@inproceedings{5acaa952080246da871abcba0e9e4912,
title = "Synthesis and stabilization of colloidal gold nanoparticle suspensions for SERS",
abstract = "Colloidal gold nanoparticles were synthesized by thiosulfate reduction of aqueous HAuCl4. Nanoparticle flocculation was controlled by addition of a stabilizing agent (e.g., Na2SO4 or NaCl) 5 minutes into the reaction. Synthesis kinetics were followed by monitoring the growth in intensity of the surface plasmon resonance (SPR) at ~535 nm using visible-NIR absorption spectroscopy. In addition to the SPR, the time- dependent spectra also exhibited an extended plasmon band (EPB) in the NIR that initially increased in intensity and red- shifted with time before blue-shifting and eventually disappearing due to changes in nanoparticle flocculation. TEM and x-ray diffraction measurements showed that the resultant nanoparticles were predominantly spherical in shape and ~20-30 nm in diameter. Surface chemistry was confirmed using XPS. The stabilizing agent was found to play a key role in the subsequent SERS activity of the nanoparticles by adsorbing to their surface, preventing premature nanoparticle aggregation and mediating the analyte-nanoparticle interaction.",
author = "Davis, {Paul H.} and Morrisey, {Cody P.} and Tuley, {Sean M.V.} and Bingham, {Chris I.}",
year = "2008",
month = sep,
day = "19",
doi = "10.1021/bk-2008-0996.ch002",
language = "English",
isbn = "9780841269699",
series = "ACS Symposium Series",
publisher = "American Chemical Society",
pages = "16--30",
booktitle = "Nanoparticles",
address = "United States",
}