Silicon nanowires coated with silver nanostructures as ultrasensitive interfaces for surface-enhanced Raman spectroscopy

E. Galopin (1, 2) , J. Barbillat (3) , Yannick Coffinier (1) , Sabine Szunerits (1, 4) , G. Patriarche (5) , Rabah Boukherroub (1)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 IRI - Institut de Recherche Interdisciplinaire [Villeneuve d'Ascq]
3 LASIRE - Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516
4 LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces
5 Laboratoire de Photonique et Nanostructure, CNRS

Silver nanoparticles (Ag NPs) were chemically deposited on silicon nanowires (SiNWs), prepared using the vapor−liquid−solid (VLS) growth mechanism, using an in situ electroless metal deposition technique. The resulting SiNWs/Ag NPs composite interfaces showed large Raman scattering enhancement for rhodamine 6G (R6G) with a detection limit of 10⁻¹⁴ M and an enhancement factor of 2.3 × 10⁸. This large enhancement factor was attributed to the presence of “hot” spots on the SiNWs/Ag NPs substrate.

Mots clés: silicon nanowires; silver nanoparticles; high sensitivity

Domaines: Micro et nanotechnologies/Microélectronique

E. Galopin, J. Barbillat, Yannick Coffinier, Sabine Szunerits, G. Patriarche, et al.. Silicon nanowires coated with silver nanostructures as ultrasensitive interfaces for surface-enhanced Raman spectroscopy. Applied Materials & Interfaces, 2009, 1, pp.1396-1403. ⟨10.1021/am900087s⟩. ⟨hal-00413200⟩