Gold aggregates on silica templates and decorated silica arrays for SERS applications |
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Authors: | F Castillo E De la Rosa and E Pérez |
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Institution: | (1) Institut f?r Physikalische Chemie, Friedrich-Schiller-Universit?t Jena, Helmholtzweg 4, 07743 Jena, Germany;(2) Institut f?r Photonische Technologien, Albert-Einstein-Str. 9, 07745 Jena, Germany |
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Abstract: | In this work, we report the fabrication and characterization of size controllable gold
nanoparticles (NPs) aggregates for their application in surface enhanced Raman scattering
(SERS). Aggregates were prepared using two methodologies: (i) by using silica particles
arrays as a template to agglomerate gold NPs between the inter-particle interstices, and
(ii) by functionalizing silica particles to be used as support to graft gold nanoparticles
and thus to form decorated silica particle arrays. These substrates were used in the
detection of Rhodamine 6G producing an enhancement factor (EF) from 104 to
106 that is associated to the increment of hot spot (HS) sites, and the fact
that plasmon resonance from aggregates and absorption wavelength of test molecules are
closely in resonance with excitation wavelength. The EF was also reduced when the plasmon
resonance was red-shifted as a result of the increment of aggregate size. In spite of
this, the EF is high enough to make these SERS substrates excellent candidates for sensing
applications. |
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Keywords: | |
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