Research Article

The Effects of Power Levels/Time Periods for Sputtering Cobalt onto Carbon Nanotubes/Graphene Composites and Cobalt Annealed on the Characteristics of Anode Materials for Lithium-Ion Batteries

Figure 10

AFM micrograph of cobalt oxide/carbon nanotubes/graphene composites with different power levels and time periods (a) 50 W and 30 min, (b) 50 W and 45 min, (c) 50 W and 60 min, (d) 100 W and 30 min, (e) 100 W and 45 min (f) 100 W and 60 min, (g) 150 W and 30 min, (h) 150 W and 45 min, and (i) 150 W and 60 min for sputtering cobalt onto carbon nanotube/graphene composite.
(a) rms = 11.6 nm
(b) rms = 40.7 nm
(c) rms = 51.6 nm
(d) rms = 17.5 nm
(e) rms = 42.4 nm
(f) rms = 53.2 nm
(g) rms = 5.77 nm
(h) rms = 19.4 nm
(i) rms = 41.1 nm