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    A Glucose Sensor Based on an Organic Electrochemical Transistor Structure Using a Vapor Polymerized Poly(3,4-ethylenedioxythiophene) Layer

    Year: 2010

    Journal: Japanese Journal of Applied Physics 49 (2010), 20111221

    Authors: Yuna Kim, Jaekwon Do, Jeonghun Kim, Sang Yoon Yang1, George G. Malliaras1, Christopher K. Ober1, and Eunkyoung Kim

    Organizations: Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea, 1Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, U.S.A.

    A glucose sensor based on an organic electrochemical transistor (OECT) structure was prepared by vapor phase polymerization (VPP) of 3,4-
    ethylenedioxythiophene (EDOT). The poly(3,4-ethylenedioxythiophene) (PEDOT) film was introduced as the conducting polymer channel and a
    platinum wire was used as a gate electrode in the OECT. The redox enzyme glucose oxidase (GOx) was introduced into the electrolyte of the
    OECT. The sensitivity and detection range of the sensor could be tuned by adjusting the source–drain and gate bias. The OECT showed high
    sensitivity to glucose in the low concentration region below 10 mM. An acid sensitive fluorescent layer was easily coated on top of the vapor
    polymerized PEDOT to obtain a double-layered OECT sensor. The optical sensitivity of the double-layered OECT sensor correlated linearly with
    the electrochemical sensitivity. Furthermore, the fluorescence intensity change of the double-layered OECT sensor was linearly dependent on pH,
    providing the OECT sensor with dual sensitivity of electrochemical and optical sensitivity.