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Cu/Ag-based bifunctional nanoparticles obtained by one-pot laser-assisted galvanic replacement

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Abstract

We have prepared, for the first time, stable and uncapped Ag/Cu-based bifunctional nanoparticles (NPs) (BFNPs) in water, by combining ps laser ablation in liquid environment and galvanic replacement. The particles were obtained in a single step by 1,064 nm irradiation of a Cu target in water solutions of AgNO3 or AgNO2. Under proper salt concentration and irradiation conditions, the laser beam activates formation of deep orange colloids, which are positively charged and stable for weeks. High resolution transmission electron microscopy (HRTEM) analysis showed a predominance of composite crystalline nanostructures with size in the 1–15 nm range and consisting of fcc Ag and fcc Cu (or its oxides). While CuO tenorite crystalline phase was detected by HRTEM, X-ray photoelectron spectroscopy analysis permitted to observe also the Cu(I) oxidation state of Cu, being the Cu(I)/Cu(II) ratio different in the samples obtained in AgNO3 or AgNO2 baths. Functionalization with organic ligands and subsequent Raman tests demonstrated the SERS activity of the BFNPs and the existence of different complexing surface sites.

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Acknowledgments

Funds from the Project NABLA (Decree n.4508-September 1, 2010 by Regione Toscana-Italy, PAR FAS 2007–2013 funds, Action 1.1.a.3) and Project PRIN2009 “Novel plasmon-based processes and materials for sensor applications” of the Italian Ministry of Research are acknowledged.

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Authors and Affiliations

  1. Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, Sesto Fiorentino, Florence, Italy

    Emilia Giorgetti & Paolo Marsili

  2. Department of Molecular Sciences and Nanosystems, University of Venezia, Mestre, Italy

    Patrizia Canton

  3. Department of Chemistry “U. Schiff”, University of Firenze, Florence, Italy

    Maurizio Muniz-Miranda & Stefano Caporali

  4. Department of Physics “E. Fermi”, University of Pisa, Pisa, Italy

    Francesco Giammanco

Authors
  1. Emilia Giorgetti
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  2. Paolo Marsili
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  3. Patrizia Canton
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  4. Maurizio Muniz-Miranda
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  5. Stefano Caporali
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  6. Francesco Giammanco
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Correspondence to Emilia Giorgetti.

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Giorgetti, E., Marsili, P., Canton, P. et al. Cu/Ag-based bifunctional nanoparticles obtained by one-pot laser-assisted galvanic replacement. J Nanopart Res 15, 1360 (2013). https://doi.org/10.1007/s11051-012-1360-0

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