Nanocavity crossbar arrays for parallel electrochemical sensing on a chip

Enno Kätelhön, Dirk Mayer, Marko Banzet, Andreas Offenhäusser, Bernhard Wolfrum

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

We introduce a novel device for the mapping of redox-active compounds at high spatial resolution based on a crossbar electrode architecture. The sensor array is formed by two sets of 16 parallel band electrodes that are arranged perpendicular to each other on the wafer surface. At each intersection, the crossing bars are separated by a ca. 65 nm high nanocavity, which is stabilized by the surrounding passivation layer. During operation, perpendicular bar electrodes are biased to potentials above and below the redox potential of species under investigation, thus, enabling repeated subsequent reactions at the two electrodes. By this means, a redox cycling current is formed across the gap that can be measured externally. As the nanocavity devices feature a very high current amplification in redox cycling mode, individual sensing spots can be addressed in parallel, enabling high-throughput electrochemical imaging. This paper introduces the design of the device, discusses the fabrication process and demonstrates its capabilities in sequential and parallel data acquisition mode by using a hexacyanoferrate probe.

Original languageEnglish
Pages (from-to)1137-1143
Number of pages7
JournalBeilstein Journal of Nanotechnology
Volume5
Issue number1
DOIs
StatePublished - 2014
Externally publishedYes

Keywords

  • Electrochemical imaging
  • Nanoelectrochemistry
  • Redox cycling

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