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Digital photos of the char layers of (a, b) EP, (e, f) EP/CPPHS, and (i, j) EP/CP. SEM images of the char layers from (c) EP, (g) EP/CPPHS, and (k) EP/CP. Raman spectra of the char layers of (d) EP, (h) EP/CPPHS, and (l) EP/CP. Reproduced from ref . Copyright 2023 Elsevier.
