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

Celeste A. Morris, Chiao Chen Chen, Lane A. Baker

Research output: Contribution to journalArticle

51 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)2933-2938
Number of pages6
JournalAnalyst
Volume137
Issue number13
DOIs
Publication statusPublished - 2012 Jul 7

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

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