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
• Start date: October 01, 2023
• End date: 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

Abstract

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)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

ZATTIM JR, CRISTIANO A.; KAVAZOI, HENRY S.; MIYAZAKI, CELINA M.; ALESSIO, PRISCILA. Investigating layer-by-layer films of carbon nanotubes and nickel phthalocyanine towards diquat detection. SCIENTIFIC REPORTS, v. 14, n. 1, p. 10-pg., 2024-07-17. (23/12756-4, 21/14235-6, 23/04196-9, 14/50869-6, 18/22214-6)

KAVAZOI, HENRY S.; MIYAZAKI, CELINA M.; CONSTANTINO, CARLOS J. L.; MARTIN, CIBELY S.; ALESSIO, PRISCILA. Selective Detection of Paraquat in Adulterated and Complex Environmental Samples Using Raman Spectroelectrochemistry. Applied Spectroscopy, v. 78, n. 9, p. 10-pg., 2024-08-01. (23/14967-2, 21/01161-4, 21/14235-6, 20/11803-0, 23/04196-9, 14/50869-6, 18/22214-6)