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Type: Artigo
Title: Synthesis and characterization of alpha-nickel (II) hydroxide particles on organic-inorganic matrix and its application in a sensitive electrochemical sensor for vitamin D determination
Author: Canevari, T. C.
Cincotto, F. H.
Landers, R.
Machado, S. A. S.
Abstract: This paper describes the synthesis, characterization and application of amorphous nickel (II) hydroxide particles, alpha-Ni(OH)(2), onto a hybrid material composed of silica and graphene oxide, SiO2/GO. The sol-gel process using HF as the catalyst was used to obtain this organic-inorganic matrix. The Ni(OH)(2) were prepared directly on the surface of the matrix using nickel (II) acetate and N, N-dimethylformamide (DMF) as a solvent. The SiO2/GO/Ni(OH)(2) material was characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), energy-dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. A glassy carbon electrode modified with the SiO2/GO/Ni(OH)(2) material was used in the development of a sensitive electrochemical sensor for the determination of vitamin D-3 by pulse differential voltammetry. A well-defined electro-oxidation peak of vitamin D-3 was observed in sodium hydroxide at pH 13. The results indicated that the resultant SiO2/GO/Ni(OH)(2) modified electrode is highly selective and very sensitive with a limit of detection, in pure laboratory solutions of 3.26 x 10(-9) mol dm(-3); therefore, it can be used to detect vitamin D3 in real samples.
Subject: Sensores eletroquímicos
Óxido de grafeno
Hidróxido de níquel
Vitamina D
Electrochemical sensors
Graphene oxide
Nickel hydroxide
Vitamin D
Country: Reino Unido
Editor: Pergamon Press
Rights: fechado
Identifier DOI: 10.1016/j.electacta.2014.10.012
Date Issue: 2014
Appears in Collections:IFGW - Artigos e Outros Documentos

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