Figure 3From: Combination of inverted pyramidal nanovoid with silver nanoparticles to obtain further enhancement and its detection for ricin Comparison of SERS spectra of Rh6G. (a) Comparison of SERS spectra obtained by solitary gold nanovoid substrate, silver nanoparticles, and combined substrate. (b) 1,507 cm−1 peak area comparison. For visualization, a factor of 50 is multiplied to the spectra which correspond to gold substrate and silver nanoparticles in a, and the scale of vertical axis in b is taken logarithm.Back to article page