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Silicon nanowires coated with silver nanostructures as ultrasensitive interfaces for surface-enhanced Raman
Elisabeth Galopin1, Jacques Barbillat, Yannick Coffinier
1Institut de Recherche Interdisciplinaire (IRI, USR-CNRS 3078) and Institut d'Electronique, de Microelectronique et de Nanotechnologie (IEMN, UMR-CNRS 8520), Cite Scientifique, Avenue Poincare - BP 60069, 59652 Villeneuve d'Ascq, France.
Abstract:
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 x 10(8). This large enhancement factor was attributed to the presence of "hot" spots on the SiNWs/Ag NPs substrate.
