Fig. 41.

SEM images showing close packed films of the three nanocrystal shapes: (A) cubes, (B) cuboctahedra, and (C) octahedra; scale bars are 1 µm. (D) SERS spectra collected on LB films of each of the nanocrystal shapes 1 × 10⁻⁶ M arsenate solution. Peaks at 800 and 425 cm⁻¹ can be assigned to Na₂HAsO₄. (E) SERS response of octahedra LB arrays coated with various organic species. Benzenethiol (BT), hexadecanethiol (HDT), and mercaptodecanoic acid (MDA). Reproduced with permission from Reference (362). Wiley, Copyright (2008).