Fabrication of dendritic nanoporous gold via a two-step amperometric approach: Application for electrochemical detection of methyl parathion in river water samples

Autor(es)

Silva Junior, Gilberto J. ^[1] ; Guimaraes Selva, Jessica Soares ^[1] ; Sukeri, Anandhakumar ^[2] ; Goncalves, Josue M. ^[1] ; Regiart, Matias ^[1] ; Bertotti, Mauro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Fundamental Chem, Inst Chem, Av Prof Lineu Prestes 748, BR-05513970 Sao Paulo, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Phys, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Talanta; v. 226, MAY 2021.
• Citações Web of Science: 0

Resumo

In this work, nanoporous gold (NPG) was prepared according to three different approaches, such as (i) anodization-electrochemical reduction (A-ECR, NPG(A)), (ii) dynamic hydrogen bubble template (DHBT, NPG(B)), and (iii) the combination of both methods (NPG(A+B)). Field-emission scanning electron microscopy (FE-SEM) and cyclic voltammetry (CV) were used to investigate the structural morphology and the electrochemical behavior of the fabricated materials. The NPG(A+B) electrode showed a large amount of surface defects and/or edges, greater electrochemical surface area (2.5 cm(2)), and increased roughness factor (35.4). Such outstanding features of the NPG(A+B) platform were demonstrated by the sensitive detection of methyl parathion (MP) in river water samples. CV results indicated nearly 25-fold, 6-fold, and 2.5-fold higher sensitivity for NPG(A+B) compared to that of bare Au, NPG(A), and NPG(B), respectively. Differential pulse voltammetry (DPV) results show a linear behavior in the MP concentration range of 5-50 ng mL(-1) with a limit of detection (LOD) of 0.6 ng mL(-1) and limit of quantification (LOQ) of 2.0 ng mL(-1). Besides, the NPG(A+B) sensor also revealed excellent selectivity towards MP detection in the presence of other interfering molecules or ions, reproducibility, and repeatability. (AU)

• Processo FAPESP: 19/14418-3 - Sensores eletroquímicos para o monitoramento da qualidade de águas
• Beneficiário: Gilberto Jose Silva Junior
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 18/16896-7 - Desenvolvimento de sensores amperométricos e impedimétricos baseados em hidróxidos duplos de níquel e Vanádio (alfa-NixV1-x(OH)2) e seus nanocompósitos com grafite expansível/grafenos
• Beneficiário: Josué Martins Gonçalves
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 18/08782-1 - Sensores químicos miniaturizados e integrados: novas plataformas de fabricação para aplicações biológicas, clínicas e ambientais
• Beneficiário: Mauro Bertotti
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/06293-6 - Investigações em sistemas biológicos empregando sensores eletroquímicos miniaturizados
• Beneficiário: Daniel Matias Gaston Regiart
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado