Ag nanoparticles agargel nanocomposites for SERS detection of cultural heritage interest pigments
Dept. of Physics and Chemistry, University of Palermo, Via Archirafi 36, I-90123, Palermo, Italy
2 AteN Center, University of Palermo, Viale delle Scienze - Ed.18, I-90128, Palermo, Italy
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Accepted: 26 January 2018
Published online: 26 February 2018
Agarose gel (agargel) composites with commercial and laboratory made silver nanoparticles were prepared by a wet solution method at room temperature. The gel composites were used for pigment extraction and detection by Raman spectroscopy. Red (alizarin) and violet (crystal violet) pigments deposited on paper were extracted by the composites and were investigated by micro-Raman spectroscopy. Evaluation was carried out of the surface-enhanced Raman spectroscopy (SERS) effect induced by the silver nanoparticles embedded in the gel. A kinetic approach as a function of time was used to determine the efficiency of pigments extraction by composites deposition. A non-invasive extraction process of few minutes is demonstrated. This process induces active SERS for both used pigments. The reported results show the full exploitability of agargel silver nanoparticle composites for the extraction of pigments from paper based artworks.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2018