Nanotube-substrate Interactions: Distinguishing Carbon Nanotubes by Helical Angle
2004 Award Winner
Aleksey N. Kolmogorov, The Pennsylvania State University
Vincent H. Crespi, The Pennsylvania State University
Monika H. Schleier-Smith, The MITRE Corporation
James C. Ellenbogen, The MITRE Corporation
We investigate the interaction of a carbon nanotube with a graphite substrate, using an interlayer
potential that explicitly treats the registry dependence of the interaction. We also take into account
that carbon-carbon bond-lengths in nanotubes differ slightly from those in flat graphite, so that the
naively commensurate angular orientations for the tube with respect to the substrate lattice are
destroyed. In these conditions, the interaction of a one-dimensional tube with a two-dimensional
substrate leads to an unusual registry phenomenon not visible in standard layer-on-layer growth:
the system develops favorable orientations which clearly are incommensurate.
Physical Review Letters, Vol. 92, No. 8, pp. 085503-1–085503-4.
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