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제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Electrochemical Glucose Sensors Based on an Ionic Liquid of a Gold Nanocluster

등록일
2013년 8월 27일 13시 16분 28초
접수번호
0295
발표코드
ELEC.O-1 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 10시 : 00분
발표형식
구두발표
발표분야
전기화학 - Young Electrochemists Symposium
저자 및
공동저자
곽규주, 이동일*
연세대학교 화학과, Korea
Ionic liquids have found many applications in electrochemical sensors due to their ionic conductivity and electrochemical stability over wide potential window. In particular, Ionic liquids maintain the bioactivity of enzymes and reaction rate that makes them ideally suited for the development of biosensors. In this talk, we present that a stable molten salt of a quantum-sized gold nanocluster can be prepared by ion-pairing of a Au25 nanocluster protected with (3-mercaptopropyl)sulfonate with ionic liquid, 1-decyl-3-methylimidazolium, and its application for the detecton of glucose based on its unique electrochemical and biocompatible properties. To prepare electrochemical biosensor, the glucose oxidase (GOx) was immobilized in the Au25 molten salt, which was subsequently cast on a glassy carbon electrode to form modified electrodes. The cyclic voltammogram of the modified electrode exhibited well-defined and reversible redox peaks corresponding to Au250/1- and Au25+1/0. The electrochemical sensor showed dramatic enhancements in the anodic and cathodic peak currents upon the addition of glucose. The electron transfer dynamics in the modified electrode was investigated as a function of Au25, which manifests the dual role of Au25 as redox mediators as well as electronic conductors controlling the sensing sensitivity. In addition, the fact that redox peak currents were increased as the addition of GOx suggests the Au25 molten salt acts as an excellent support for the enzymatic reaction.

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