[논문]전기화학 증착법을 이용한 그래핀 개질 Indium Tin Oxide 전극 제작 및 효소 전극에 응용

왕설; 시키; 김창준

doi:10.9713/kcer.2022.60.1.62

전기화학 증착법을 이용한 그래핀 개질 Indium Tin Oxide 전극 제작 및 효소 전극에 응용
Fabrication of Graphene-modified Indium Tin Oxide Electrode Using Electrochemical Deposition Method and Its Application to Enzyme Electrode 원문보기

Korean chemical engineering research = 화학공학, v.60 no.1, 2022년, pp.62 - 69

왕설 (경상국립대학교 화학공학과 및 그린에너지 연구소) , 시키 (경상국립대학교 화학공학과 및 그린에너지 연구소) , 김창준 (경상국립대학교 화학공학과 및 그린에너지 연구소)

초록
AI-Helper

그래핀은 부피에 비해 표면적이 넓고 뛰어난 기계적 물성과 전기전도성을 가지며 생체적합성이 우수하다. 본 연구에서는 전기화학적 방법을 이용하여 indium tin oxide (ITO) 글래스 슬라이드 표면에 산화그래핀을 증착·환원시킨 전극을 제작하였고 그래핀으로 표면 개질된 ITO의 전기화학적 특성을 조사하였다. 산화그래핀의 증착과 환원에 순환전압전류법을 사용하였다. 주사전자현미경과 에너지 분산형 X-선 분광법을 사용하여 그래핀이 코팅된 ITO 표면을 관찰하였다. 순환전압전류법과 전기화학 임피던스 분광법을 사용하여 제작된 전극들의 전기화학 특성을 평가하였다. 사이클 수와 주사 속도는 산화그래핀 증착과 환원도에 상당한 영향을 미쳤으며 제작된 전극의 전기화학 특성도 달랐다. ITO 전극에 비하여 그래핀으로 표면 개질된 ITO는 전극 계면에서의 전하 전달 저항이 낮았고 더 많은 전류를 생산하였다. 그래핀으로 표면 개질된 ITO 표면에 고정화된 포도당 산화효소는 포도당을 산화시키며 성공적으로 전자들을 생성하였다.

Abstract ▼ AI-Helper

Graphene has a large surface area to volume ratio and good mechanical and electrical property and biocompatibility. This study described the electrochemical deposition and reduction of graphene oxide on the surface of indium tin oxide (ITO) glass slide and electrochemical characterization of graphen-modified ITO. Cyclic voltammetry was used for the deposition and reduction of graphene oxide. The surface of graphen-coated ITO was characterized using scanning electron microscopy and energy dispesive X-ray spectroscopy. The electrodes were evaluated by performing cyclic voltammetry and electrochemical impedance spectroscopy. The number of cycles and scan rate greatly influenced on the coverage and the degree of reduction of graphene oxide, thus affecting the electrochemical properties of electrodes. Modification of ITO with graphene generated higher current with lower charge transfer resistance at the electrode-electrolyte interface. Glucose oxidase was immobilized on the graphene-modified ITO and has been found to successfully generate electrons by oxidizing glucose.

주제어

표/그림 (8)

그림 Fig. 2. Cyclic voltammetry cycles of electrochemical (a) deposition of GO on ITO and (b) reduction of ITO-GO to ITO-rGO with scan rate of 10 mV/s. The insets show the pictures of ITO, ITO-GO, and ITO-rGO.
그림 Fig. 1. (a) Electrochemical cell for fabrication of graphene-modified ITO, (b) schematic illustration of fabrication of ITO-GO and ITO-rGO, and small volume cell for electrochemical analysis of electrodes.
그림 Fig. 3. SEM images and EDS results of (a) ITO-GO and (b) ITO-rGO.
그림 Fig. 5. SEM images of ITO-GO prepared at different scan rates: (a) bare ITO, (b) ITO-GO (10 mV/sec), (c) ITO-GO (20 mV/sec), and (d) ITO-GO (50 mV/sec).
그림 Fig. 4. (a) Cyclic voltammograms and (b) Niquist plots of impedance measurement of ITO-rGOs prepared with different number of cycles at the GO-deposition step but the same number of cycles for GO reduction. The inset shows the plot of current density versus number of cycles for ITO-rGO.
그림 Fig. 6. Cyclic voltammograms of ITO-rGO prepared with different scan rates at the GO-deposition step. The inset shows the plot of current density versus scan rates for ITO-rGO.
그림 Fig. 7. Cyclic voltammograms of ITO-rGO prepared with different number of cycles at GO-reuction step but the same number of cycles for GO deposition. The inset shows the plot of current density versus number of cycles for ITO-rGO.
그림 Fig. 8. Cyclic voltammograms of D30-R30 with and without GOx immobilization.

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