Combined Chemical and Physical Encoding with Silk Fibroin‐Embedded Nanostructures

Nanostructures spun into regenerated silk fibroin fibers encode physical and chemical information. These materials are composed of Raman enhancing nanoscale structures whose location in a linear array and chemical functionality endow them with a tunable identity or code. These structures remain functional after being electrospun into fibroin fibers and report a unique spectroscopic signature to prove the authenticity of a material through their code and by uniquely linking it to the composition of the host material.