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Crystalline Quality Evaluation of Carbon Nanotubes by Kinetic Analysis in Quasi‐Isothermal Conditions
Author(s) -
Lanza Maurizio,
Santangelo Saveria,
Messina Giacomo,
Galvagno Signorino,
Milone Candida
Publication year - 2010
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200900996
Subject(s) - kinetic energy , isothermal process , raman spectroscopy , carbon nanotube , activation energy , materials science , analytical chemistry (journal) , intensity (physics) , derivative (finance) , carbon fibers , chemistry , thermodynamics , chemical engineering , nanotechnology , organic chemistry , optics , composite material , physics , engineering , quantum mechanics , composite number , financial economics , economics
We demonstrate that the crystalline quality of multi‐walled carbon nanotubes (MWCNTs) is better estimated by the apparent activation energy of the oxidation reaction, obtained by kinetic analysis in quasi‐isothermal conditions, than by the peak‐temperature position in the derivative mass loss curves. This is proven by the existence of a good correlation, reported for the first time herein, between apparent activation energy and G′‐band to D‐band intensity ratio derived from micro‐Raman spectroscopy, which is largely accepted as an indicator of the overall MWCNT crystalline quality. In contrast, no clear reliance is found between G′/D intensity ratio and the peak‐temperature position in the derivative mass loss curves. These conclusions were drawn after investigation of a large number of commercially available and laboratory prepared MWCNTs.