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Hopping intermittent contact-scanning electrochemical microscopy (HIC-SECM) : visualizing interfacial reactions and fluxes from surfaces to bulk solution
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Lazenby, Robert A., McKelvey, Kim M. (Kim Martin) and Unwin, Patrick R. (2013) Hopping intermittent contact-scanning electrochemical microscopy (HIC-SECM) : visualizing interfacial reactions and fluxes from surfaces to bulk solution. Analytical Chemistry, Volume 85 (Number 5). pp. 2937-2944. doi:10.1021/ac303642p ISSN 0003-2700.
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Official URL: http://dx.doi.org/10.1021/ac303642p
Abstract
Hopping intermittent contact-scanning electrochemical microscopy (HIC-SECM) is introduced as a powerful new technique for the quantitative visualization of redox activity and concentration at and above a surface of interest. HIC-SECM combines a hopping imaging mode, in which data are acquired at a tip as a function of distance (z) from the surface, at a series of x, y pixels across the surface, using the principles of intermittent contact to provide a nonelectrochemical means of determining when the tip and the substrate come into contact. The implementation of HIC-SECM is described, and SECM feedback measurements in three-dimensional (3D) space over a gold band array are presented. To demonstrate the generality of the methodology, flux imaging is also carried out over a Pt-disk ultramicroelectrode (UME) in the feedback mode and substrate generation/tip collection mode. The type of information that can be extracted from the data sets acquired include x-y current maps at a well-defined tip–substrate separation (parallel to the surface), x-z current maps (normal to the surface), 3D x-y-z profiles, approach curves at particular spots on the surface of interest, and surface topography. Moreover, because HIC-SECM utilizes an oscillating probe, alternating current data are also obtained that greatly enhances the information content compared to other types of electrochemical imaging. Furthermore, interfacial fluxes are ubiquitous in chemistry and allied areas, and HIC-SECM opens up the possibility of detailed flux visualization in three dimensions for many physicochemical processes.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Journal or Publication Title: | Analytical Chemistry | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0003-2700 | ||||
Official Date: | 4 February 2013 | ||||
Dates: |
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Volume: | Volume 85 | ||||
Number: | Number 5 | ||||
Page Range: | pp. 2937-2944 | ||||
DOI: | 10.1021/ac303642p | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC), MOAC/DTC, Advantage West Midlands, European Regional Development Fund | ||||
Grant number: | Grant EP/H023909/1 (EPSRC) |
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