Synthesis by picosecond laser ablation of ligand-free Ag and Au nanoparticles for SERS applicationsEnza Fazio, Salvatore Spadaro, Marco Santoro, Sebastiano Trusso, Andrea. Lucotti, Matteo. Tommasini, Fortunato Neri and Paolo Maria OssiEPJ Web of Conferences, 167 (2018) 05002DOI: https://doi.org/10.1051/epjconf/201816705002