Fig. 1

Synthesis and characterization of mAb-RSAu@AgNPs-4MBA. a Schematic diagram of synthesized mAb-RSAu@AgNPs-4MBA. b–c TEM images of AuNFs and RSAu@AgNPs, scale bars were 50 nm. d Comparisons: SERS efficiency of AuNFs-4MBA, RSAu@AgNPs-4MBA and mAb-RSAu@AgNPs-4MBA, AuNPs-4MBA, AgNPs-4MBA and Au@AgNPs-4MBA. The Raman signal was detected in 96-well micro-plates, and the exposure time was 20 s