Transient electrical behavior of an electrode/electrolyte interface based on a surface micro-structured with gold mushroom shapes

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Reis, JA (Author) Other; Medeiros, MCR (Author) Other; Inacio, PM (Author) Other; Cerquido, M (Author) Other; ventura, j. (Author) FCUP; Gomes, HL (Author) Other

Journal

Title: Journal of Applied Physics

Vol. 124

ISSN: 0021-8979

Publisher: American Institute of Physics

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-00P-YRW

DOI: 10.1063/1.5042712

Abstract (EN): The transient electrical behavior of an electrode/electrolyte interface based on an electrode micro-structured with gold protruding mushroom shapes is measured and modeled. The application of a voltage pulse train with changing frequency generates a corresponding train of current pulses with an offset current that approaches a saturation limit exponentially. The transient behavior of the electrical current was accurately reproduced using the Nernst-Planck-Poisson model and the geometric parameters of the mushroom shape. Spatiotemporal patterns of the electric field demonstrate that the current transient is caused by a slow kinetics of charges accumulating at the gold/electrolyte interface and under the micro-mushroom cap. The accumulation of charges establishes an internal electrical potential that drives a Faradic current through the mushroom/electrolyte interface. The aim of this work is to understand how this charge dynamics in the vicinity of the three-dimensional electrode surfaces is established and how it can be minimized to prevent damage to cells and tissues under electrical stimulation. Published by AIP Publishing.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7