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Updated: Aug 14, 2026

Probing Surface Electrochemical Activity of Nanomaterials using a Hybrid Atomic Force Microscope-Scanning Electrochemical Microscope (AFM-SECM)
Published on: February 10, 2021
Scanning electrochemical microscopy. Hydrodynamics generated by the motion of a scanning tip and its consequences on
Catherine Combellas1, Marc Fermigier, Adrien Fuchs
1Laboratoire Environnement et Chimie Analytique, UMR 7121, ESPCI, 10 rue Vauquelin, 75231 Paris Cedex 05, France. Catherine.Combellas@espci.fr
Abstract:
The motion of a SECM tip above a substrate generates a flow of the surrounding fluid. Finite element calculations show that this flow is a simple linear-shear flow (Couette flow) for small tip-substrate separations and deviates from Couette's law at larger ones. The effect of fluid flow on the tip current response was determined numerically. Different mass-transfer regimes are observed depending on the insulating or conducting nature of the substrate, the tip speed (or fluid velocity), and the tip-substrate separation. Those observations are tested experimentally, and good agreement is obtained between numerical and experimental results.
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