In Situ Detection of Trace Furfural in Aqueous Solution Based on Au Nanoparticle/Au Film Surface-Enhanced Raman Spectroscopy

Figure 4

SERS spectra of (a) the SERS substrate sample (six-layered) and (b) 0.1 mol/L furfural aqueous solution collected on different substrate samples assembled from one to six layers and Au film without AuNPs. The bottom line (grey trace) indicates the NRS signal of 0.1 mol/L furfural.

(a)

(b)