Surface-enhanced Raman scattering-active substrates of electrospun polyvinyl alcohol/gold-silver nanofibers

► Optical properties of PVA/Au-Ag alloy nanofibers can be tuned simply by varying the composition of the metals. ► PVA/Au-Ag alloy nanofibers achieved different SERS activities toward different analytes. ► PVA/Au-Ag nanofibers provided higher sensitivity compared to drop-cast film.