Fig. 8: Performance graph of NC@ZIF-8 under different test conditions.

a DPV curve corresponding to luteolin detection at 10 μM concentration by the optimized NC@ZIF-8/GCE at different pH values, and b the corresponding linear relationship between the pH and applied potential. c CV curves of NC@ZIF-8/GCE at different scan speeds, and d the corresponding linear relationship between the peak current and sweep rate.