Autor(es)

Soares, Ana Leticia ^[1] ; Zamora, Martin L. ^[2] ; Marchesi, Luis F. ^{[1, 3]} ; Vidotti, Marcio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Parana, Grp Pesquisas Macromol & Interfaces GPMIn, CP 19032, BR-81531980 Curitiba, Parana - Brazil

^[2] Univ Nacl Tucuman, Lab Medios & Interfases LAMEIN, DBI, FACET, Av Independencia 1800, San Miguel De Tucuman - Argentina

^[3] Univ Tecnol Fed Parana, Av Monteiro Lobato S-N Km 04, BR-84016210 Ponta Grossa, PR - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 322, NOV 1 2019.
• Citações Web of Science: 0

Resumo

In this work, the electrochemical processes at the electrode/electrolyte interface of PEDOT:PSS modified electrodes were studied. A detailed investigation using Electrochemical Impedance Spectroscopy (EIS) was done to determine the adsorption and electrochemical effects caused by the interaction of catechol at the conductive substrate. Different parameters such as double-layer capacitance, charge transfer resistance and intercalation charge distribution were analyzed in the presence of different amounts of catechol in the electrolyte. It was found a direct response of the charge transfer resistance (R-ct) with catechol concentration, in the same way, the electrocatalytical response of the reversible redox reaction of catechol was observed. The investigation of the incorporation of gold nanoparticles (AuNPs) onto the PEDOT:PSS substrates showed an intrinsic increment in the conductivity, favoring the interaction between catechol and PEDOT, presenting an interesting tool for the construction of impedimetric sensors. The modified electrodes were further characterized by Scanning Electron Microscopy and Raman Spectroscopy. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 14/50867-3 - INCT 2014: Instituto Nacional de Ciência e Tecnologia de Bioanalítica
• Beneficiário: Marco Aurelio Zezzi Arruda
• Modalidade de apoio: Auxílio à Pesquisa - Temático