期刊
ACS NANO
卷 6, 期 7, 页码 6023-6032出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn301039v
关键词
collapsed nanotube; graphene nanoribbon; single-walled carbon nanotubes; double-walled carbon nanotubes; aluminum-iron oxide nanoparticles; molecular dynamics simulation; carbon-carbon van der Waals interaction
类别
资金
- China Scholarship Council
- Lockheed Martin
- NSF [EEC-0647452, UTA/AEC BEG08-011]
- ONR MURI [00006766, N00014-09-1-1066]
- Air Force Research Laboratory [FA8650-07-2-5061]
The diameter dependence of the collapse of single- and double-walled carbon nanotubes to two- and four-walled graphene nanoribbons with closed edges (CE(x)GNRs) has been experimentally determined and compared to theory. TEM and AFM were used to characterize nanotubes grown from preformed 4.0 nm diameter aluminum-iron oxide particles. Experimental data indicate that the energy equivalence point (the diameter at which the energy of a round and fully collapsed nanotube is the same) is 2.6 and 4.0 nm for single- and double-walled carbon nanotubes, respectively. Molecular dynamics simulations predict similar energy equivalence diameters with the use of epsilon = 54 meV/pair to calculate the carbon-carbon van der Waals interaction.
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