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

Autor(es)

Canevari, Thiago C. ^[1] ; Cincotto, Fernando H. ^[1] ; Landers, Richard ^[2] ; Machado, Sergio A. S. ^[1]

Afiliação do(s) autor(es)

^[1] State Univ Sao Paulo, Inst Chem, BR-13560970 Sao Carlos, SP - Brazil

^[2] Univ Estadual Campinas, Gleb Wataghin Inst Phys, Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 147, p. 688-695, NOV 20 2014.
• Citações Web of Science: 10

Resumo

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. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/18339-1 - Detecção dos interferentes endócrinos testosterona e estradiol em amostras ambientais empregando eletrodos modificados com grafeno, nanopartículas de ouro e quantum dots.
• Beneficiário: Fernando Henrique Cincotto
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/23047-7 - Desenvolvimento de biosensor eletroquímico utilizando sílica mesoporosa contendo nanotubos de carbono obtida pelo processo sol-gel. Determinação eletroquímica de pesticidas
• Beneficiário: Thiago da Cruz Canevari
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado