• Proceedings of the Korean Fiber Society Conference
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• 1989.06a
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• pp.41.1-41
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• 1989

• 한국전기화학회:학술대회논문집
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• 1998.10a
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• pp.12-12
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• 1998

• Proceedings of the Korean Fiber Society Conference
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• 1993.06a
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• pp.40-40
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• 1993

• Proceedings of the Korean Fiber Society Conference
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• 1993.06b
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• pp.173-177
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• 1993

• Journal of the Korean Electrochemical Society
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• v.13 no.4
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• pp.240-245
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• 2010

This work explored the catalytic effect of Pt in multi-wall carbon nanotube and poly-pyrrole conductive polymer electrocatalysts (Pt/PPy/MWCNT). A home-made Pt/PPy/MWCNT catalyst was first evaluated by comparing its electrochemical active surface area (ESA) with E-Tek commercial catalysts by cyclic voltammetry in $H_2SO_4$ solution. Then, the methanol oxidation currents of Pt/PPy/MWCNT and the hydrogen peaks in $H_2SO_4$ solution were serially measured with microporous electrode. This provided the current density of methanol oxidation based on the ESA, allowing a quantitative comparison of catalytic activity. The current densities were also measured for Pt/C catalysts of E-Tek and Tanaka Precious Metal Co. The current densities for the different catalysts were similar, implying that catalytic activity depended directly on the ESA rather than charge transfer or electronic conductivity.

• Bulletin of the Korean Chemical Society
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• v.32 no.4
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• pp.1215-1220
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• 2011

An electrochemically-modified electrode [P(EDOP-SWNTs)/GCE] was prepared by electropolymerization of 3,4-ethylenedioxy pyrrole (EDOP) single-walled carbon nanotubes (SWNTs) on the surface of a glassy carbon electrode (GCE) and characterized by SEM, CV, and DPV. This modified electrode was employed as an electrochemical biosensor for the selective determination of serotonin concentrations at pH 7.4 and exhibited a typical enhanced effect on the current response of serotonin with a lower oxidation overpotential. The linear response was in the range of $1.0{\times}10^{-7}$ to $1.0{\times}10^{-5}$ M, with a correlation coefficient of 0.998 on the anodic current. The lower detection limit was calculated as 5.0 nM. Due to the relatively low currents and difference of potentials in the electrochemical responses of uric acid (UA), ascorbic acid (AA), and dopamine (DA), the modified electrode was a useful and effective sensing device for the selective and sensitive serotonin determination in the presence of UA, AA, and DA.

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.81-82
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• 2006

In this study, the applications of the block copolymer thin films are introduced. For this purpose, we first obtained cylindrical nanodomains in polystyrene-block-poly(methyl methacrylate) copolymer perpendicularly oriented to a substrate. Then, nanoporous templates were prepared after removing the PMMA nanodomains by UV treatment. By using electropolymerization, high density nanowire arrays of conducting polymer of poly(pyrrole) and poly( 3-hexyl thiopene) were obtained and their electric properties were measured. Also, these nanoporous thin films were found to be very useful for the separation of human Rhinovirus type 14 (HRV 14), major pathogen of a common cold in humans, from the buffer solution.

• Proceedings of the Polymer Society of Korea Conference
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• 2006.10a
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• pp.312-312
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• 2006

Block copolymers with well-defined nanoscopic structures have recently gained much attention for their potential uses as functional nanostructures. Here, we show that nanoporous templates made from polystyrene-block-poly (methyl methacrylate) (PS-b-PMMA) satisfy a novel design concept. At first, arrays of nanoscopic cylindrical microdomains oriented normal to the surface can easily be prepared. Then, we fabricated ultra high density arrays of conducting polymer as poly(pyrrole) (Ppy) and poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires with diameters of $25{\sim}40\;nm$ on the ITO glass by electropolymerization of the monomers inside nanoholes. These high density arrays of conducting polymer nanowires could be used as P-type materials for photovoltaic devices.

• Macromolecular Research
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• v.10 no.4
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• pp.215-220
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• 2002

The electrorheological (ER) and dielectric behaviors of the polypyrrole(PPy)-coated poly(ethyl methacrylate)(PEMA) suspensions in mineral oil were investigated. PPy was coated on PEMA particles to enhance the particle polarization, which would lead to the enhanced ER response. Various PPy-coated PEMA particles were synthesized by controlling the oxidant amount during the pyrrole polymerization, and the ER responses of their suspensions were investigated. The ER response initially increases with the oxidant amount, passes through a maximum, and then decreases with the oxidant amount. The initial increase in the ER response with oxidant amounts is due to the enhanced particle polarization with the increased particle surface conductivity. The dielectric properties of the corresponding suspensions support that the ER enhancement arises from the enhanced particle polarization. The decrease in the ER response at large oxidant amounts seems to arise from the increased conduction between the PPy-coated PEMA particles.

• Proceedings of the KIEE Conference
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• 1999.07d
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• pp.1660-1663
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• 1999

혈액 내의 요소 농도는 신장병 진단의 척도로서 정확한 측정이 필요하다. 요소의 농도는 전위차법을 이용하여 정확히 검출할 수 있으며 이를 위하여 효소를 고정화시킨 전극형 센서를 사용하였다. 전도성 고분자로서 P3MT(Poly(3-methylthiophene) )와 PPy(polypyrrole)를 효소 고정화에 이용하였다. PPy는 전기적 특성이 좋고 중합 및 효소의 고정화가 용이하며 중합 과정이 상대적으로 신속하고 비용도 저렴하다는 장점은 있으나. 다소 불안정하다. P3MT는 PPy와 마찬가지로 전극 상에 단량체가 전기적 산화에 의하여 중합되고 일반적으로 전해질 이온이 도우핑된 상태나 도우핑 되지 않은 상태 모두에서 산소. 습도. 온도에 대하여 매우 안정하다. 본 연구에서는 3-methylthiophene과 pyrrole을 전기 중합하여 urease를 고정화한 요소센서의 특성(감도, 안정성, 직선성)을 비교하였다. P3MT를 이용한 센서와 PPy를 이용한 센서 각각에 대해 감도는 P3MT가 32.3mV/decade, PPy가 4.7mV/decate로서 P3MT가 우수하였고 직선성도 보다 뛰어났으며 순환 전압 전류 곡선을 분석한 결과 P3MT가 PPy보다 안정성도 우수한 특성을 보였다.