A simple method to fabricate electrochemical sensor systems with predictable high-redox amplification

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    Abstract

    In this paper an easy to fabricate SU8/glass-based microfluidic sensor is described with two closely spaced parallel electrodes for highly selective measurements using the redox cycling effect. By varying the length of the microfluidic entrance channel, a diffusion barrier is created for non-cycling species effectively increasing selectivity for redox cycling species. Using this sensor, a redox cycling amplification of similar to 6500x is measured using the ferrocyanide redox couple. Moreover, a simple, but accurate analytical expression is derived that predicts the amplification factor based on the sensor geometry.
    Original languageUndefined
    Pages (from-to)1548-1553
    Number of pages6
    JournalLab on a chip
    Volume12
    Issue number8
    DOIs
    Publication statusPublished - 2012

    Keywords

    • EWI-21916
    • METIS-286388
    • IR-80518

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