Closed-edged graphene nanoribbons from large-diameter collapsed nanotubes.
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 ε = 54 meV/pair to calculate the carbon-carbon van der Waals interaction.
Department of Chemistry and Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston, Texas 77005, United States.
Chenguang
C
Zhang
Ksenia
K
Bets
Seung Soo
SS
Lee
Zhengzong
Z
Sun
Francesca
F
Mirri
Vicki L
VL
Colvin
Boris I
BI
Yakobson
James M
JM
Tour
Robert H
RH
Hauge