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research article

Microfluidic Push-Pull Probe for Scanning Electrochemical Microscopy

Momotenko, Dmitry  
•
Cortes-Salazar, Fernando  
•
Lesch, Andreas  
Show more
2011
Analytical Chemistry

This paper presents a microfluidic push-pull probe for scanning electrochemical microscopy (SECM) consisting of a working microelectrode, an integrated counter/reference electrode and two microchannels for pushing and pulling an electrolyte solution to and away from a substrate. With such a configuration, a droplet of a permanently renewed redox mediator solution is maintained just at the probe tip to carry out SECM measurements on initially dry substrates or in microenvironments. For SECM imaging purposes, the probe fabricated in a soft polymer material is used in a contact regime. SECM images of various gold-on-glass samples demonstrate the proof-of-concept of a push-pull probe for local surface activity characterization with high spatial resolution even on vertically oriented substrates. Finite element computations were performed to guide the improvement of the probe sensitivity.

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Type
research article
DOI
10.1021/ac2006729
Web of Science ID

WOS:000292280900036

Author(s)
Momotenko, Dmitry  
Cortes-Salazar, Fernando  
Lesch, Andreas  
Wittstock, Gunther
Girault, Hubert H.  
Date Issued

2011

Published in
Analytical Chemistry
Volume

83

Issue

13

Start page

5275

End page

5282

Subjects

Electron-Transfer Kinetics

•

Atomic-Force Microscopy

•

Constant-Distance Mode

•

Microelectrode Probe

•

Subnanoliter Volumes

•

Air/Water Interface

•

Positioning Mode

•

Droplet Cell

•

Shear-Force

•

Oxide-Films

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LEPA  
Available on Infoscience
December 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/73893
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