3D silver metallized nanotrenches fabricated by nanoimprint lithography as flexible SERS detection platform

•Fabrication of plastic nanotrenches using nanoimprint lithography technique.•The analysis of surface roughness and morphology were made using SEM and AFM.•The SERS activity of the 4 Ag films was assessed using crystal violet as analyte.•LOD of 10 pM was reached in case of the Ag film of 25 nm thickness on nanotrenches.