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Effects of Tip-Nanotube Interactions on Atomic Force Microscopy Imaging of Carbon Nanotubes

We examine the effect of van der Waals (vdW) interactions between atomic force microscope (AFM) tips and individual carbon nanotubes (CNTs) supported on SiO2. Molecular dynamics (MD) simulations reveal how CNTs deform during AFM measurement, irrespective of the AFM tip material. The apparent height of a single- (double-) walled CNT can be used to estimate its diameter up to ~2 nm (~3 nm), but for larger diameters the CNT cross-section is no longer circular. Our simulations were compared against CNT dimensions obtained from AFM measurements and resonant Raman spectroscopy, with good agreement for the smaller CNT di-ameters. In general, AFM measurements of large-diameter CNTs must be interpreted with care, but the reliability of the approach is improved if knowledge of the number of CNT walls is avail-able, or if additional verification (e.g. by optical techniques) can be obtained.

preprint2012arXivOpen access
Rouholla AlizadeganAlbert D. LiaoFeng XiongEric PopK. Jimmy Hsia
cond-mat.mes-hallcond-mat.mtrl-sci
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Rouholla AlizadeganAlbert D. LiaoFeng XiongEric PopK. Jimmy Hsia

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