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VOLUME 81, NUMBER 7 P H Y S I C A L R E V I E W L E T T E R S 17 AUGUST 1998 Surface Reconstructions and Dimensional Changes in Single-Walled Carbon Nanotubes
 

Summary: VOLUME 81, NUMBER 7 P H Y S I C A L R E V I E W L E T T E R S 17 AUGUST 1998
Surface Reconstructions and Dimensional Changes in Single-Walled Carbon Nanotubes
P. M. Ajayan,1
V. Ravikumar,2
and J.-C. Charlier3
1
Department of Materials Science & Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590
2
GE Corporate Research & Development, General Electric Corporation, Schenectady, New York 12309
3
Université Catholique de Louvain, Unité PCPM, Place Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium
(Received 22 May 1998)
Dimensional stability is crucial to possible applications of single-walled nanotubes, as their properties
are linked to size and topology. We observe nanotubes responding to uniform atom loss, through
surface reconstruction and drastic dimensional changes. Experiments using electron irradiation evidence
nanotube diameters shrinking from 1.4 to 0.4 nm. Molecular dynamics simulations show that surface
reconstruction and size reduction occur through dangling bond saturation, forming nonhexagonal
rings and 5-7 defects in the lattice. Nonuniform atom removal results in inhomogeneous tube
deformations and local necking, and formation of linear atomic carbon chains in the nanotube body.
[S0031-9007(98)06926-9]

  

Source: Ajayan, Pulickel M. - Department of Mechanical Engineering and Materials Science, Rice University

 

Collections: Materials Science