Space and frequency dependence of nanocapacitor array sensors response to microparticles in electrolyte

Andrea Cossettini*, Cecilia Laborde, Denis Brandalise, Frans Widdershoven, Serge G. Lemay, Luca Selmi

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
49 Downloads (Pure)


We present new experimental evidence and extensive numerical simulations of a few distinct fingerprints generated by dielectric and conductive microparticles in electrolyte environment on the capacitance spectra of nanoelectrode array sensors. Finite element simulations in good agreement with measurements allow us to identify unambiguously the physical origin of these features, and to illustrate their dependence on the system's geometrical and physical properties. In particular, we show that conductive particles induce a response with complex space and frequency dependencies, caused by the formation of an AC electrical double layer at the particle surface, and its interaction with the working and counter electrodes in the array. Furthermore, we highlight features that could lead to false-negative detection events in sensing applications. The theoretical predictions are confirmed by experiments on a state of the art CMOS pixelated nanocapacitor biosensor platform.

Original languageEnglish
Article number9234466
Pages (from-to)4696-4704
Number of pages9
JournalIEEE sensors journal
Issue number4
Publication statusPublished - 15 Feb 2021


  • capacitance spectroscopy
  • electrical double layer
  • Nanocapacitor arrays


Dive into the research topics of 'Space and frequency dependence of nanocapacitor array sensors response to microparticles in electrolyte'. Together they form a unique fingerprint.

Cite this