SERS Characterization of the Indocyanine-Type Dye IR-820 on Gold and Silver Nanoparticles in the Near Infrared

Figure 4

SERS spectra of IR-820 (a) at two solution concentrations on AgNP: (ii) 1 mol L⁻¹ and (iii) 0.1 mol L⁻¹, compared to the Raman spectrum of the dye at 100 mol L⁻¹; (b) at two solution concentrations on AuNP: (ii) 100 mol L⁻¹ and (iii) 10 mol L⁻¹, compared to the Raman spectrum of the dye at 100 mol L⁻¹. The spectrum labeled (i) in both items is the Raman spectrum of 100 mol L⁻¹ IR-820. (c) Extinction spectrum of the AuNPs and AgNPs used as SERS substrates.

(a)

(b)

(c)