Scanning electrochemical microscopy. 19. Ion-selective potentiometric microscopy

Benjamin R. Horrocks, Michael V. Mirkin, David T. Pierce, Allen J. Bard, G. Nagy, K. Tóth

Research output: Contribution to journalArticle

187 Citations (Scopus)

Abstract

Potentiometric pH selective tips for scanning electrochemical microscopy (SECM) have been developed and used to image local pH changes in a variety of model chemical systems. Images of pH profiles around a platinum microelectrode during water reduction, a corroding disk of silver iodide in aqueous potassium cyanide, a disk of immobilized urease hydrolyzing urea, and a disk of immobilized yeast cells in glucose solution were obtained. A simple method for fabricating antimony microdisk electrodes suitable for use in SECM is described. The general theory for SECM with potentiometric ion selective tips is also presented, assuming that the tip is a purely passive sensor. Reasonable agreement with theory was observed for relatively large tip to surface separations. The deviations observed at small separations were due to shielding of the surface by the tip and, consequently, were found to be much less significant for smaller tips.

Original languageEnglish
Pages (from-to)1213-1224
Number of pages12
JournalAnalytical Chemistry
Volume65
Issue number9
Publication statusPublished - May 1 1993

Fingerprint

Microscopic examination
Ions
Scanning
Potassium Cyanide
Antimony
Urease
Microelectrodes
Platinum
Shielding
Yeast
Urea
Cells
Glucose
Electrodes
Water
Sensors
silver iodide

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Horrocks, B. R., Mirkin, M. V., Pierce, D. T., Bard, A. J., Nagy, G., & Tóth, K. (1993). Scanning electrochemical microscopy. 19. Ion-selective potentiometric microscopy. Analytical Chemistry, 65(9), 1213-1224.

Scanning electrochemical microscopy. 19. Ion-selective potentiometric microscopy. / Horrocks, Benjamin R.; Mirkin, Michael V.; Pierce, David T.; Bard, Allen J.; Nagy, G.; Tóth, K.

In: Analytical Chemistry, Vol. 65, No. 9, 01.05.1993, p. 1213-1224.

Research output: Contribution to journalArticle

Horrocks, BR, Mirkin, MV, Pierce, DT, Bard, AJ, Nagy, G & Tóth, K 1993, 'Scanning electrochemical microscopy. 19. Ion-selective potentiometric microscopy', Analytical Chemistry, vol. 65, no. 9, pp. 1213-1224.
Horrocks, Benjamin R. ; Mirkin, Michael V. ; Pierce, David T. ; Bard, Allen J. ; Nagy, G. ; Tóth, K. / Scanning electrochemical microscopy. 19. Ion-selective potentiometric microscopy. In: Analytical Chemistry. 1993 ; Vol. 65, No. 9. pp. 1213-1224.
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