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

Autor(es)

de Araujo, Gabriela Martins ^[1] ; Polacci, Luis Antonio ^[1] ; Mazo, Tatiana ^[1] ; Codognoto, Lucia ^[2] ; Simoes, Fabio Ruiz ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Paulo, Dept Ciencias Mar, Av Almirante Saldanha Gama 89, BR-11030400 Santos, SP - Brazil

^[2] Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, Rua Prof Arthur Riedel 275, BR-09972270 Diadema, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MRS ADVANCES; v. 1, n. 21, p. 1561-1569, 2016.
• Citações Web of Science: 1

Resumo

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. (AU)

• Processo FAPESP: 14/23858-3 - Desenvolvimento de materiais de sensores baseados em filmes automontados de polímeros condutores e nanotubos de carbono para a determinação de desreguladores endócrinos em ambientes marinhos
• Beneficiário: Fabio Ruiz Simões
• Linha de fomento: Auxílio à Pesquisa - Regular