Layer-by-layer composite film of nickel phthalocyanine and montmorillonite clay for synergistic effect on electrochemical detection of dopamine
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Data
2018-04-01
Autores
Lucena, Nathalia C. de
Miyazaki, Celina M.
Shimizu, Flavio M.
Constantino, Carlos J. L. [UNESP]
Ferreira, Marystela
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
Dopamine (DA) abnormal levels are related to diseases which makes important the development of fast, reliable, low-cost and sensitive devices for diagnosis and pharmaceutical controls. Nanostructured film composite of sodium montmorillonite clay (Na+MMT) and nickel phthalocyanine (NiTsPc) was selfassembled by layer-by-layer (LbL) technique and applied as electrochemical sensor for DA in the presence of common natural interferents as ascorbic acid (AA) and uric acid (UA). Three different LbL architecture films were investigated: LbL films of clay (PEI/Na+MMT) and phthalocyanine (PEI/NiTsPc) in a bilayer structure with a conventional polyelectrolyte (PEI) and a composite film formed by both materials to verify the synergistic effect in the LbL film in a quadri-layer assembly (PEI/Na+MMT/PEI/NiTsPc). Structural characterization indicated molecular level interactions between the layers forming the LbL films. The ITO/(PEI/Na+MMT/PEI/NiTsPc)(10) electrode exhibited a LOD of 1.0 mu mol L-1 and linear range 5-150 mu mol L-1. (C) 2017 Elsevier B.V. All rights reserved.
Descrição
Palavras-chave
Dopamine, Layer-by-layer, Nickel phthalocyanine, Montmorillonite clay, Electrochemical sensor
Como citar
Applied Surface Science. Amsterdam: Elsevier Science Bv, v. 436, p. 957-966, 2018.