화학공학소재연구정보센터
Polymer(Korea), Vol.39, No.5, 721-726, September, 2015
기상 중합으로 제조된 PEDOT 박막의 산 처리에 의한 2차 도핑
Secondary Doping of Vapor Phase Polymerization Based on Conductive PEDOT Thin Film by Sulfuric Acid Treatment
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초록
기상중합법(VPP)을 이용하여 제조한 poly(3,4-ethylenedioxythiophene) (PEDOT) 박막의 산 처리에 따른 박막의 화학적 구조 변화 및 전도도에 미치는 영향을 고찰하였다. 기상중합을 위해 산화제인 iron(III)-p-toluenesulfonate (FTS)의 함량에 따라 PEDOT 박막의 두께를 변화시켜 전도성 박막의 투과도를 조절할 수 있었다. 황산 처리된 VPP 기반 PEDOT 박막은 약 80%의 투과도와 1000 S/cm 이상의 전기 전도도를 보였다. 박막의 X-ray 결정구조(XRD) 및 광전자 스펙트럼(XPS) 분석으로부터, 황산 처리된 VPP 기반 PEDOT 박막의 전도도 향상은 고분자의 결정구조의 변화가 아니라, p-toluenesulfonate로 도핑된 PEDOT 박막이 황산 수용액에 존재하는 HSO4 - 이온의 치환 및 추가p-도핑 과정을 통한 도핑 수준의 증가에 기인하였다고 판단된다.
This paper reports the effect of sulfuric acid treatment of vapor phase polymerization (VPP) based poly(3,4- ethylenedioxythiophene) (PEDOT) thin film in order to improve electrical property of the conductive film. The transparency of PEDOT film can be controlled by varying the thickness of the film with changing the content of iron(III)- p-toluenesulfonate (FTS) as an oxidant for VPP. Acid treated VPP based PEDOT thin film showed fairly good transparency (~80%) and electrical conductivity (>1000 S/cm). It is postulated that the conductivity enhancement of the PEDOT film caused by not variation of crystalline structure of PEDOT, but additional p-dopings by HSO4 - ion dissociated from sulfuric acid aqueous solution to PEDOT+ chain from the analysis by X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS).
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