fig8
Figure 8. (A) Schematic diagram of Au@Ag @SiO2-AuNP multilayer core-shell satellite nanostructure for the detection of alpha-fetoglobulin, (B) SERS spectra of 4-MBA-labeled Au@Ag@SiO2-AuNP nanoassemblies with different thicknesses of silver coating, (C) SERS spectra of 4-MBA-labeled Au@Ag@SiO2-AuNP nanoassemblies with different numbers of satellites per core and (D) SERS spectra of 4-MBA-labeled Au@Ag@SiO2-AuNP nanoassemblies with various sizes of satellite AuNPs[81]. (E) Schematic illustration of the structure of Au@Ag CSNSs and (F) their SERS spectra using different SERS substrates[116].
