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Surface-Enhanced Raman Spectroscopy Characterization of Salt-Induced Aggregation of Gold Nanoparticles
Matthew Y Chan1,2, Weinan Leng1, Peter J Vikesland1,2
1The Charles E. Via, Jr, Department of Civil and Environmental Engineering, Virginia Tech, 415 Durham Hall (MC 0246), 1145 Perry St., Blacksburg, VA, 24061, USA.
Abstract:
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.
