Graphene oxide supported rhombic dodecahedral Cu2O nanocrystals for the detection of carcinoembryonic antigen

In this work, a simple electrochemical immunosensor was developed for the detection of carcinoembryonic antigen (CEA) based on rhombic dodecahedral Cu 2 O nanocrystals–graphene oxide–gold nanoparticles (rCu 2 O–GO–AuNPs). GO as the template and surfactant resulting in rCu 2 O exhibit improved rhombic dodecahedral structure uniformity and excellent electrochemical performance. Moreover, GO was found to be able to effectively improve the long stability of rCu 2 O on the electrode response . Under optimal conditions, the immunosensor showed a low limit of detection (0.004 ng ml −1 ) and a large linear range (0.01–120 ng ml −1 ). This work presents a potential alternative for the diagnostic applications of GO-supported special morphology materials in biomedicine and biosensors.