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. 2021 Jul 7;11:14008. doi: 10.1038/s41598-021-92340-7

Figure 4.

Figure 4

Surface roughness (Ra, nm) of the uncoated NiTi alloy sample and the GO/AgNPs coated NiTi alloy samples with different coating times. Asterisk (*) represents a significant difference (p < 0.05) by Welch’s ANOVA and Game-Howell multiple comparison tests.