Abstract
In this work a surface-enhanced Raman scattering (SERS) study was carried out, in order to determine the dependence of crystal violet (CV) SERS intensity on the size of gold nanoparticles (GNPs) synthesized by reduction with polyethylene glycol (PEG), with molar masses 200 and 10000. By using UV-Vis spectroscopy and transmission electron microscopy (TEM), the size of the synthesized nanoparticles, in the range of 7–60 nm, showing spherical and polygonal geometries, was determined. Zeta potential measurements were performed in order to assess the stability of the gold colloids. The SERS spectra of different concentrations of CV analyte, using 7 to 60 nm diameter PEG-coated GNPs, were recorded to determine the optimal size of the nanoparticles that provides the highest SERS intensity. This study confi rms that the intensity of the SERS signal increases with increase in the diameter of the GNPs.
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