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

Table 1

SERS EFs for major Raman peaks for different SERS samples.

Raman peak (cm^−1)	The number of assembled layers
	1 layer	2 layers	3 layers	4 layers	5 layers	6 layers
1665 cm^−1	2.07 × 10^3	2.38 × 10^3	2.22 × 10^3	3.76 × 10^3	4.22 × 10^3	5.57 × 10^3
1478 cm^−1	6.05 × 10^2	6.33 × 10^2	5.81 × 10^2	8.05 × 10^2	6.98 × 10^2	1.24 × 10^3