Simultaneous noncontact topography and electrochemical imaging by SECM/SICM featuring ion current feedback regulation

Yasufumi Takahashi, Andrew I. Shevchuk, Pavel Novak, Yumi Murakami, Hitoshi Shiku, Yuri E. Korchev, Tomokazu Matsue

Research output: Contribution to journalArticle

205 Citations (Scopus)

Abstract

We described a hybrid system of scanning electrochemical microscopy (SECM) and scanning ion conductance microscopy (SICM) with ion current feedback nanopositioning control for simultaneous imaging of noncontact topography and spatial distribution of electrochemical species. A nanopipette/nanoring electrode probe provided submicrometer resolution of the electrochemical measurement on surfaces with complex topology. The SECM/SICM probe had an aperture radius of 220 nm. The inner and outer radii of the SECM Au nanoring electrode were 330 and 550 nm, respectively. Characterization of the probe was performed with scanning electron microscopy (SEM), cyclic voltammetry (CV), and approach curve measurements. SECM/SICM was applied to simultaneous imaging of topography and electrochemical responses of enzymes (horse radish peroxidase (HRP) and glucose oxidase (GOD)) and single live cells (A6 cells, superior cervical ganglion (SCG) cells, and cardiac myocytes). The measurements revealed the distribution of activity of the enzyme spots on uneven surfaces with submicrometer resolution. SECM/SICM acquired high resolution topographic images of cells together with the map of electrochemical signals. This combined technique was also applied to the evaluation of the permeation property of electroactive species through cellular membranes.

Original languageEnglish
Pages (from-to)10118-10126
Number of pages9
JournalJournal of the American Chemical Society
Volume132
Issue number29
DOIs
Publication statusPublished - 2010 Jul 28

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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