical reaction with glucose was evaluated. The formal Michaelis constant and maximum current calculated by computer were about 11.4 mmol $dm^3$ and 170.85 A respectively. Obviously, an affinity for the substrate and current response of the PPy nanotubules enzyme electrode are rather good, comparing with that of PPy film.

• 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

• 센서학회지
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• 제13권1호
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• pp.47-55
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• 2004

This paper presents drug release properties of active drug delivery system (DDS) using volume change of polypyrrole (PPy). The incorporation of various chemical substances into the PPy and controlling its release with the externally applied voltage to the PPy are possible. In order to confirm possibility for drug delivery system qualitatively, indicator(phenol red) was examined as a dopant of PPy. The applied voltage to the PPy electrode was set to -2 V and this negative voltage makes the anionic indicator released in saline solution. After qualitative analysis, in order to confirm quantitative drug release characteristic of PPy, salicylate which is one of the aspirin substance was used as a dopant of PPy. As a result, the salicylate release characteristics with time was thoroughly investigated while varying the electrode area, polymerization time, the applied voltage for drug release. Based on these quantitative results, a preliminary experiment was carried out to check the feasibility of the PPy applicable to the neuronal system.

• 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.

• 폴리머
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• 제25권6호
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• pp.826-832
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• 2001

본 연구에서는 폴리피를 (PPy)/gold/mylar 형태의 두 겹의 전기활성 구동기를 제작하였으며, 도판트의 종류에 따른 굽힘 구동 특성에 관한 연구를 수행하였다. 전도성 고분자는 전기적으로 산화/환원이 될 때에는 도판트의 이동에 의하여 부피 변화를 수반하게 된다. 도판트의 크기에 따라, 서로 다른 구동 특성을 나타내었는데, toluene sulfonate와 같은 작은 크기의 도판트는 산화/환원에 따라 PPy 필름의 내외로 자체 이동이 가능하며, 산화시에 PPy의 팽창이 관찰되었다. 그러나, dodecylbenzenesulfonate와 같은 커다란 도판트가 함유된 PPy는 산화/환원시에는 이들의 이온들은 움직임이 없는 것으로 나타났으며 환원시에 작은 양이온($Na^+$)이 필름내부로 유입되며 부피가 증가하는 현상이 관찰되었다.

• 전기화학회지
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• 제6권2호
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• pp.134-140
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• 2003

기능성 도판트인 dodecylbenzensulfonic acid(DBSA)와 혼합도판트{(DBSA와 $LiClO_4$, NSA(2-naphthalenesulfonic acid), DEHSA[di(2-ethylhexyl)sulfosuccinic acid]}를 사용하여 전기화학적방법에 의한 연신성 폴리피롤(Ppy-DBSA, Ppy-mixed dopants)필름을 제조하였다. 전기화학적 방법에 의해 제조된 폴리피를 괼름은 zone drawing방법을 사용하여 1.0-2.5배 연신시킬 수 있었으며, 연신된 폴리피롤 필름의 전기전도도를 측정하였다. 연신율이 증가함에 따라 필름의 전기전도도가 증가함을 볼 수 있었다. 이 현상은 연신율에 따른 결정성 증가로 설명 할 수 있었다. 1.0-2.5배 연신된 폴리피를 필름(Ppy-DBSA, Ppy-mixed dopants)을 온도변화에 따른 전하 이동 경로는 모두 power raw에 적합함을 볼 수 있었다.

• Journal of Electrochemical Science and Technology
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• 제2권2호
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• pp.91-96
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• 2011

Polypyrrole (PPy)/multi-walled carbon nanotube (MWCNT)/conductive carbon (CC) composites are synthesized by the chemical oxidative polymerization method. The morphology analysis of the composite materials indicates uniform coating of PPy over MWCNTs and conductive carbon. The electrochemical performances of PPy/MWCNT/CC composites with different compositions are evaluated in order to optimize the composition of the composite electrode. Galvanostatic chargedischarge measurements and electrochemical impedance spectroscopy studies prove the excellent cycling stability of the PPy/MWCNT/CC composite electrodes.

• 전기화학회지
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• 제9권4호
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• pp.137-140
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• 2006

In order to overcome the weak actuation and relaxation problems during the deformation of IPMC actuator, polymeric anion (polystyrenesulfonate)-doped polypyrrole(Ppy(PSS)) was electrodeposited onto IPMC actuator. Electrochemical quartz crystal microbalance study showed that hydrated cations were instilled into Ppy(PSS) film and polymeric-anion dopants introduced during polymerization were not expelled. Ppy(PSS)-coated IPMC actuator formed two electrode/electrolyte interfaces, Pt/nafion and Ppy(PSS)/bulk solution, and additive volume expansion phenomena at interfaces induced the large deformation compensating the relaxation of actuation by back diffusion of water.

• 전기화학회지
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• 제14권1호
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• pp.22-26
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• 2011

Polypyrrole (Ppy) nanowire has been electrochemically synthesized via vertically oriented mesoporous silica template. The mesoporous template is also electrochemically deposited on indium tin oxide coated (ITO) glass from tetraethyl orthosilicate (TEOS) and cetyltrimethylammonium bromide (CTAB) surfactant. The highly ordered silica template is demonstrated to be 100~120nm thick with the pores of 4~5 nm diameter by scanning electron microscope (SEM) and transmission electron microscope (TEM). Ppy is formed to fill pores of the silica template from pyrrole solution by electrochemical oxidation. The Ppy in Ppy/silica/ITO composite was found to exhibit reversible electrochemical activity, as characterized by cyclic voltammetry (CV).