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Silver nanoparticles synthesized by direct photoreduction of metal salts. Application in surface‐enhanced Raman spectroscopy
Author(s) -
SatoBerrú Roberto,
Redón Rocío,
VázquezOlmos América,
Saniger José M.
Publication year - 2009
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.2135
Subject(s) - raman spectroscopy , silver nanoparticle , colloid , nanoparticle , surface enhanced raman spectroscopy , cyan , spectroscopy , metal , chemistry , photochemistry , irradiation , ultraviolet visible spectroscopy , absorption spectroscopy , methyl orange , materials science , nuclear chemistry , raman scattering , nanotechnology , photocatalysis , organic chemistry , catalysis , optics , physics , quantum mechanics , nuclear physics
Abstract A simple synthesis method of silver nanoparticles and its application as an active surface‐enhanced Raman spectroscopy (SERS) colloid are presented in this work. The photoreduction of AgNO 3 in presence of sodium citrate (NaCit) was carried out by irradiation with different light sources (UV, white, blue, cyan, green, and orange) at room temperature. The evaluation of silver nanoparticles obtained as a function of irradiation time (1–24 h) and light source was followed by UV‐visible absorption spectroscopy. This light‐modification process results in a colloid with distinctive optical properties that can be related to the size and shape of the particles. The Ag colloids, as prepared, were employed as active colloids in SERS. Pyridine and caffeine were used as test molecules. Copyright © 2008 John Wiley & Sons, Ltd.