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. 2023 Jun 10;9(6):e17170. doi: 10.1016/j.heliyon.2023.e17170

Fig. 6.

Fig. 6

Cross-sectional SEM images of the samples with varying Cu plate diameter before antibacterial activity testing: (S1) 5 mm, (S2) 7.5 mm, (S3) 10 mm, (S4)12.5 mm, (S5) 15 mm.