Formation of sp³ bonding in nanoindented carbon nanotubes and graphite

Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/4854

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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