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Particle size distribution of CDFeN-H2O2-TMB-Tris-HCl-Apt-Urea-AgNPs system. a: 0.08 μg/ml CDFeN+ 5.0 μmol/L H2O2+ 0.03 mmol/L TMB+ 0.51 mmol/L Tris-HCl (PH = 4.07)+10 nmol/L Apt+ Urea+0.08 mmol/LAgNPs; b: a+5.0 nmol/L Urea; c: a+12.5 nmol/L Urea.
