Incorporation of gold nanoparticles into Langmuir-Blodgett films of polyaniline and montmorillonite for enhanced detection of metallic ions

Autor(es)

De Barros, A. ; Constantino, C. J. L. ; Bortoleto, J. R. R. ; Da Cruz, N. C. ; Ferreira, M.

• Tipo de documento: Artigo Científico
• Fonte: SENSORS AND ACTUATORS B-CHEMICAL; v. 236, p. 408-417, NOV 29 2016.
• Citações Web of Science: 9

Resumo

We report on effects from incorporating gold nanoparticles (AuNPs) into Langmuir-Blodgett (LB) films of emeraldine salt polyaniline (PAni-ES) and organophilic montmorillonite clay (OMt). The synergistic electrocatalytic effect induced by AuNPs led to an enhanced performance in detecting trace levels of cadmium (Cd2+), lead (Pb2+) and copper (Cu2+) ions. Detection was carried out using square wave anodic stripping (SWAS) voltammetry using ITO electrodes modified with LB films made with three supramolecular architectures: PAni-ES/AuNPs, OMt/AuNPs and OMt/AuNPs/PAni-ES, and compared to LB films without AuNPs. The incorporation of AuNPs induced secondary doping of PAni-ES, inferred from FTIR, Raman and UV-vis. absorption spectroscopies. The PAni-ES chains probably became more extended and could intercalate into the OMt galleries, causing an increased interlayer spacing according to X-ray diffraction data. These results demonstrate the possible control of film properties by exploiting molecular-level interactions in multicomponent nanostructured films. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 12/16158-0 - Filmes nanoestruturados de híbridos orgânico-inorgânicos para sensores ambientais
• Beneficiário: Marystela Ferreira
• Modalidade de apoio: 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
• Modalidade de apoio: Bolsas no Brasil - Doutorado