The aim of this master thesis is to fabricate and characterize Surface Enhanced Raman Scattering (SERS) probes and optimize the Raman measurements for the detection of contaminants in water in a small amount of concentration. ?? The thesis has been realized in the framework of “RaPID” project, a project funded by NATO SPS (North Atlantic Treaty Organization, divison of Science for Peace and Security). RaPID stands for Raman Probe for chemical contaminant IDentification; the goal of this project is to realize a portable device able to detect low concentrations of contaminants in water with a relatively rapid analysis in order to understand if they’re below a precise guard level imposed by law.