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Scanning Bipolar Electrochemical Microscopy
journal contribution
posted on 2018-04-23, 00:00 authored by Vera Eßmann, Carla Santana Santos, Tsvetan Tarnev, Mauro Bertotti, Wolfgang SchuhmannElectrochemical
techniques offer high temporal resolution for studying
the dynamics of electroactive species at samples of interest. To monitor
fastest concentration changes, a micro- or nanoelectrode is accurately
positioned in the vicinity of a sample surface. Using a microelectrode
array, it is even possible to investigate several sites simultaneously
and to obtain an instantaneous image of local dynamics. However, the
spatial resolution is limited by the minimal electrode size required
in order to contact the electrodes. To provide a remedy, we introduce
the concept of scanning bipolar electrochemical microscopy and the
corresponding experimental system. This technique allows precise positioning
of a wireless scanning bipolar electrode to convert spatially heterogeneous
concentrations of the analyte of interest into an electrochemiluminescence
map of the sample reactivity. After elucidating the working principle
by recording bipolar line and array scans, a bipolar electrode array
is positioned at the site of interest to record an electrochemical
image of the localized release of analyte molecules.
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recording bipolar linearray scanssample surfacemicroelectrode arrayscanning bipolar electrodedynamicsiteconcentration changeselectrochemiluminescence mapScanning Bipolar Electrochemical Microscopy Electrochemical techniques offeranalyte moleculeselectrochemical imagebipolar electrode arrayscanning bipolar electrochemical microscopysample reactivityelectroactive specieselectrode size
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