INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Photochemistry and Photophysics of dyes linked to metal nanoparticles
Autor/es:
SABRINA SIMONCELLI, PEDRO F. ARAMENDÍA
Lugar:
San Carlos de Bariloche
Reunión:
Workshop; EULASUR Summer School and Workshop; 2010
Resumen:
The research aims to study how the photochemical processes and kinetics of dyes, linked in a controllable way in the proximity of a metal nanoparticle surface, are affected by it. We are currently working in the synthesis of monodispersed gold nanoparticles (AuNP) and in functionalizing them with phothocromic and fluorescent dyes using silica layers as well as DNA as a NP dye spacer. Optimized design of NP hybrids sensors aims to study the dynamics of fluorescence and phothochromic transformation by means of steady state and time resolved fluorescence spectroscopy, as well as by nano and femtosecond laser flash photolysis measurements. We have recently observed that gold nanoparticles of 88 nm enhance the fluorescence of a fluorophore depending on the distance from the surface. These results are in good agreement with theoretical calculations previously performed in our group.Additionally, Au-SiO2 NPs has been functionalized with a photochromic compound that is usually used in electron transfer studies. After flash photolysis, NP aggregation is observed. These encouraging results open the possibility of using functionalized gold nanoparticles to investigate the kinetic´s of AuNP dye hybrids and optimize the performance for sensing and biological tracking. However, is still left to improve nanoparticle functionalization, so as to avoid silica second nucleation as well as to synthesize new amino reactive photochromic compounds.