Abstract
Using the AFM tip, nanotubes are caught on a raw sample then deposited on a clean surface with an absolute precision better than 500nm. A nanostructured surface made of smooth Germanium dots on flat silicon was used as deposition sample. Nanotube mechanics is probed by AFM tip induced displacement. Nanotubes are shown to be blocked by Ge dots: it is impossible to induce a controlled displacement of the nanotube over a Ge dot when it is pushed against the dot. Elastic energy due to the bending of the nanotube is at the root of that behavior.
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I = π(D2 − D1)4 / 64 where D2 and D1 are respectively the external and internal diameter of the CNT estimated from TEM measurement to be around 25nm and 10nm. We used E = 1TPa and R0 = ∞. R, the local radius of curvature of the bent CNT is chosen to be constant and equal to 675 nm (that is the radius of curvature of a Ge dot). The distance z along which the nanotube is bent is calculated to be around 515 nm.
U = Flat × d. Flat is the lateral force and d is the displacement of the tip (equal to 50nm, the height of the dot).
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Decossas, S., Patrone, L., Comin, F. et al. Mechanics of multi walled Carbon nanotubes probed by AFM. MRS Online Proceedings Library 675, 421 (2001). https://doi.org/10.1557/PROC-675-W4.2.1
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DOI: https://doi.org/10.1557/PROC-675-W4.2.1