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Suppressing Electrostatic Screening in Nanostructured Electrode Arrays

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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.
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Document Type: Research Article

Publication date: 2006-07-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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