Mass transport in electrochemical nanogap sensors

Klaus Mathwig, Serge Joseph Guy Lemay

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17 Citations (Scopus)

Abstract

Nanofluidic thin-layer cells based on redox cycling allow for extremely sensitive electrochemical detection. Here we establish a physical mass-transfer model for analyte molecules in these transducers which takes into account advective and diffusive transport of both oxidized and reduced species as well as reversible dynamic adsorption at the sensor surfaces. We use finite-element modeling to determine the transient response of nanogap sensors; numerically we predict that the response time can be reduced substantially by pressure-driven advection while the faradaic limiting current remains unaffected by this flow for all experimentally accessible flow rates
Original languageEnglish
Pages (from-to)943-949
JournalElectrochimica acta
Volume112
DOIs
Publication statusPublished - 2013

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Keywords

  • IR-90037
  • METIS-298699

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