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. 2016 Aug 4;6:30849. doi: 10.1038/srep30849

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Copyright © 2016, The Author(s)

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(A) The impedance spectra for the process of modifying the electrode, the bare GCE (a), CD-NGs/GCE (b), CD-NGs@Ab₁/GCE (c), BSA/CD-NGs@Ab₁/GCE (d), CEA/BSA/CD-NGs@Ab₁/GCE (e) and NiAuPt-NGs@Ab₂/CEA/BSA/CD-NGs @Ab₁/GCE(f). (B) Amperometric curve of the immunosensor for the detection of different concentrations of CEA at −0.4 V (5 mmol/L H₂O₂). (C) Calibration curve of the immunosensor toward different concentrations of CEA. Error bar = RSD (n = 5).