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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Silva Junior, Gilberto J. [1] ; Guimaraes Selva, Jessica Soares [1] ; Sukeri, Anandhakumar [2] ; Goncalves, Josue M. [1] ; Regiart, Matias [1] ; Bertotti, Mauro [1]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 2
Document type: Journal article
Source: Talanta; v. 226, MAY 2021.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 19/14418-3 - Electrochemical sensors for water quality monitoring
Grantee:Gilberto Jose Silva Junior
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 18/16896-7 - Development of amperometric and impedimetric sensors based on double hydroxides of nickel and vanadium (alpha-NixV1-x(OH)2) and their nanocomposites with expandable graphite/graphene
Grantee:Josué Martins Gonçalves
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 18/08782-1 - Miniaturized and integrated chemical sensors: new fabrication platforms for biological, clinical and environmental applications
Grantee:Mauro Bertotti
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/06293-6 - Investigations in biological systems by using miniaturized electrochemical sensors
Grantee:Daniel Matias Gaston Regiart
Support Opportunities: Scholarships in Brazil - Post-Doctoral