Fig. 11
From: Nanostructured plasmonic substrates for use as SERS sensors
a, c Reproduced with permission from Ref. [68], © 2015, John Wiley and Sons
Random hot-spot generation via Ag nanowire stacking. a Filtration of an Ag NW solution to produce randomly stacked Ag NWs. b SEM image of 3D stacked Ag NWs on a glass filter. c SEM image of 3D hybrid nanostructures (Ag nanoparticles/alumina/Ag NWs).