Fig. 6

SEM images of sample: (a1–3) morphological image of EG at ×500, ×2000, ×5000, respectively; (b1–3) morphological image of MEG at ×500, ×2000, ×5000, respectively.
SEM images of sample: (a1–3) morphological image of EG at ×500, ×2000, ×5000, respectively; (b1–3) morphological image of MEG at ×500, ×2000, ×5000, respectively.