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Electrochemical Properties of Poly(3-hexylthiophene)/Poly(styrene-sulfonate) Composite
Son, Yongkeun,Kim, Dong-Kyu 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2
본 연구에서는 전도성 고분자를 디튬이온 배터리의 기저물질로서 활용 가능성을 타진하기 위해서 가용성 고분자인 poly(3-hexylthiophene)(P3HT)를 합성하였고 이를 THF용매상에서 poly(styrene sulfonate)(PSS)과 균일하게 혼합하여 복합체를 제조하였다. 이 복합체에 대한 전기화학 특성으로 산화/환원시 도판트로서 음이온이 아닌 양이온이 관여함을 전기화학 수정미량저울 실험을 통하여 확인하였다. 또한 이 복합체 박막은 환원상태에서도 전기 전도도가 약 10^-3(Ωcm)^-1 정도가 되어 전자 포획능력면에서도 뛰어남을 알 수 있었고 따라서 리튬 이온 이차전지 전극물질로서의 가능성을 보여준다 할 수 있다. In this paper, to be useful in an application of lithium ion secondary battery system, we synthesized soluble poly(3-hexylthiophene) (P3HT) and then homogeneously blended with polystyrene sulfonate) (PSS) in THF. We found that unlike pure P3HT film, the mass of P3HT/PSS composite film was decreased on oxidation process and increased on reduction process in an acetonitrile solution of 0.1M lithium perchlorate by EQCM. The mass variation can be explained not by the ClO_4 anion transport but by the Li^+ cation transport. Furthermore, the P3HT/PSS composite showed conductivity of ca. 10^-3(Ωcm)^-1 even at its the reduced state. The results of our investigation implied that the composite could be a good basic electrode material for a Li^+ secondary' battery system.
Two Different Phases of a Conducting Polymer Film Formed by Electrocasting Method
Son, Yongkeun,Kim, Junghyeon,Suh, Su-Jung,Jung, Seung-Bu,Lee, Youngkwan TaylorFrancis 2006 Molecular Crystals and Liquid Crystals Vol.445 No.1
<P>Poly(3-hexylthiophene) has been renowned for having excellent electrochemical reactivity and optoelectronic functionalities. The existence of a pre-peak pair at ~0.7 V in the polymerization CV could be noticed in several references. Because this pre-peak pair is almost enveloped into the broad main peak pair. Especially the existence of them in the CV obtained from monomer free electrolyte is hardly noticed. There have been many different interpretations for the existence of the pre-peak pair. This research was to examine the appearance of the pre-peak by using new approach of electrocasting of polymer from solution.</P>
한국 근대수학교육의 아버지 이상설(李相卨)이 쓴 19세기 근대화학 강의록 『화학계몽초(化學啓蒙抄)』
Son, Yongkeun,Kim, Chae Sik,Lee, Sang-Gu,Lee, Jae Hwa 강원경기수학회 2012 한국수학논문집 Vol.20 No.4
본 원고는 한국 근대 수학교육의 아버지 이상설(李相卨, 1870-1917)이 자연과학-화학-에 기여한 내용을 다루고 있다. 이상설은 "수리(數理)"를 쓴 시기를 전후하여, 같은 시기에 붓으로 총 46쪽에 달하는 "화학계몽초(化學啓蒙抄)"를 필사하였다. 분석해 본 결과 그 원전은 영국인 H. E. Roscoe(羅斯科, 1833-1915)가 1876년 발간한 Science Primers: Chemistry를 영국인 선교사 Joseph Edkins(艾約瑟, 1823-1905)가 번역하여 1886년에 간행한 "화학계몽(化學啓蒙)"으로 "서학계몽(西學啓蒙)" 16종 가운데 하나이다. Sang-Seol LEE wrote a manuscript HwaHakGyeMongCho(化學啓蒙抄) in the late 19th century. HwaHakGyeMongCho was transcribed from Science Primers: Chemistry (written by H. E. Roscoe), which is translated into Chinese by Joseph Edkins in 1886. LEE did not copy original writing exactly, but he understood the contents of each chapter and sections, then summarized and edited them in his caligraphic writing. In this paper, we introduce the contents for the first time and discuss the significance of this book.
Fabrication of PAN/Pt Composite Electrode for Direct Methanol Oxidation in Aqueous Media
He, Miaomiao,Choi, Jungsik,Son, Yongkeun,Lee, Youngkwan,Yoon, Dae-Ho,Suh, Su-Jeong TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.464 No.1
<P> This study was focused on the preparation and characterization of conducting polymer and metal composite, PAN/Pt, electrodes showing catalytic activity in acidic aqueous media. Electropolymerization deposited PAN thin film on ITO and this film was used as a Pt matrix. The polyaniline (PAN) matrix could adopt Pt particles catalysts into polymer itself visa either way of spontaneous reaction between PAN and PtCl62- or electrochemical reduction of the Pt (IV). Both procedures ended up with the formation of PAN/Pt composites. In-situ spectroelectrochemistry was used to investigate the composite formation processes. These composite electrodes were identified with SEM and EDAX. Catalytic decomposition of methanol on these electrodes was observed by using cyclic voltammetry method.</P>
Polymerization of 3TUTS SAM Formed on ITO Substrates
Choi, Sung Jin,Son, Yongkeun,Lee, Youngkwan,Kim, Kyo-Hyeok,Chung, Il-Sub TaylorFrancis 2007 Molecular Crystals and Liquid Crystals Vol.471 No.1
<P> Surface modification of ITO with polythiophene derivative, poly(3-TUTS), was done for molecular electronic device application purpose. In order to prepare a derivative of polythiophene having n-alkyltrichlorosilane at 3-position of the thiophene ring, the monomer of thienyl-functionalized n-alkyltrichlorosilane, 11-(3-thienyl)undecyltrichlorosilane (3TUTS), was synthesized. The monomer was identified by using NMR, UV/VIS spectroscopic methods. Surfaces of ITO substrates were modified with the synthesized 3TUTS to get SAM on them. Polymerization of the SAM was done by dipping this SAM into FeCl3 solution. The polymer have been identified by using Cyclic Voltammetry, UV/VIS spectroscopy, scanning electron microscopy (SEM), DFM (Dynamic Force Microscopy) image analysis.</P>