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SERS intensity optimization by controlling the size and shape of faceted gold nanoparticles
Author(s) -
Sabur Alia,
Havel Mickael,
Gogotsi Yury
Publication year - 2008
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1814
Subject(s) - colloidal gold , raman spectroscopy , nanoparticle , ionic strength , yield (engineering) , nanotechnology , molecule , intensity (physics) , materials science , surface enhanced raman spectroscopy , chemistry , analytical chemistry (journal) , raman scattering , optics , aqueous solution , physics , chromatography , composite material , organic chemistry
In this work, we experimentally investigated the surface‐enhanced Raman spectroscopy (SERS) activity of faceted gold nanoparticles, which have been theoretically predicted to yield giant enhancements. Glycine was used to determine the SERS activity as a function of pH and ionic strength and to estimate the corresponding enhancement factor (EF). By optimizing the synthesis conditions of the flat prismatic nanoparticles, it was possible to control their size and shape. We demonstrate that the maximum SERS intensity increases with the edge length of the triangle, reaching a maximum EF of ∼10 13 for 1.9 µm triangles (the largest tested). The corresponding glycine detection limit was as low as 10 −12 M , close to the single‐molecule threshold. Copyright © 2007 John Wiley & Sons, Ltd.