Advanced search
Start date
Betweenand


Development of nanostructured sensors for chemical analysis by means of spectroscopic techniques

Full text
Author(s):
Jean Claudio Santos Costa
Total Authors: 1
Document type: Doctoral Thesis
Press: São Paulo.
Institution: Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ)
Defense date:
Examining board members:
Paola Corio; Koiti Araki; Celly Mieko Shinohara Izumi; Luiz Fernando Cappa de Oliveira; Denise Freitas Siqueira Petri
Advisor: Paola Corio; Liane Marcia Rossi
Abstract

The use of spectroscopic techniques to the study of environmental issues is an area of research that has been experiencing major development in recent times. The sensitivity and selectivity characteristics of surface-enhanced Raman scattering (SERS) suggest that this technique can be very useful for the study of complex samples, such as those related to the investigation of pollutants in the environment. The focus of this thesis is dedicated to the development of methodologies for the use of the SERS effect to the spectroscopic study of different classes of chemical species of environmental interest. The construction of high-performance substrates for SERS is investigated aiming for their use as analytical sensors, identification, quantification and study of aspects related to the reactivity of polycyclic aromatic hydrocarbons (PAH), organophosphorus compounds, organochlorine compounds and triazinic compounds. Among the investigated substrates, we mention colloidal gold and silver nanoparticles of different shapes (nanorods, nanocubes, nanowires and bimetallic particles) and gold and silver nanoparticles immobilized on polymeric films. We seek to establish correlations between morphology and chemical composition of nanostructures and adsorption mechanisms of the investigated molecules on the metal substrates. We use DFT calculations (Density Functional Theory) to simulate possible adsorbate-nanoparticle interactions, allowing a better understanding of the processes of chemical interaction between the metal nanostructures and the substances of interest. (AU)

FAPESP's process: 06/06629-4 - Development of nanostructured sensors for chemical analysis using spectroscopic techniques
Grantee:Jean Claudio Santos Costa
Support Opportunities: Scholarships in Brazil - Doctorate (Direct)