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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Adsorption of catechol onto PEDOT films doped with gold nanoparticles: Electrochemical and spectroscopic studies

Texto completo
Autor(es):
Soares, Ana Leticia [1] ; Zamora, Martin L. [2] ; Marchesi, Luis F. [1, 3] ; Vidotti, Marcio [1]
Número total de Autores: 4
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
Número total de Afiliações: 3
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:Lauro Tatsuo Kubota
Linha de fomento: Auxílio à Pesquisa - Temático