INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Probing nanomaterials with absorption and emission of light
Autor/es:
JOSE HODAK
Lugar:
Buenos Aires
Reunión:
Workshop; The XVII Giambiagi Winter School; 2015
Institución organizadora:
Physics Department of Exact and Natural Sciences School of the University of Buenos Aires
Resumen:
Absorption and fluorescence emission allow simple means of accessing nanoscopic processes at nanoscopic scales. I will discuss the use of fluorescencemeasurements to study the permeation process of a fluorogenic probe across the walls of silica nano-shells, and the use of spatially resolved abrotption-emision experiments to study graphene oxide.A nanoparticle located in the interior of a nano-shell permits to activate a fluorescent probe to reveal kinetics parameters of diffusion across the nanoshell wall. Graphene oxide (GO) is a two dimensional material that can act as an insulator or a semiconductor depending on the degree of oxidation and it may be converted to graphene by chemical or photochemical means. I will present spatially resolved studies of the photo-reduction of GO single layers.Several processes are found to occur sequentially during the GO photo-reduction with optical properties as well as kinetic parameters showing heterogeneityacross individual GO fragments.