Table 1.

Sensitivity comparison of the Ag-ZnO/GCE electrode on 4-NP.

Electrode	Method	Detection Potential (V)	Linear Range (µM)	LOD (µM)	Ref.
AuNP/RGO	DPV	−0.6	0.05–2.0	0.01	40
Ag NWs-PANI	DPV	−0.77	0.6–32	0.052	41
GCE/Fe3O4-Pt	DPV	−0.73	0.1–1.5	0.048	42
Ag/RGO	SWV	−0.5	10–101	0.0012	43
ɤ-Fe2O3-N-rGO hydrogel	DPV	−0.3, −0.6	1–1000	0.1	7
Ag-ZnO/GCE	LSV	0.96	10–500	3	This work