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Development of Modified Electrodes Based on Self Assembled Films of Polypirrole and Carbon Nanotubes Composites for Pesticides Monitoring

Published online by Cambridge University Press:  03 May 2016

Gabriela Martins de Araújo ,
Luis Antonio Polacci ,
Tatiana Mazo ,
Lúcia Codognoto  and
Fábio Ruiz Simões
Gabriela Martins de Araújo
Affiliation:
Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Almirante Saldanha da Gama, 89. CEP 11030-400, Santos – SP, Brazil
Luis Antonio Polacci
Affiliation:
Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Almirante Saldanha da Gama, 89. CEP 11030-400, Santos – SP, Brazil
Tatiana Mazo
Affiliation:
Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Almirante Saldanha da Gama, 89. CEP 11030-400, Santos – SP, Brazil
Lúcia Codognoto
Affiliation:
Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Rua Prof. Arthur Riedel, 275, CEP 09972-270, Diadema – SP, Brazil.
Fábio Ruiz Simões*
Affiliation:
Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Almirante Saldanha da Gama, 89. CEP 11030-400, Santos – SP, Brazil
*
*(Email: fabio.r.simoes@gmail.com)
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Abstract

In this work polypyrrole (PPy) and its respective composite with functionalized multiwalled carbon nanotubes (PPy-MWCNT) was obtained by the chemical polymerization of the monomer pyrrole (PPy) in aqueous solution by the dropwise addition of a solution of ammonium persulfate (PSA). The obtained PPy as well as its composite (PPy-MWCNT) were used to prepare two self-assembled films (SA) by the immersion of ITO blades (Inidium Tin Oxide) into PPy and PPy-MWCNT dispersions with alternated immersions into Polystyrene sulfonate (PSS) dispersion, thus resulting in a bilayer. The SA films were produced with ten bilayers (alternated layers of PPy or its composite). The obtained films were characterized by Fourrier Transformed Infrared Spectroscopy (FTIR), UV-Visible analysis, voltammetric analyses (square wave and cyclic voltammetry) and Scanning Electron Microscopy (SEM). The SA films were evaluated to determine the chlorothalonil pesticide which is commonly used as anti-fouling agent in marine environments. The SWV results showed a reduction peak at around -0.8 to 1.2 V (according to pH). It was also observed a synergic effect of the composite film (PPy-MWCNT/PSS) to determine the chlorothalonil by increase of the peak currents.

Keywords

self-assemblycompositesensor
Type
Articles
Information
MRS Advances , Volume 1 , Issue 21: Nanomaterials and Synthesis , 2016 , pp. 1561 - 1569
Copyright
Copyright © Materials Research Society 2016 

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