The role of reductant oxidation state in the formation and function of gold nanoparticle aggregates for SERS applications

Adam M. Schwartzberg; Abraham Wolcott; Trevor Willey; Tony van Buuren; Jin Z. Zhang

doi:10.1117/12.558778

14 October 2004 The role of reductant oxidation state in the formation and function of gold nanoparticle aggregates for SERS applications

Adam M. Schwartzberg, Abraham Wolcott, Trevor Willey, Tony van Buuren, Jin Z. Zhang

Author Affiliations +

Proceedings Volume 5513, Physical Chemistry of Interfaces and Nanomaterials III; (2004) https://doi.org/10.1117/12.558778
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

Sodium sulfide used to produce gold nanoparticle aggregates has been shown to require aging, however, until this work, few studies have attempted to ascertain the nature of this aging effect. UV-vis spectroscopy and other experimental evidence suggest that chemical changes take place during the aging process. NEXAFS has helped determine that sodium sulfide is oxidized over time to form, at least partially, sodium thiosulfate. Experiments performed with sodium thiosulfate yield similar results spectroscopically, however, in SERS experiments it is apparent that the surface chemistry is substantially different. This is likely due to both a lack of sodium sulfide and an increase in thiosulfate concentration. It has also been found that thiosulfate can be utilized for the reduction of several other metal salts into metal and, in some cases, metal sulfide nanoparticles, including copper, platinum, palladium, and silver.

Citation Download Citation

Adam M. Schwartzberg, Abraham Wolcott, Trevor Willey, Tony van Buuren, and Jin Z. Zhang "The role of reductant oxidation state in the formation and function of gold nanoparticle aggregates for SERS applications", Proc. SPIE 5513, Physical Chemistry of Interfaces and Nanomaterials III, (14 October 2004); https://doi.org/10.1117/12.558778

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