전기화학적 중합온도가 Binary 도핑된 키랄 Polyaniline 모폴로지에 미치는 영향
Influence of Electrochemical Polymerization Temperature on the Morphology of Binary-doped Chiral Polyaniline
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초록
(+)-Camphorsulfonic acid (CSA)와 hydrochloric acid (HCl)로 binary 도핑된 키랄 polyaniline (PAni)을 중합온도 0 oC와 상온(RT)에서 전기화학적 중합법으로 합성하였다. 순환전압전류 곡선, FT-IR과 circular dichroism spectra로부터 PAni는 각각 (+)-CSA와 HCl로 single 도핑된 PAni 혼합물이 아닌, binary 도핑된 키랄 PAni임을 확인하였다. 중합온도가 전기화학적 거동과 도핑레벨에 영향을 주었고, 이에 따라서 PAni의 결정성과 모폴로지가 변화되는 것을 확인하였다. 중합온도가 0 oC에서 RT로 상승됨에 따라 키랄PAni의 모폴로지가 fibrous에서 short-fibrous구조로 변화되었다. ITO 위에 적층된 PAni필름의 면저항을 4- point probe 법으로 측정하였다.
Abstract
Binary-doped conducting chiral polyaniline (PAni) was synthesized by electrochemical polymerization of aniline at low-temperature (0 oC) and room-temperature (RT) conditions. (+)-Camphorsulfonic acid (CSA) and hydrochloric acid (HCl) were used as a binary dopant. Formation of the binary-doped PAni rather than a mixture of the corresponding singledoped PAni was confirmed by cyclic voltammogram, FT-IR and circular dichroism spectra. The temperature influenced the electrochemical behavior and doping level, thus determining the crystallinity and morphology of the PAni. However, among other results, morphology of the PAni is found to be most strongly depends on the polymerization temperature. With increased temperature from the initial state to RT, morphology of the PAni changed from fibrous to short-fibrous structure. The sheet resistance of the PAni films on an ITO was measured by using four-point probe dc method.
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