CONTAMINATION OF GOLD ELECTRODES BY SALINE SOLUTIONS: EVALUATION OF CLEANING METHODS BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY

Vanderlei Souza; Matheus Mariano Nunes; Maria Luisa Sartorelli

Título do Trabalho

Autores

Vanderlei Souza
Matheus Mariano Nunes
Maria Luisa Sartorelli

Modalidade

Pôster - resumo

Área temática

Dispositivos eletrônicos, eletroquímicos, supercapacitores e baterias

Data de Publicação

27/05/2026

País da Publicação

Brasil

Idioma da Publicação

pt-BR

Página do Trabalho

https://www.even3.com.br/anais/workshop-do-ineo-2026/1465087-contamination-of-gold-electrodes-by-saline-solutions--evaluation-of-cleaning-methods-by-electrochemical-impedanc

ISBN

978-65-272-2467-9

Palavras-Chave

Electrochemical impedance spectroscopy, Generalized Phase Element, Interdigitated electrodes, conductivity cell

Resumo

The LabSiN group of the Physics Department at UFSC has developed a differential impedimetric analysis (GPE analysis) that extracts capacitance and resistance values without frequency dispersion and without the need to interpret the data using pre-conceived models [1]. The GPE method opens up a range of opportunities in the areas of health and environmental monitoring, as it enables the rapid interpretation of data obtained by impedimetric and conductimetric sensors. In this context, the use of gold in the manufacture of the sensor element is widespread due to its inert nature and ease of functionalization. However, we have found that interdigitated gold electrodes occasionally exhibit anomalous impedimetric behavior, which could be associated with the existence of a thin semiconductor film on the gold tracks. The formation of this film generally occurs after immersion of the electrode in saline solutions. However, some virgin electrodes also exhibit the same anomalous behavior. In this work, we sought to evaluate different cleaning methods (chemical, electrochemical, and mechanical) through the impedimetric characterization of a cylindrical gold electrode. Its cylindrical geometry minimizes edge effects, which ensures a narrow distribution of relaxation times. The solid nature of the electrode allows various cleaning methods to be tested, including heat treatment and mechanical polishing. The results show that exposing the electrode to chlorine-based saline electrolytes leads to an increase in the relaxation time distribution and a drastic drop in the double-layer capacitance. Chemical and electrochemical cleaning procedures did not produce the expected results [2]. Recovery of the metallic state of the surface was only achieved after mechanical polishing of the electrode using alumina solutions. Acknowledgements: This work was financially supported by INEO, through the FAPESP (2025/27044-5) and CNPq (408449/2024-1) projects, and by FAPESC, through project 2025TR001619. References: [1] M.L. Sartorelli et al., Electrochim. Acta 390 (2021) 138796 [2] L. M. Fischer et al., Microelectronic Eng. 86 (2009) 1282

Título do Evento: Workshop do INEO 2026
Cidade do Evento: Nazaré Paulista
Título dos Anais do Evento: Anais do Workshop do INEO 2026
Nome da Editora: Even3
Meio de Divulgação: Meio Digital

Como citar

SOUZA, Vanderlei; NUNES, Matheus Mariano; SARTORELLI, Maria Luisa. CONTAMINATION OF GOLD ELECTRODES BY SALINE SOLUTIONS: EVALUATION OF CLEANING METHODS BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY.. In: Anais do Workshop do INEO 2026. Anais...Nazaré Paulista(SP) Hotel Estância Atibainha, 2026. Disponível em: https//www.even3.com.br/anais/workshop-do-ineo-2026/1465087-CONTAMINATION-OF-GOLD-ELECTRODES-BY-SALINE-SOLUTIONS--EVALUATION-OF-CLEANING-METHODS-BY-ELECTROCHEMICAL-IMPEDANC. Acesso em: 11/08/2026