“…Conversely, polymergrafted plasmonic metal nanoparticles (PGNPs) are composed of polymer ligands grafted on metal NP cores. 26,34,35 Polymer ligands with high steric hindrance provide remarkable colloidal stability to metal NPs. Upon changing the solvent quality to the polymer, PGNPs can cluster, allowing the precise control of the nanogap between adjacent metal NPs.…”