Figure 1From: Combination of inverted pyramidal nanovoid with silver nanoparticles to obtain further enhancement and its detection for ricin Nanostructure substrate fabrication process. (a) Deposit a layer of Cr on (100) oriented silicon wafer. (b) Define arrays of apertures on Cr mask by EBL. (c) Anisotropic KOH etching. (e) Remove Cr mask. (f) Deposit 200nm thick gold film. (g) Drop silver colloid onto the substrate. d and h are zoomed from c and g, respectively.Back to article page