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Development of SERS and GERS substrates to optimize in situ detection of mixed pesticides

Grant number: 23/04196-9
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): October 01, 2023
Effective date (End): May 31, 2027
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Priscila Alessio Constantino
Grantee:Henry Seitiro Kavazoi
Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
Associated research grant:18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis, AP.TEM


Paraquat (PQ) and diquat (DQ) herbicides are widely used worldwide, despite being considered highly toxic to human health and the environment. It is worth noting that PQ is banned in all countries that make up the European Union and also in China, the largest world producer of this herbicide. In Brazil, it was banned on September 22, 2020. In this sense, the development of methods and methodologies for the detection of these herbicides in the environment is of paramount importance. In this research project, the in situ SERS (surface-enhanced Raman scattering)/GERS (graphene-enhanced Raman scattering) technique will be used to detect and distinguish both herbicides. The substrates will be manufactured by modifying screen-printed carbon electrodes (SPE) via electrodeposition of metallic nanoparticles and graphene oxide. The films formed on the surface of the SPE will be characterized via SEM and micro-Raman spectroscopy. Furthermore, the modified SPE will be characterized in an inert support electrolyte, redox probe, and in the presence of PQ and DQ via cyclic voltammetry. In order to assess the effectiveness of substrates in enhancing the Raman signal, we will employ phthalocyanine as a probe molecule to conduct in situ SERS, GERS and SERS/GERS measurements. Subsequently, the substrates will be applied for the detection and differentiation of PQ and DQ herbicides in a mixture through in situ SERS/GERS measurements. (AU)

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