Figure 4.
SEM images of carbon fibers (CFs) at different plasma treatment times: (a) untreated CF, (b) CF–AA15 (Ar 15 s, air 15 s), (c) CF–air, (d) CF–Ar, (e) CF–AA1 (Ar 1 min, air 1 min), and (f) CF–AA5 (Ar 5 min, air 5 min).
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