Silica-coated gold nanorod arrays for nanoplasmonics devices.
A facile method for growing silica layer on lithographically designed gold nanorod arrays (GNRAs) using a convenient sol-gel method is presented herein. The silica layer thickness was controlled on GNRAs with the reaction time. The localized surface plasmon resonance (LSPR) spectra of these hybrid metal/dielectric nanoparticles were recorded before and after the coating and the effect of different solvents on the LSPR were also assessed. The change in the fluorescence and SERS intensities of a probe molecule (Rh6G) deposited on GNRAs and silica-coated GNRAs revealed that the as-fabricated silica layer does inhibit the quenching of molecular excited states and enhances photophysical/photochemical processes. This kind of hybrid metal/dielectric nanoparticle arrays hence turn out to be real good candidates to design new "plasmonic-active" devices.
Univ Paris Diderot, Sorbonne Paris Cité, ITODYS, UMR CNRS 7086 , 15 rue J-A de Baïf, 75205 Paris Cedex 13, France.
Ryohei
R
Yasukuni
Karima
K
Ouhenia-Ouadahi
Leïla
L
Boubekeur-Lecaque
Nordin
N
Félidj
François
F
Maurel
Rémi
R
Métivier
Keitaro
K
Nakatani
Jean
J
Aubard
Johan
J
Grand