Mesoscopic concentration fluctuations in a fluidic nanocavity detected by redox cycling

Marcel A.G. Zevenbergen, Diego Krapf, Marc R. Zuiddam, Serge G. Lemay*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

86 Citations (Scopus)

Abstract

We show that a nanofluidic device consisting of a solution-filled cavity bounded by two closely spaced parallel electrodes can amplify the electrical current from redox molecules inside the cavity by a factor of ∼400 through redox cycling. The noise spectral density of this signal agrees quantitatively with the calculated fluctuations in the number of molecules inside the cavity due to their diffusive motion. We demonstrate sensitivity to fluctuations of as few as ∼70 molecules.

Original languageEnglish
Pages (from-to)384-388
Number of pages5
JournalNano letters
Volume7
Issue number2
DOIs
Publication statusPublished - Feb 2007
Externally publishedYes

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