Dense Array of Nanoparticles as a Large-Area Nanoelectrode for Sensors: An Oxymoron Mesomaterial?

Seung Woo Lee, Eun Hee Lee, Ravi F. Saraf

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Compared to redox reactions at large electrodes, those at nanoscale electrodes are controlled by kinetics rather than diffusion, thus resulting in responses that are orders of magnitude faster at higher sensitivity. To avoid interference by diffusion-flux domains of adjacent particles, for monolayers of nanoparticles as individual electrodes, the area coverage should be below approximately 10%, which is well below the percolation threshold of 45%. Conducting monolayer arrays consisting of a network of one-dimensional necklaces of 10nm Au particles with 54 to 26% area coverage are shown to behave like ultramicroelectrodes and nanoelectrode ensembles (NEEs). The reconciliation of the two opposing requirements of high and low coverage for percolation and NEE behavior, respectively, is attributed to the necklace-network topology.

Original languageEnglish (US)
Pages (from-to)1281-1286
Number of pages6
JournalChemElectroChem
Volume1
Issue number8
DOIs
StatePublished - Aug 12 2014

Keywords

  • Conducting array
  • Gold
  • Nanoparticles
  • Soft lithography
  • Ultramicroelectrode

ASJC Scopus subject areas

  • Catalysis
  • Electrochemistry

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