Noise characteristics of nanoscaled redox-cycling sensors: Investigations based on random walks

E. Kätelhön, E. Krause, Pradyumna Singh, Serge Joseph Guy Lemay, B. Wolfrum

    Research output: Contribution to journalArticleAcademicpeer-review

    26 Citations (Scopus)

    Abstract

    We investigate noise effects in nanoscaled electrochemical sensors using a three-dimensional simulation based on random walks. The presented approach allows the prediction of time-dependent signals and noise characteristics for redox cycling devices of arbitrary geometry. We demonstrate that the simulation results closely match experimental data as well as theoretical expectations with regard to measured currents and noise power spectra. We further analyze the impact of the sensor design on characteristics of the noise power spectrum. Specific transitions between independent noise sources in the frequency domain are indicative of the sensor-reservoir coupling and can be used to identify stationary design features or time-dependent blocking mechanisms. We disclose the source code of our simulation. Since our approach is highly flexible with regard to the implemented boundary conditions, it opens up the possibility for integrating a variety of surface-specific molecular reactions in arbitrary electrochemical systems. Thus, it may become a useful tool for the investigation of a wide range of noise effects in nanoelectrochemical sensors.
    Original languageEnglish
    Pages (from-to)8874-8881
    JournalJournal of the American Chemical Society
    Volume135
    Issue number24
    DOIs
    Publication statusPublished - 2013

    Keywords

    • IR-90030
    • METIS-298685

    Fingerprint Dive into the research topics of 'Noise characteristics of nanoscaled redox-cycling sensors: Investigations based on random walks'. Together they form a unique fingerprint.

  • Cite this