Figure 2:

SEM images of different types of SERS substrates. (A) Spherical gold nanoparticles [50], (B) gold nanorods [91], (C) silver nanobar [92], (D) silver plasmonic nanodome array [93], (E) gold nanocluster [94], (F) gold nanoholes [67], (G) silver nanovoids [73], (H) silver nanocolumnar film [95], and (I) silver nano-pillars [96]. Reproduced with permission from Refs. [50], [67], [73], [91], [92], [93], [94], [95], [96].

© De Gruyter