Adsorption mechanism of carboxylated molecules: nanoparticle morphology-dependence and microfluidic device application on SERS

• Grant number: 21/13703-6
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: June 01, 2022
• End date: May 31, 2023
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Carlos José Leopoldo Constantino
• Grantee: Guilherme Dognani
• Supervisor: Santiago Sánchez-Cortés
• Host Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
• Institution abroad: Centro de Física Miguel Antonio Catalán (CFMAC), Spain
• Associated to the scholarship: 20/06577-1 - DEVELOPMENT OF HYBRID SYSTEMS OF CELLULOSE MICROFIBERS AND GOLD NANOPARTICLES FOR REMOVAL AND DETECTION (VIA SERS) OF EMERGING CONTAMINANTS IN AQUEOUS MEDIA, BP.PD

Abstract

This research project internship abroad (BEPE) is related to the post-doctorate project FAPESP 2020/06577-1, which involves the detection of the emerging contaminates 2,4-D (herbicide), ibuprofen (medicine) and, 17²-estradiol (endocrine disruptor) by surface-enhanced Raman scattering (SERS), using cellulose/NPs-based platform as SERS substrate. This BEPE project is complementary to the proposal of the Brazilian post-doctorate project in progress, once the gold nanoparticles (AuNPs), currently synthesized, will be obtained with different morphologies. Besides, the morphology of the NPs will be evaluated on detection of carboxylated molecules, such as 2,4-D and ibuprofen, which is not a straightforward process, discussing the adsorption mechanism of analyte/NPs and the detection efficiency by qualitative and quantitative approaches. To complement the morphology studies, a microfluidic-SERS device will be evaluated visioning improving the reproducibility of the SERS signal in terms of intensity, which remains a challenge for the area thinking in SERS as a routine analytical technique. For this purpose, NPs will be in situ synthesized into the device, and the contaminant, inserted through another channel, will be detected when exposed to the excitation laser line. For that, we will have the collaboration of Dr. Santiago Sanchez Cortés from CSIC/Madrid, Spain, a specialist in the synthesis of metallic nanoparticles for SERS analytical application in the detection of diverse analytes, and with whom our Research Group has already established an important collaboration. (AU)