Journal
DIAMOND AND RELATED MATERIALS
Volume 25, Issue -, Pages 24-28Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2012.01.029
Keywords
Structural improvement; CVD carbon nanotubes; Rapid annealing; Structural analysis
Categories
Funding
- National Natural Science Foundation of China [50730008]
- Shanghai Science and Technology Grant [1052nm02000, 09JC1407400]
- Natural Science Foundation of Shanghai [10ZR1416300]
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Generally, due to structural disorders in multi-walled carbon nanotubes (MWCNTs) synthesized by chemical vapor deposition (CVD), most of their properties are much below the expected values. A novel technique has been developed in this investigation for structural improvement of CVD MWCNTs using a rapid annealing process. Direct observation by transmission electron microscope (TEM) indicates obvious structural changes in the nanotubes after a rapid annealing process between 2000 degrees C and 2800 degrees C, while nanotubes with twisty shells and kinked walls have been observed as the annealing temperature approaches 3000 degrees C. Decrease of I-D/I-G ratio in Raman spectra, increase of the starting oxidation temperature observed in Thermogravimetric analysis (TGA), as well as increase in electrical conductivity of nanotube powders suggests the reconstruction toward more ordered nanotube structure after a rapid high temperature annealing process. (C) 2012 Elsevier B.V. All rights reserved.
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