Yap et al. Nanoscale Research Letters 2012, 7:105 http://www.nanoscalereslett.com/content/7/1/105 Page 6 of 8 Figure 5 SEM images of the CNT bumps’ morphology after top die removal. (a) CNT bumps on the carrier. (b) CNT bumps on the chip joined to the carrier bump in (a). (c) Magnified view of the bump. The vertical alignments of the CNTs are indications of the mechanical flexibility of CNTs. 25 μm, and RCNT scales with the length above the m.f.p. [3]. The length of our MWCNTs is less than the m.f.p. and does not account for the differences in the CNT bump resistances as seen across various devices (not shown). As such, the only possible reason for the mea- sured resistance is likely to be cause by RCNT/CNT. RCNT/CNT is affected by the chirality of CNTs, the inter- face area, the gap between CNTs, and the interface imper- fections [21,22]. It is now common knowledge that the properties of the CNTs within the CNT bump cannot be identical and that each CNT varies in terms of diameters and chirality. However, the work functions for CNTs are