Bimetallic Au//Ag alloys inside SiO2 using a solid state method
Author
dc.contributor.author
Díaz Valenzuela, Carlos
Author
dc.contributor.author
Valenzuela, M. L.
Author
dc.contributor.author
Bobadilla, D.
Author
dc.contributor.author
Laguna Bercero, M. A.
Admission date
dc.date.accessioned
2018-06-26T15:34:38Z
Available date
dc.date.available
2018-06-26T15:34:38Z
Publication date
dc.date.issued
2017
Cita de ítem
dc.identifier.citation
J Clust Sci (2017) 28: 2809–2815
es_ES
Identifier
dc.identifier.other
10.1007/s10876-017-1261-6
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/149237
Abstract
dc.description.abstract
Bimetallic Au/Ag nanostructures have been included inside SiO2 by pyrolysis of the macromolecular complexes Chitosan center dot(MLn/M'Ln)(n)center dot SiO2 and PSP-4-PVP center dot(MLn/M'Ln)(n)center dot SiO2 with MLn = AuCl3 and M'Ln = Ag(CF3SO3). The structural characterization was performed by XRD (X-ray diffraction of powder) and UV-Vis, and the microstructural characterization was done by SEM/EDS analysis HRTEM. The resulting products from the pyrolytic precursors PSP-4-PVP center dot(AuCl3/AgSO3CF3)(n)center dot SiO2 1:1 (1), PSP-4-PVP center dot(AuCl3/AgSO3CF3)(n)center dot SiO2 1:5 (2), Chitosan center dot(AuCl3/AgSO3CF3)(n)center dot SiO2 1:1 (3) and Chitosan center dot(AuCl3/AgSO3CF3)(n)center dot SiO2 1:5 (4) were Au/Ag//SiO2, Au//SiO2 and Ag//SiO2 as well as isolated Au and Ag, depending on the polymeric precursor. The Chitosan polymer precursor induces mainly Ag and Ag/SiO2 nanostructures, while PSP-4-PVP induces mainly Au/Ag//SiO2 nanostructures. This can be explained by the facility to link Ag+ to the NH2 and OH groups of Chitosan than to the pyridine of PSP-4-PVP. On the contrary, Au3+ exhibits most coordination ability to pyridine groups of PSP-4-PVP than NH2- and OH-groups of Chitosan. EDS mapping analysis indicates a uniform distribution of the Au/Ag nanostructure inside the SiO2 matrix. Using reflectance diffuse analysis, the plasmon is consistent with the Au/Ag alloys structure.
es_ES
Patrocinador
dc.description.sponsorship
Fondecyt
1120179
1160241
1131112
Consejo Superior de Investigaciones Cientificas, Spain
I-COOP LIGHT 2015CD0013