Gold nanoparticle assemblies with different particle densities were immobilized upon
functionalized glass substrates and their morphology and optical properties are analysed
with TEM and UV–vis absorption spectroscopy. The efficiency of self-assembled
gold colloidal nanoparticles as SERS-active substrates at 633 nm excitation line is
evaluated by employing p-aminothiophenol. The average enhancements in the range of
105–107
are consistent with signals being dominated by molecules adsorbed at junctions inside
nanoparticle assemblies. We employ an annealing treatment to induce changes in the initial
morphology of gold assemblies and produce sensitive LSPR substrate. The sensitivity of the
as-prepared substrate to transduce changes of the surrounding medium refractive index is
further assessed.
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