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A novel photoelectrochemical aptasensor for the sensitive detection of miRNA‐21 was designed based on the sensitization effect of CdSe quantum dots as a signal amplification strategy. The TiO NTs/RGO/AuNPs electrode was prepared by the electrodeposition of graphene oxide and Au nanoparticles on TiO nanotubes with electrochemical reduction. The electrode was prepared as the matrix of the electrochemical aptasensor.
A novel, enhanced photoelectrochemical aptasensing platform was developed by integrating sensitization effect of CdTe@CdS core-shell quantum dots (QDs) coupled with exonuclease-I (Exo-I) assisted target recycling for significant signal amplification. Carcinoembryonic antigen (CEA) was selected as the target analyte to exhibit analytical performances of this platform.
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