Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.


Issue 13, 2009
Previous Article Next Article

Chemical and morphological changes on platinum microelectrode surfaces in AC and DC fields with biological buffer solutions

Author affiliations

Abstract

Platinum is widely considered a noncorrodible and inert microelectrode material for many electrokinetic microdevice applications. However, platinum reactions are well documented in the literature. Reproducibility of cellular electrokinetic microdevice responses were inconsistent and suggested a dependance on platinum microelectrode function with exposure time in electric fields. Chemical and morphological changes on the surface of platinum microelectrodes in 1 Vpp/175 µm and 6 Vpp/175 µm AC and ±3 V/175 µm DC electric fields in the presence of five biological buffer solutions were investigated. Platinum dissolution, platinum redeposition, chloride formation and oxide formation on platinum microelectrode surfaces were observed by scanning electron microscopy and energy dispersive spectroscopy under ordinary microdevice conditions and verified by cyclic voltammetry studies. X-ray photoelectron spectroscopy showed the presence of oxygen and oxidation of platinum on microelectrode surfaces. Changes were more severe in a 6 Vpp/175 µm AC field than in a 1 Vpp/175 µm AC field, and more severe in ±3 V/175 µm DC fields than in a 6 Vpp/175 µm AC field.

Graphical abstract: Chemical and morphological changes on platinum microelectrode surfaces in AC and DC fields with biological buffer solutions

Back to tab navigation

Article information


Submitted
12 Nov 2008
Accepted
12 Mar 2009
First published
26 Mar 2009

Lab Chip, 2009,9, 1866-1873
Article type
Paper

Chemical and morphological changes on platinum microelectrode surfaces in AC and DC fields with biological buffer solutions

A. Gencoglu and A. Minerick, Lab Chip, 2009, 9, 1866
DOI: 10.1039/B820126A

Social activity

Search articles by author

Spotlight

Advertisements