A comparison of the sensor performance with that of similar work based on different electrode fabrications using an electrochemical approach^a.

Modified GCE	DL	LDR	Sensitivity	Ref.
Co/ZnO NPs/GCE	178.8 pM	5.0 nM to 0.05 mM	53.1 μA μM−1 cm−2	66
ZnO/Al2O3/Cr2O3 NPs/GCE	1.34 pM	0.05 nM to 5.0 μM	70.9 μA μM−1 cm−2	This work

^aDL (detection limit) and LDR (linear dynamic range).