Electrochemical Amplification in Side-by-Side Attoliter Nanogap Transducers

Hamid Reza Zafarani, Klaus Mathwig*, Ernst J.R. Sudhölter, Liza Rassaei

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    8 Citations (Scopus)
    59 Downloads (Pure)

    Abstract

    We report a strategy for the fabrication of a new type of electrochemical nanogap transducer. These nanogap devices are based on signal amplification by redox cycling. Using two steps of electron-beam lithography, vertical gold electrodes are fabricated side by side at a 70 nm distance encompassing a 20 attoliter open nanogap volume. We demonstrate a current amplification factor of 2.5 as well as the possibility to detect the signal of only 60 analyte molecules occupying the detection volume. Experimental voltammetry results are compared to calculations from finite element analysis.

    Original languageEnglish
    Pages (from-to)724-728
    Number of pages5
    JournalACS Sensors
    Volume2
    Issue number6
    DOIs
    Publication statusPublished - 23 Jun 2017

    Keywords

    • electrochemical sensor
    • generator-collector electrodes
    • nanofabrication
    • nanofluidics
    • nanogap sensor
    • redox cycling

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