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Figure 2. Investigating the size and morphology according to carbon coating. Top-view of the SEM images of (A and B) SiNPs; (C and D) SiNP@C; and (E and F) SiNP@EC; (G) The comparison of primary particle size of each SiNP, SiNP@C, and SiNP@EC; (H) The simple mathematical calculation of 300% volumetric expanded primary particle size of SiNP. SEM: Scanning electron microscopy.