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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

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

Revista

Título: Journal of Applied Physics

Vol. 124

ISSN: 0021-8979

Editora: American Institute of Physics

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 1 Citação

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7