Surface-Enhanced Raman Spectroscopy Characterization of Salt-Induced Aggregation of Gold Nanoparticles

Matthew Y Chan; Weinan Leng; Peter J Vikesland

doi:10.1002/cphc.201700798

Surface-Enhanced Raman Spectroscopy Characterization of Salt-Induced Aggregation of Gold Nanoparticles

Chemphyschem. 2018 Jan 5;19(1):24-28. doi: 10.1002/cphc.201700798. Epub 2017 Dec 11.

Authors

Matthew Y Chan^{1

2}, Weinan Leng¹, Peter J Vikesland^{1

2}

Affiliations

¹ The Charles E. Via, Jr, Department of Civil and Environmental Engineering, Virginia Tech, 415 Durham Hall (MC 0246), 1145 Perry St., Blacksburg, VA, 24061, USA.
² Institute for Critical Technology and Applied Science, Virginia Tech, 227 Kelly Hall (MC 0193), 325 Stanger St., Blacksburg, VA, 24061, USA.

PMID: 29068113
DOI: 10.1002/cphc.201700798

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.

Keywords: Raman; SERS; gold; halides; nanoparticles.

Publication types

Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Bromides / chemistry*
Gold / chemistry*
Metal Nanoparticles / chemistry*
Sodium Chloride / chemistry*
Sodium Compounds / chemistry*
Sodium Fluoride / chemistry*
Sodium Iodide / chemistry*
Spectrum Analysis, Raman
Surface Properties

Substances

Bromides
Sodium Compounds
Sodium Chloride
Gold
Sodium Fluoride
Sodium Iodide
sodium bromide