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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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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Author(s):
de Barros, Anerise ; Leopoldo Constantino, Carlos Jose ; da Cruz, Nilson Cristino ; Ribeiro Bortoleto, Jose Roberto ; Ferreira, Marystela
Total Authors: 5
Document type: Journal article
Source: Electrochimica Acta; v. 235, p. 700-708, MAY 1 2017.
Web of Science Citations: 10
Abstract

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)

FAPESP's process: 11/00733-2 - Nonocomposites films of conducting polymers, clay nanoparticles and gold nanoparticles for environmental sensor aplication
Grantee:Anerise de Barros
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 12/16158-0 - Nanostructured films inorganic-organic hybrids for environmental sensors
Grantee:Marystela Ferreira
Support Opportunities: Regular Research Grants