Fig. 11. (a) Scheme of the nanozyme activity of NADH and dopamine in the presence of 2D nanosheets. (b–d) NADH activity assay in the presence of 5 mM H₂O₂ (b) and the kinetic studies of NADH, measured at 340 nm at different concentrations of NADH (i) 10, (ii) 5, (iii) 2.5, (iv) 1.25, (v) 0.625, (vi) 0.312 to (vii) 0 mM (c and d). (e–g) Dopamine activity assay in the presence of H₂O₂ (e) and the kinetic assay mesured at various concentration of dopamine (f and g). The concentration of dopamine are, (i) 20, (ii) 10, (iii) 5, (iv) 2.5, (v) 1.25, to (vi) 0 mM. All studies have been done in 5 mM sodium phosphate buffer solution, pH 7.4.