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(a) Real-time responses of Love mode sensor to 50 ng/mL CEA in the immunoassay with −out AuNPs. (b) Real-time responses of the sensor to 1 ng/mL CEA in the AuNP simplified sand −wich immunoassay. (c) Real-time responses of sensor to CEA with the concentration varying from 0.2 ng/mL to 50 ng/mL. (d) Measured frequency shifts as a function of CEA concentration.
