Advanced Materials

Cover image for Vol. 26 Issue 48

18_21/2006Cover Picture: Metal–Silica Hybrid Nanostructures for Surface-Enhanced Raman Spectroscopy (Adv. Mater. 21/2006)

The image shows an ordered array of silver-tipped silica nanorods, which serve as a substrate for surface enhanced Raman spectroscopy (SERS). Signal intensities from test molecules in regions of aggregated pillars (indicated by the green laser beam) were enhanced by factors of 10 to 20 compared to arrays of separated pillars, as reported by Moskovits and co-workers on p. 2829. This hybrid structure maximizes SERS signal intensities from analytes while minimizing the quantities needed for detection due to the precise formation of “hot regions” at the intersection of the silver tips.

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