Suppressing electrostatic screening in nanostructured electrode arrays

Zuankai Wang, Nikhil Koratkar

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

An individual nanostructure provides very high electric field enhancement because the sharp curvature of the nanostructure tip amplifies the local electric field near the apex tip. However any practical nanostructured electrode is comprised of an ensemble (array) of nanostructures. In such systems, mutual electrostatic shielding (or screening) severely limits the maximum achievable electric field enhancement. In this paper, we discuss three approaches for suppression of shielding. These include-(1) reducing anode-to-cathode distance to less than the nanostructure-to-nanostructure spacing, (2) increasing length of selected individual nanostructures within the array, and (3) design of electrodes with multistage amplification. We show that these approaches are effective in alleviating electrostatic shielding and that the enhancement factor of the electrode array (ensemble) can be engineered to match that of the individual (isolated) nanostructure.

Original languageEnglish
Pages (from-to)1979-1984
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume6
Issue number7
DOIs
Publication statusPublished - Jul 2006
Externally publishedYes

Keywords

  • Electric Field Amplification
  • Electrostatic Screening
  • Field Emission
  • Field Ionization
  • Nanostructured Electrodes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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