Combined scanning electrochemical/optical microscopy with shear force and current feedback

Youngmi Lee, Zhifeng Ding, Allen J. Bard

Research output: Contribution to journalArticlepeer-review

110 Scopus citations

Abstract

A technique that combines scanning electrochemical microscopy (SECM) and scanning optical microscopy (OM) was developed. Simultaneous scanning electrochemical/optical microscopy (SECM/OM) was performed by a special probe tip, which consists of an optical fiber core for light passage, surrounded by a gold ring electrode, and an outermost electrophoretic insulating sheath, with the tip attached to a tuning fork. To regulate the tip-substrate distance, either the shear force or the SECM tip current was employed as the feedback signal. The application of a quartz crystal tuning fork (32.768 kHz) for sensing shear force allowed simultaneous topographic, along with SECM and optical imaging in a constant-force mode. The capability of this technique was confirmed by obtaining simultaneously, for the first time, topographic, electrochemical, and optical images of an interdigitated array electrode. Current feedback from SECM also provided simultaneous electrochemical and optical images of relatively soft samples, such as a polycarbonate membrane filter and living diatoms in a constant-current mode. This mode should be useful in mapping the biochemical activity of a living cell.

Original languageEnglish
Pages (from-to)3634-3643
Number of pages10
JournalAnalytical Chemistry
Volume74
Issue number15
DOIs
StatePublished - 1 Aug 2002

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