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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

High performance of electrochemical sensors based on LbL films of gold nanoparticles, polyaniline and sodium montmorillonite clay mineral for simultaneous detection of metal ions

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Autor(es):
de Barros, Anerise ; Leopoldo Constantino, Carlos Jose ; da Cruz, Nilson Cristino ; Ribeiro Bortoleto, Jose Roberto ; Ferreira, Marystela
Número total de Autores: 5
Tipo de documento: Artigo Científico
Fonte: Electrochimica Acta; v. 235, p. 700-708, MAY 1 2017.
Citações Web of Science: 10
Resumo

We report the effects of the incorporation of gold nanoparticles (AuNPs) into LbL films of emeraldine salt polyaniline (PAni-ES) and sodium montmorillonite clay mineral (Na+-MMT). We observed the higher performance of electrochemical sensors was induced by AuNPs towards trace level detection of cadmium (Cd2+), lead (Pb2+) and copper (Cu2+) ions. The detection was performed by square wave anodic stripping voltammetry (SWASV) using ITO electrodes modified with LbL films composed of three supramolecular architectures: PAni-ES/AuNPs, AuNPs/Na+-MMT and PAni-ES/AuNPs/Na+-MMT, which were compared to the LbL films without AuNPs. The results are consistent with the AFM dates indicating that the increase of roughness favors at low limit of detection for the sensors. The incorporation of AuNPs and PAni-ES leads to an interaction via ion-dipole, as characterized by FTIR and Raman spectra. This interaction, consequently, causes a more extended polymer chain, which intercalate into Na+-MMT galleries, according to X-ray diffraction data. The results demonstrate the possible control of film properties by exploiting molecular-level interactions in multicomponent nanostructured films favoring directly in electrochemical sensors response. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 12/16158-0 - Filmes nanoestruturados de híbridos orgânico-inorgânicos para sensores ambientais
Beneficiário:Marystela Ferreira
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 11/00733-2 - Filmes de nanocompósitos de polímeros condutores, nanopartículas de argila e nanopartículas de ouro para aplicação em sensores ambientais
Beneficiário:Anerise de Barros
Linha de fomento: Bolsas no Brasil - Doutorado