Authors
Avi Saini, Thomas Maurer, Irene Izquierdo Lorenzo, André Ribeiro Santos, Jérémie Béal, Julie Goffard, Davy Gérard, Alexandre Vial, Jérôme Plain,
Title
Synthesis and SERS Application of SiO2@Au Nanoparticles
In
Plasmonics
Volume
10
Issue
4
Pages
791–796
Publisher
Springer
Year
2015
Publisher's URL
http://dx.doi.org/10.1007/s11468-014-9866-1
Indexed by
Abstract
In this letter, we report a chemical route for synthesizing SiO2@Au core-shell nanoparticles. The process includes four steps: (i) preparation of the silica cores, (ii) grafting gold nanoparticles over SiO2 cores, (iii) priming of the silica-coated gold nanoparticles with 2- and 10-nm gold colloids, and finally, (iv) formation of complete shell. The optical extinction spectra were experimentally measured and compared to numerical calculations in order to confirm the dimensions deduced from SEM images. Finally, the potential of such core-shell nanoparticles for biosensing was probed by means of surface-enhanced Raman scattering measurements and revealed higher sensitivities with much lower gold quantity of such core-shell nanoparticles compared to Au nanoparticles exhibiting similar diameters.
Affiliations
Offprint