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Characterization of nanopipettes

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Perry, David, Momotenko, Dmitry, Lazenby, Robert A., Kang, Minkyung and Unwin, Patrick R. (2016) Characterization of nanopipettes. Analytical Chemistry . doi:10.1021/acs.analchem.6b01095

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Official URL: http://dx.doi.org/10.1021/acs.analchem.6b01095

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Abstract

Nanopipettes are widely used in electrochemical and analytical techniques as tools for sizing, sequencing, sensing, delivery and imaging. For all of these applications, the response of a nanopipette is strongly affected by its geometry and surface chemistry. As the size of nanopipettes becomes smaller, precise geometric characterization is increasingly important, especially if nanopipette probes are to be used for quantitative studies and analysis. This contribution highlights the combination of data from voltage-scanning ion conductivity experiments, transmission electron microscopy (TEM) and finite element method (FEM) simulations to fully characterize nanopipette geometry and surface charge characteristics, with an accuracy not achievable using existing approaches. Indeed, it is shown that presently used methods for nanopipette characterization can lead to highly erroneous information on nanopipettes. The new approach to characterization further facilitates high-level quantification of the behavior of nanopipettes in electrochemical systems, as demonstrated herein for a scanning ion conductance microscope (SICM) setup.

Item Type: Journal Article
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Science > Chemistry
Faculty of Science > Molecular Organisation and Assembly in Cells (MOAC)
Library of Congress Subject Headings (LCSH): Nanotechnology -- Research, Electrochemical apparatus
Journal or Publication Title: Analytical Chemistry
Publisher: American Chemical Society
ISSN: 0003-2700
Official Date: 17 May 2016
Dates:
DateEvent
17 May 2016Published
25 April 2016Available
25 April 2016Accepted
25 March 2016Modified
19 March 2016Submitted
DOI: 10.1021/acs.analchem.6b01095
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: ACS
Funder: European Research Council (ERC), Engineering and Physical Sciences Research Council (EPSRC), Marie Curie Intra-European Fellowship (IEF)
Grant number: 2009 AdG 247143-QUANTIFEP (ERC), EP/F500378/1 (EPSRC) 626158 FUNICIS (IEF)

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