Gold nanoparticles anchored onto three-dimensional graphene: simultaneous voltammetric determination of dopamine and uric acid.
Mikrochim Acta
; 186(8): 573, 2019 07 24.
Article
em En
| MEDLINE
| ID: mdl-31342189
ABSTRACT
An electrochemical sensor is described for simultaneous voltammetric determination of dopamine (DA) and uric acid (UA). It is based on the use of a nanomaterial composed of gold nanoparticles and 3-dimensional graphene (Au NP@3D GR). The 3D GR was prepared by chemical vapor deposition using nickel nanoparticles as the template at a temperature of around 900 °C. The surface of 3D GR contains oxygen-functional groups after treatment with acid. Carboxylated Au NP were self-assembled and anchored onto the surface of 3D GR. The nanomaterial was placed on a ITO electrode. The few-layer graphene on the ITO glass has a porous structure and the distribution of Au NP is uniform. The electrode shows a high sensitivity and a low detection limit for DA and UA. Figures of merit include detection limits of 0.1 M for DA and of 0.1 µM for UA, and well separated peaks at potentials of 0.18 and 0.30 V (vs. Ag/AgCl), respectively, at pH 7.0. The electrode has good repeatability and stability. Graphical abstract Carboxylated gold nanoparticles were self-assembled and immobilized on 3-dimensional graphene by chemical vapor deposition for simultaneous determination of dopamine (DA) and uric acid (UA).
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ácido Úrico
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Dopamina
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Nanopartículas Metálicas
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Técnicas Eletroquímicas
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Grafite
Limite:
Animals
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Humans
Idioma:
En
Revista:
Mikrochim Acta
Ano de publicação:
2019
Tipo de documento:
Article