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.

Crystalline quality evaluation in carbon nanotubes by kinetic analysis in quasi-isothermal conditions

SANTANGELO S;MESSINA G;
2010

Abstract

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12318/2776
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