Open AccessEFFECT OF HIGH-PRESSURE ANNEALING ON MICROSTRUCTURAL TRANSFORMATION OF NANOTUBES
Author(s) -
Ming Zhang,
Dahai He,
Xu Ying-Fan,
Wenkui Wang,
Liang Ji,
Wei Bingqing,
Wu De-Hai
Publication year - 1998
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.47.270
Subject(s) - materials science , annealing (glass) , carbon nanotube , transmission electron microscopy , microstructure , mechanical properties of carbon nanotubes , ribbon , composite material , chemical engineering , spheres , nanotechnology , nanotube , physics , engineering , astronomy
The microstructural transformations of carbon nanotubes under high-pressure annealing have been studied by high resolution transmission electron microscopy. It is found that under 5.5GPa the microstructure of nanotubes has obviously changed at an annealing temperature of 770℃, while onion-like and ribbon-like structures formed at 950℃. The transformation from carbon nanotubes into quasi-spherical onion occurs in several steps, first the shells of nanotubes collapse, then spheres form and finally onion-like structures appear. The effects of high pressure and annealing temperature on microstructural changes are discussed.