Figure 3
How morphology, surface elements and wettability changed when 60 V etching voltage was applied. SEM images and magnified SEM images of dimples that were electrochemically etched at 60 V for (a,e) 10, (b,f) 30, (c,g) 60 and (d,h) 120 seconds, respectively. EDS spectrums of the isolated area in the dimples after (i) 30 and (j) 60 seconds etching. (k) CAs of 5 μL water droplets in the dimples that were etched at 60 V for different times.
