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. 2022 Feb 21;17:26. doi: 10.1186/s13020-022-00569-9

Fig. 1.

Fig. 1

Characterization of materials. A The surface morphology of different coatings by SEM. B Surface element contents of different coatings by EDS. The solid red box showed the percentage of carbon. C Mass percentage (Wt%) of element content in different coatings. The total percentage was 100%. D The distribution of element C on the surface of the coating was analysed by EDS mapping. The more carbon, the darker the yellow. Scale bar = 50 μm