Fig. 2: Microscopic characterizations of plastic-derived SACs.

a TEM images of five SACs derived from single-type plastics. b HAADF-STEM images of five SACs derived from single-type plastics and single atoms are circled in red. c TEM images of five SACs derived from mixed plastics (MPs). d HAADF-STEM images of five SACs derived from MPs and single atoms are circled in red. e HAADF-STEM and the corresponding EDS mapping images of five SACs derived from MPs. The scale bar is 500 nm.