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Bimetallic Au//Ag Alloys Inside SiO2 Using a Solid-State Method

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Abstract

Bimetallic Au/Ag nanostructures have been included inside SiO2 by pyrolysis of the macromolecular complexes Chitosan·(MLn/M′Ln)n·SiO2 and PSP-4-PVP·(MLn/M′Ln)n·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·(AuCl3/AgSO3CF3)n·SiO2 1:1 (1), PSP-4-PVP·(AuCl3/AgSO3CF3)n·SiO2 1:5 (2), Chitosan·(AuCl3/AgSO3CF3)n·SiO2 1:1 (3) and Chitosan·(AuCl3/AgSO3CF3)n·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.

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Acknowledgements

The authors acknowledge Fondecyt Projects 1120179, 1160241 and 1131112 for financial support. This research has also received funding from Consejo Superior de Investigaciones Científicas, Spain under Grant I-COOP LIGHT 2015CD0013. The use of Servicio General de Apoyo a las Investigación (SAI, University of Zaragoza) is also acknowledged.

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Authors and Affiliations

  1. Departamento de Química, Facultad de Química, Universidad de Chile, La Palmeras 3425, Nuñoa, Casilla 653, Santiago de Chile, Chile

    C. Diaz & D. Bobadilla

  2. Instituto de Ciencias Químicas Aplicadas, Inorganic Chemistry and Molecular Material Center, Universidad Autónoma de Chile, Av. El Llano Subercaseaux 2801, San Miguel, Santiago de Chile, Chile

    M. L. Valenzuela

  3. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC- Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009, Saragossa, Spain

    M. A. Laguna-Bercero

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  1. C. Diaz
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  2. M. L. Valenzuela
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  3. D. Bobadilla
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  4. M. A. Laguna-Bercero
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Correspondence to M. L. Valenzuela.

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Diaz, C., Valenzuela, M.L., Bobadilla, D. et al. Bimetallic Au//Ag Alloys Inside SiO2 Using a Solid-State Method. J Clust Sci 28, 2809–2815 (2017). https://doi.org/10.1007/s10876-017-1261-6

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