Figure 1

Synthetic route for the preparation of Type I-III surfaces (experimental details are described in the Methods section and in the Supporting Information). Type 0: amino-functionalised glass. Type I: gold nanostars (GNS) monolayer on glass. Type II: SiO2-coated GNS monolayer. Type III: Silver nanoparticles (AgNP) decorated surface with underlying monolayer of GNS.