Ag nanoparticles agargel nanocomposites for SERS detection of cultural heritage interest pigments F. Amato, C. Micciche’, M. Cannas, F. M. Gelardi, B. Pignataro, M. Li Vigni and S. Agnello Eur. Phys. J. Plus, 133 2 (2018) 74 Published online: 26 February 2018 DOI: 10.1140/epjp/i2018-11907-2