Synthesis of core-shell nanoparticles and applications of said nanoparticles for surface enhanced Raman scattering
AssigneesUniversite Paris Diderot, Centre National de la Recherche Scientifique (CNRS), Institut De Physique Du Globe De Paris
InventorsIsraa Haidar, Daniel Neuville, Leila Boubekeur, Nordin Felidj
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Abstract
A method of synthesizing of gold-silver core-shell nanoparticles, from a colloidal aqueous solution of gold seeds with surfactant, the gold-silver core-shell nanoparticles being produced from anisotropic gold seeds, said method comprising adding to the colloidal aqueous solution a precursor of silver and a reducing agent, to produce the deposition of silver on the gold seeds in a step called principal, characterized in that the method has an incubation step of the colloidal aqueous solution containing the gold seeds with surfactant in the DMSO, prior to the principal step.
Claims25
A method of synthesizing gold-silver core-shell nanoparticles from a colloidal aqueous solution of gold seeds with surfactant, the gold-silver core-shell nanoparticles being produced from anisotropic gold seeds, characterized in that the method comprises successively:
- an incubation step of the colloidal aqueous solution containing the gold seeds with an initial surfactant, in a mixture of water solvents and DMSO, for a first given period of time, in order to modify the organization of the initial surfactant and the assembly of the gold seeds;
- a step adding an additional surfactant to the previous resultant mixture;
- a heating step for the resultant mixture, for a second given period of time;
- a step adding to the resultant mixture a precursor of silver and a reducing agent, to produce the deposition of silver onto the gold seeds in a step called principal during a third period of time;
- an extraction step of the nanoparticles.
Dependencies are inferred from the claim text.