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Issue 13, 2012
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Transport of redox probes through single pores measured by scanning electrochemical-scanning ion conductance microscopy (SECM-SICM)

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Abstract

We report scanning electrochemical microscopy-scanning ion conductance microscopy (SECM-SICM) experiments that describe transport of redox active molecules which emanate from single pores of a track-etch membrane. Experiments are performed with electrodes which consist of a thin gold layer deposited on one side of a nanopipet. Subsequent insulation of the electrode with parylene results in a hybrid electrode for SECM-SICM measurements. Electrode fabrication is straightforward and highly parallel. For image collection, ionic current measured at the nanopipet both controls the position of the electrode with respect to the membrane surface and reports the local conductance in the vicinity of the nanopipet, while faradaic current measured at the Au electrode reports the presence of redox-active molecules. Application of a transmembrane potential difference affords additional control over migration of charged species across the membrane.

Graphical abstract: Transport of redox probes through single pores measured by scanning electrochemical-scanning ion conductance microscopy (SECM-SICM)

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Publication details

The article was received on 30 Nov 2011, accepted on 16 Jan 2012 and first published on 26 Jan 2012


Article type: Paper
DOI: 10.1039/C2AN16178H
Citation: Analyst, 2012,137, 2933-2938
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    Transport of redox probes through single pores measured by scanning electrochemical-scanning ion conductance microscopy (SECM-SICM)

    C. A. Morris, C. Chen and L. A. Baker, Analyst, 2012, 137, 2933
    DOI: 10.1039/C2AN16178H

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