In Figure 2(d), the appearance structure formed by 7.5% SIO is the most flat and dense, almost completely covering the surface of the material, with only a few holes
Figure 2 (d) shows that 7.5% of SIO's exterior structure is the smoothest and densest, covering almost completely the surface of the material with only a small number of holes.
In Fig. 2 (d), the surface structure formed by 7.5% SiO is the most flat and dense, covering almost the surface of the material with only a few holes<br>