Au-Ag Core-Shell Nanospheres for Surface-Enhanced Raman Scattering Detection of Sudan I and Sudan II in Chili Powder

Figure 3

STEM-HAADF and EDS elemental mapping images for Au L map and Ag L map and an overlay of the Au and Ag maps of Au@Ag NPs (particle sizes about 120 nm). The scale bar in STEM-HAADF applies to all images.