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

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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.

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Authors and Affiliations

  1. Departamento de Ciências do Mar, Universidade Federal de São Paulo, Av. Almirante Saldanha da Gama, 89. CEP, 11030-400, Santos, SP, Brazil

    Gabriela Martins de Araújo, Luis Antonio Polacci, Tatiana Mazo & Fábio Ruiz Simões

  2. Departamento de Ciências Exatas e da Terra, Universidade Federal de São Paulo, Rua Prof. Arthur Riedel, 275, CEP, 09972-270, Diadema, SP, Brazil

    Lúcia Codognoto

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  1. Gabriela Martins de Araújo
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  2. Luis Antonio Polacci
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  3. Tatiana Mazo
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  4. Lúcia Codognoto
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  5. Fábio Ruiz Simões
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de Araújo, G.M., Polacci, L.A., Mazo, T. et al. Development of Modified Electrodes Based on Self Assembled Films of Polypirrole and Carbon Nanotubes Composites for Pesticides Monitoring. MRS Advances 1, 1561–1569 (2016). https://doi.org/10.1557/adv.2016.308

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  • DOI: https://doi.org/10.1557/adv.2016.308

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