830157.fig.005a
(a)
830157.fig.005b
(b)
830157.fig.005c
(c)
Figure 5: (a) Si nanotubes coated with Ag nanoparticles; (b) SERS spectra of R6G (at the concentration of 1 × 10−8 M) collected on Si wafer (curve A) and Si nanotubes (curve B); (c) The EDX spectroscopy of the samples in Figure 5(a)).