Figure 8: (a), (b), and (c) are SEM images, and (d) is the optical image. The images in the top row were taken prior to sonication, and those in the bottom row were taken after the test. (a) is the T-CVD sample. (b) is the MPE-CVD sample. (c) is the FCT-CVD sample, and (d) is taken from MPE-CVD Sample. There were no visual changes seen after the sonication test for the T-CVD and the FCT-CVD sample. Therefore, the before image from (d), can also be used to represent before and after sonication test for T-CVD and FCT-CVD sample.