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Fabrication and characterization of nanostructured films composed of electrochemically reduced graphene oxide and magnetite nanoparticles for carbofuran detection

Grant number: 17/19630-5
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): December 01, 2017
Effective date (End): November 30, 2018
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal researcher:Marystela Ferreira
Grantee:Ângela Maria Adriano
Home Institution: Centro de Ciências e Tecnologias para a Sustentabilidade (CCTS). Universidade Federal de São Carlos (UFSCAR). Sorocaba , SP, Brazil

Abstract

This project aims at the modification of indium-doped tin oxide (ITO) electrodes by the electrochemical reduction of graphene oxide (GO) generating ITO electrodes coated with reduced graphene oxide (RGO). These electrodes will be functionalized with Layer-by-Layer (LbL) films of magnetite nanoparticles (Fe3O4) interspersed with polyelectrolytes. The electrochemical reduction will be performed by two different means: reduction through the GO suspension and reduction of a previously automated GO film onto ITO. The Fe3O4 nanoparticles will be synthesized by the alkaline coprecipitation method, generating free Fe3O4 in solution or stabilized in the PDDA (Fe3O4-PDDA) polyelectrolyte. After being properly characterized, these nanoparticles will be used in the manufacture of LbL films intercalating with the negatively charged polyelectrolyte PSS, forming the ITO / RGO / (Fe3O4-free / PSS) architectures in ITO / RGO / (Fe3O4-PDDA / PSS ) n, where n indicates the number of deposited bilayers. These films will be tested for the detection of carbofuran (CBF), a highly toxic pesticide used in crops, with a strong appeal for the development of fast and efficient methods for its quantification. Electrochemical methods of differential pulse voltammetry (VPD) and amperometry will be tested for CBF detection. The analytical parameters of the sensor will be studied looking for the architecture with greater sensitivity and selectivity. (AU)

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