헤마타이트 전극에서의 빛-유도 전기화학을 이용한 PEDOT 패터닝 연구

다국어 초록 (Multilingual Abstract)

In this study, we describe a method for fabricating micro-patterned PEDOT on a metal oxide substrate using light-addressable electrochemistry (LAE) process with a digital micromirror device (DMD) light modulator. Poly(3,4- ethylenedioxythiophene) (PEDOT) is one of the most popular commercial conducting polymer due to its high conductivity, high electrochemical activity, good biocompatibility, and environmental stability. The LAE patterning involves selectively illuminating specific regions of a photoconductive semiconductor and applying voltage, which confines redox reactions to these areas, allowing for the deposition of metals or polymers. This approach is fast, single-step, and eliminates the need for physical masks, templates, or inks. The DMD system, controlled via software, projects the patterned light onto the surface of the substrate through a microscope. We used an n-type semiconductor hematite (α-Fe2O3), which has a short hole diffusion length (Lp, 2-4 nm) making it suitable for application in LAE, as the photoelectrode. Locally stimulated hematite generates holes that reduce the overpotential for electrochemical reactions. When an appropriate voltage is applied, this enables selective photo- induced electrochemical polymerization of the EDOT (3,4- ethylenedioxythiophene) in the illuminated regions. The minimum line width of the patterned PEDOT was ~10 μm, and various digital images were successfully patterned. The patterned PEDOT was characterized through FT- IR mapping, and the electrochemical performance of the fabricated PEDOT patterns on hematite was demonstrated using electrochemiluminescence (ECL) with luminol.

목차 (Table of Contents)

• 영문초록 i
• 목차 ii
• 그림 목차 iv
• 표 목차 v
• 제 1 장 서론 1
• 1.1 전도성 고분자 (Conducting polymer) 1
• 1.1.1 PEDOT (Poly(3,4-ethylenedioxythiophene)) 1
• 1.1.2 PEDOT과 금속 산화물 하이브리드 2
• 1.1.3 PEDOT 패터닝 3
• 1.2 빛-조절 전기화학 (Light-addressable electrochemistry) 7
• 1.2.1 빛-조절 전기화학의 원리 7
• 1.2.2 Hematite (α-Fe2O3) 8
• 1.2.3 빛-조절 전기화학을 이용한 전도성 고분자 패터닝 9
• 1.3 연구의 목적 11
• 제 2 장 실험 13
• 2.1 시약 및 기기 13
• 2.1.1 시약 13
• 2.1.2 기기 13
• 2.2 Hematite 합성 14
• 2.3 빛-조절 전기화학을 이용한 PEDOT 패터닝 15
• 2.4 패터닝한 PEDOT에서의 전기화학발광 측정 및 이미징 15
• 제 3 장 실험 결과 및 고찰 17
• 3.1 Hematite 합성 17
• 3.2 Hematite 전극에서의 PEDOT 합성 및 전기화학적 거동 17
• 3.3 빛의 세기에 따른 PEDOT의 광전기화학적 중합 23
• 3.4 PEDOT 패터닝 25
• 3.5 패턴화된 PEDOT 특성화 30
• 3.6 Hematite 전극 위 패터닝된 PEDOT의 전기화학발광 34
• 제 4 장 결론 38
• 참고문헌 39