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Surface‐Enhanced Raman Spectroscopy Characterization of Salt‐Induced Aggregation of Gold Nanoparticles
Author(s) -
Chan Matthew Y.,
Leng Weinan,
Vikesland Peter J.
Publication year - 2018
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201700798
Subject(s) - raman spectroscopy , nanoparticle , characterization (materials science) , surface enhanced raman spectroscopy , salt (chemistry) , colloidal gold , spectroscopy , materials science , nanotechnology , chemical engineering , chemistry , raman scattering , optics , physics , quantum mechanics , engineering
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.