Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4854
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Title: Formation of sp³ bonding in nanoindented carbon nanotubes and graphite
Authors: Guo, W
Zhu, CZ
Yu, TX
Woo, CH 
Zhang, B
Dai, YT
Issue Date: 10-Dec-2004
Source: Physical review letters, 10 Dec. 2004, v. 93, no. 24, 245502, p. 1-4
Abstract: Nanoindentation-induced interlayer bond switching and phase transformation in carbon nanotubes (CNTs) and graphite are simulated by molecular dynamics. Both graphite and CNTs experience a soft-to-hard phase transformation at room temperature at compressive stresses of 12 and 16 GPa, respectively. Further penetration leads to the formation of interlayer sp³ bonds, which are reversible upon unloading if the compressive stress is under about 70 GPa, beyond which permanent interlayer sp³ bonds form. During nanoindentation, the maximum nanohardness of graphite can reach 109 GPa, and CNTs 120 GPa, which is comparable to that of diamond.
Keywords: Bonding
Boundary conditions
Carbon nanotubes
Compressive strength
Compressive stress
Diamonds
Electric resistance
Graphite
Hardness
Indentation
Molecular dynamics
Phase transitions
Pressure effects
Raman scattering
Single crystals
Publisher: American Physical Society
Journal: Physical review letters 
ISSN: 0031-9007
EISSN: 1079-7114
DOI: 10.1103/PhysRevLett.93.245502
Rights: Physical Review Letters © 2004 The American Physical Society. The Journal's web site is located at http://prl.aps.org/
Appears in Collections:Journal/Magazine Article

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