Fig. 6
a EIS responses of the anti-E. coli/EDC/Ag@BSA nanoflower fabricated biosensor at different concentrations of E. coli (0, 3.0 × 102, 3.0 × 103, 3.0 × 104, 3.0 × 105, 3.0 × 106, 3.0 × 107, 3.0 × 108 cfu mL−1, a–h) in the presence of a redox probe. b Calibration curve for change in electron transfer resistance with logarithm of E. coli concentration. Inset: the equivalent circuit model