Silver-Graphene Oxide Nanocomposite Film-based SPR Sensor for Detection of Pb2+ Ions

This study discussed the effect of nanocomposite film's thicknesses on the generation of SPR for detection of Pb
²
+ ions. Ag-GO nanocomposite film was deposited on the hypothenuse side of the triangular prism via Kretschmann configuration. The thicknesses of Ag-GO were varied between 50nm and 60nm by manipulating the Ag's thicknesses from 30nm to 50nm and GO's between 2nm and 10nm. The optimum SPR signal was obtained as thickness of Au-GO was fixed at 50nm with tAg=48nm and t
_GO
=2nm resulting 75.77% of SPP excitation. As thicknesses of GO increased above 2nm and thicknesses of Ag were set less or more than 48nm, the SPP excitation became weaker. The sensitivity of SPR sensor shows a good agreement with the generation of SPP. The sensor exhibits the optimum sensitivity of s=0.452°/RIU with angle shifting of 0.905°as nanocomposite film under configuration of tAg=48nm: t
_GO
=2nm and tAg=50nm: t
_GO
=2nm were employed. In conclusion, the amplification of SPR sensor's sensitivity can be achieved by introducing 50nm nanocomposite films consist of ±2nm thicknesses of GO.