Surface‐Enhanced Raman Spectroscopy Characterization of Salt‐Induced Aggregation of Gold Nanoparticles
Matthew Y. Chan 2018 ChemPhysChem v19 p24-28

Low‐frequency (<300 cm−1) vibrational interactions between gold surfaces and dissolved halides in water were investigated by surface‐enhanced Raman spectroscopy (SERS). Experiments with NaF, NaCl, NaBr, and NaI salts indicate that the Raman shifts of the Au‐X− SERS bands correlate with the bond strength of the corresponding covalent interaction. These low‐frequency SERS bands open up new means to investigate the aggregation of nanoparticles in aqueous environments.