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Self-assembled films based on polypyrrole and carbon nanotubes composites for the determination of Diuron pesticide

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Abstract

In this work, polypyrrole (PPy) and its respective composite with functionalized multi-walled carbon nanotubes (MWCNT) were obtained by chemical polymerization of the monomer pyrrole in aqueous solution. The obtained PPy as well as its composite (PPy-MWCNT) were characterized by Fourier transform infrared spectroscopy (FTIR) and were used to produce nanostructured self-assembled (SA) films deposited onto glass substrates covered with indium tin oxide (ITO). The SA films were produced with alternated layers of polystyrene sulphonated (PSS) and were characterized by UV-visible, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) analyses. The applicability of the SA films was evaluated by square wave voltammetry (SWV) with standard additions of aliquots of Diuron pesticide in Britton-Robinson buffer solutions (pH = 2.0). The results showed an oxidation peak at 0.23 V which increases in function of the Diuron concentration for both the SA films. It was also observed that the SA film based on the composite (PPy-MWCNT/PSS) showed a peak current intensity about ten times higher in comparison with its unmodified counterpart (PPy/PSS) for a Diuron concentration of 4.29 × 10−5 mol L−1, indicating a synergic effect between PPy and MWCNT in the composite. The limits of quantification (LOQ) and limits of detection (LOD) were respectively 8.6 × 10−7 mol L−1 and 2.6 × 10−7 mol L−1.

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Acknowledgements

The authors thank the São Paulo Research Foundation (FAPESP 2014/23858-3) for providing financial and technical support to this project and CAPES for providing the fellowship.

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Authors and Affiliations

  1. Programa de Pós Graduação em Ciência e Tecnologia da Sustentabilidade, Campus Diadema, Universidade Federal de São Paulo, Diadema, SP, Brazil

    Gabriela Martins de Araújo

  2. Departamento de Ciências do Mar, Universidade Federal de São Paulo, Rua Carvalho de Mendonça, 144, Santos, SP, 11070-100, Brazil

    Gabriela Martins de Araújo & Fábio Ruiz Simões

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  1. Gabriela Martins de Araújo
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  2. Fábio Ruiz Simões
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Correspondence to Fábio Ruiz Simões.

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de Araújo, G.M., Simões, F.R. Self-assembled films based on polypyrrole and carbon nanotubes composites for the determination of Diuron pesticide. J Solid State Electrochem 22, 1439–1448 (2018). https://doi.org/10.1007/s10008-017-3807-9

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  • DOI: https://doi.org/10.1007/s10008-017-3807-9

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