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Fabrication and characterization of dual function nanoscale pH-scanning ion conductance microscopy (SICM) probes for high resolution pH mapping
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Paulose Nadappuram, Binoy, McKelvey, Kim M. (Kim Martin), Al Botros, Rehab, Colburn, Alex W. and Unwin, Patrick R. (2013) Fabrication and characterization of dual function nanoscale pH-scanning ion conductance microscopy (SICM) probes for high resolution pH mapping. Analytical Chemistry, Volume 85 (Number 17). pp. 8070-8074. doi:10.1021/ac401883n ISSN 0003-2700.
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WRAP_Unwin_1050272-ch-141013-fabrication_of_dual_function_nanoscale_ph-scanning.pdf - Accepted Version Download (925Kb) | Preview |
Official URL: http://dx.doi.org/10.1021/ac401883n
Abstract
The easy fabrication and use of nanoscale dual function pH-scanning ion conductance microscopy (SICM) probes is reported. These probes incorporate an iridium oxide coated carbon electrode for pH measurement and an SICM barrel for distance control, enabling simultaneous pH and topography mapping. These pH-SICM probes were fabricated rapidly from laser pulled theta quartz pipets, with the pH electrode prepared by in situ carbon filling of one of the barrels by the pyrolytic decomposition of butane, followed by electrodeposition of a thin layer of hydrous iridium oxide. The other barrel was filled with an electrolyte solution and Ag/AgCl electrode as part of a conductance cell for SICM. The fabricated probes, with pH and SICM sensing elements typically on the 100 nm scale, were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and various electrochemical measurements. They showed a linear super-Nernstian pH response over a range of pH (pH 2–10). The capability of the pH-SICM probe was demonstrated by detecting both pH and topographical changes during the dissolution of a calcite microcrystal in aqueous solution. This system illustrates the quantitative nature of pH-SICM imaging, because the dissolution process changes the crystal height and interfacial pH (compared to bulk), and each is sensitive to the rate. Both measurements reveal similar dissolution rates, which are in agreement with previously reported literature values measured by classical bulk methods.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | High resolution electron microscopy , Electron microscopy, Hydrogen-ion concentration | ||||
Journal or Publication Title: | Analytical Chemistry | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0003-2700 | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 85 | ||||
Number: | Number 17 | ||||
Page Range: | pp. 8070-8074 | ||||
DOI: | 10.1021/ac401883n | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 25 December 2015 | ||||
Date of first compliant Open Access: | 25 December 2015 | ||||
Funder: | European Research Council (ERC), University of Warwick, Engineering and Physical Sciences Research Council (EPSRC) | ||||
Grant number: | ERC-2009-AdG247143-QUANTIF (ERC) |
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