Fig. 2. SEM images of (a) before the plasma treatment, (b–c) 30 min plasma treatment, (d–e) 60 min plasma treatment, and (f–g) 90 min plasma, and (h–i) 120 min plasma treatment on HOPG.

New Phys.: Sae Mulli 2024;74:366~373 https://doi.org/10.3938/NPSM.74.366

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