INVESTIGADORES
HOPPE Cristina Elena
congresos y reuniones científicas
Título:
Synthesis, Characterization and Stability of Carboxylate-modified Silver Cluster Powders Dispersible in Water
Autor/es:
M. J. RODRÍGUEZ-VÁZQUEZ; C. E. HOPPE; J. RIVAS; M. A. LÓPEZ-QUINTELA
Lugar:
Braga, Portugal
Reunión:
Conferencia; Nanospain 2008; 2008
Resumen:
Water-dispersible carboxylate-modified silver clusters have been synthesized in
a single-phase system by reduction of silver nitrate with sodium borohydride in
tetrahydrofuran, using several thio-carboxylic acids (mercaptoundecanoic acid,
mercaptosuccinic acid, L-glutathione reduced and N-(2-mercaptopropionyl)-glycin) as
stabilizing ligands. This method is based on the formation of polymeric precursors,
Ag(I)- thiolates, which generate carboxylate-stabilized metal clusters by chemical
reduction. Fast precipitation of the reaction products prevented growth and coalescence
enabling the synthesis of small silver clusters. The samples were characterized by
several techniques, like UV-vis and fluorescence spectroscopies, TEM, X-ray
diffraction, light scattering and others. This procedure opens new ways for biologicalapplications of the silver clusters