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SEM and energy spectra images of analysis system. (A): SEM of CDFe; (B): SEM of CDFeN; (C): energy spectrum of CDFe; (D): energy spectrum of CDFeN; (E): Analysis system without urea, 0.08 μg/ml CDFeN+ 5.0 μmol/L H2O2+ 0.03 mmol/L TMB+ 0.51 mmol/L pH 4.07 Tris-HCl+10 nmol/L Apt+0.08 mmol/L AgNPs; (F): Analysis system with urea. E+12.5 nmol/L Urea.
