Effect of Source, Surfactant, and Deposition Process on Electronic Properties of Nanotube Arrays
Figure 5
Nanotubes (Cheap Tubes) deposited on Si wafers at 2 MHz (Figures 5(a), 5(b)) and 25 MHz (Figures 5(c), 5(d)). The difference in their alignment is apparent. Figure 5(d) represents deposited nanotubes (at 25 MHz) shorter in length (<2 μm); it can be seen that even shorter nanotubes were amazingly aligned in the gap. Figures 5(e), 5(f) show nanotubes deposited from a solution that was sonicated for a short time (5 min) and then left standing for a few days prior to use; formation of bigger bundles of nanotubes is apparent in the images.
