Fig. 3.

(A) Photographs depicting the separation process of the targeted molecules using magnetic quantum dots (MQDs) in aqueous suspension solution under excitation UV wavelength of 365 ​nm (a); SEM and laser confocal fluorescence microscopy images of MQD microspheres; and schematic design illustrating the magnetic capturing of hepatitis B surface antigen (HBsAg) and hepatitis B e-antigen (HBeAg) using MQD microspheres (c) [124]. (B) Selective electrochemical detection of HCV using AgNPs and GQD-SH nanocomposite as a substrate for HCV antibody loading [125]. (C) Schematic design for the HCV assay based on the ssDNA/MB@SiNPs/FTO electrode, Reproduced with permission [127].