Fabrication and characterization of probes for combined scanning electrochemical/optical microscopy experiments

Youngmi Lee, Allen J. Bard

Research output: Contribution to journalArticlepeer-review

70 Scopus citations

Abstract

A technique that combines scanning electrochemical microscopy (SECM) and optical microscopy (OM) was implemented with a new probe tip. The tip for scanning electrochemical/optical microscopy (SECM/OM) was constructed by insulating a typical gold-coated near-field scanning optical microscopy tip using electrophoretic anodic paint. Once fabricated, the tip was characterized by steady-state cyclic voltammetry, as well as optical and electrochemical approach experiments. This tip generated a stable steady-state current and well-defined SECM approach curves for both conductive and insulating substrates. Durable tips whose geometry was a ring with <1 μm as outer ring radius could be consistently fabricated. Simultaneous electrochemical and optical images of an interdigitated array electrode were obtained with a resolution on the micrometer scale, demonstrating good performance of the tip as both an optical and an electrochemical probe for imaging microstructures. The SECM feedback current measurements were successfully employed to determine tip-substrate distances for imaging.

Original languageEnglish
Pages (from-to)3626-3633
Number of pages8
JournalAnalytical Chemistry
Volume74
Issue number15
DOIs
StatePublished - 1 Aug 2002

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