Table 1.

Absorption maxima and calculated enhancement factor (EF) values for each surface-enhanced Raman spectroscopy (SERS) system.

SERS System	Absorption Maxima (nm)	SERS Enhancement Factor (EF)
AuNP	521	1.1 × 105
AuNP@30PDOP	528	0.25 × 105
AuNP@60PDOP	529	0.05 × 105
AuNP@180PDOP	532	0.04 × 105
AuNP@30PDOP@30AgNP	496	3.5 × 105
AuNP@60PDOP@30AgNP	501	1.25 × 105
AuNP@180PDOP@30AgNP	455	0.8 × 105
AuNP@30PDOP@60AgNP	490	1 × 105
AuNP@60PDOP@60AgNP	492	0.38 × 105
AuNP@180PDOP@60AgNP	455	0.3 × 105