349453.fig.004a
(a)
349453.fig.004b
(b)
349453.fig.004c
(c)
Figure 4: SEM images showing (a) before and (b) after mechanical failure caused by repeated compression. The AFM image (and sectional analysis) of one of the nanotubes that was found after fracture is shown in (c). The image was acquired in intermittent contact mode using the same tip from which it was detached.