화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.29, No.4, 363-368, July, 2005
Export Citation
Iron(III)-p-toluenesulfonate로 합성된 Poly(3,4-ethylenedioxythiophene)의 전하전달현상에 미치는 유기용매의 영향
Solvent Effects on the Charge Transport Behavior in Poly(3,4-ethylenedioxythiophene) Synthesized with Iron(III)-p-toluenesulfonate
박창모†, 김태영, 김원중, 김윤상, 서광석
  • 고려대학교 공과대학 신소재공학과
Chang Mo Park†, Tae Young Kim, Won Jung Kim, Yun Sang Kim, and Kwnag S. Suh
  • Department of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
E-mail:
초록
Iron(III)-p-toluenesulfonate를 개시제로 한 3,4-ethylenedioxythiophene(EDOT)의 중합과정시 여러 가지 유기용매를 첨가했을 때 poly(3,4-ethylenedioxythiophene)(PEDOT)의 전하이동특성이 어떻게 변하는지에 대해 연구하였다. 첨가한 유기용매의 종류는 MeOH, EtOH 등의 알콜류와 Acetone, MEK 등의 케톤류였으며, 직류 전기전도도 측정시 280 K에서 전도도는 MeOH를 첨가한 시료가 19.5 S/cm로 가장 높았으며, MEK를 첨가한 시료는 2.2X10-9 S/cm로 각기 다른 전도도를 나타내었다. 유기용매 첨가에 따른 전기전도도의 변화를 설명하기 위해 X-ray diffraction(XRD)를 통한 PEDOT의 구조적 변화를 관찰하였으며, 알콜류를 첨가했을 경우 결정화도가 증가하는 반면, 케톤류의 유기용매를 첨가했을 경우에는 무정형 구조를 가지는 것을 관찰하였다. 또한 X-ray photoelectron spectroscopy(XPS)를 이용하여 S(2p) 피크를 분석한 결과 케톤류를 첨가한 시료의 경우 다른 시료에 비해 도핑레벨이 매우 낮음을 관찰하였다. 이는 유기용매와 PEDOT의 상대이온인 p-toluenesulfonate와의 상호작용으로 인한 것으로 중합시 유기용매의 첨가에 따라 PEDOT의 도핑효율 및 구조가 변화하고 결과적으로 전기전도도갑 ㅕㄴ화하는 것을 확인하였다.
The effects of organic solvent on the charge transport behavior of poly(3,4-ethylenedioxythiophene)/p-toluenesulfonate(PEDOT-OTs) are investigated. The use of different organic solvents during the oxidative chemical polymerization of 3,4-ethylenedioxythiophene(EDOT) with Iron(III)-tosylate can greatly vary the DC conductivity of PEDOT-OTs along with molecular structure and doping concentration. For example, PEDOT-OTs prepared from methanol shows the conductivity of 19.5 S/cm, which is an increase by a factor of 108 compared to PEDOT-OTs prepared from acetone. From the X-ray diffraction (XRD) experiments, it was found that PEDOT-OTs with ketone is amorphous state, while PEDOT-OTs with alcoholic solvent shows the better defined crystalline structure in which the charge transport along and between the PEDOT chains are promoted. Chemical analysis employing X-ray photoelectron spectroscopy (XPS) revealed that the doping concentration of PEDOT-OTs with alcoholic solvent is much higher than that of PEDOT-OTs with ketones. It is proposed that the interactions between the organic solvent and doping anion can cause the variation in doping concentration and, therefore, result in the PEDOT-OTs of different conductivities and chain structures.
Keywords:charge transport;DC conductivity;poly(3,4-ethylenedioxythiophene) (PEDOT);iron(III)-p-toluenesulfonate (Fe(OTs)3);X-ray photoelectron spectroscopy (XPS).
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