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Laser heating method for estimation of carbon nanotube purity

Laser heating method for estimation of carbon nanotube purity

Authors :
Anatoly S. Lobach
Elena D. Obraztsova
S. V. Terekhov
Vitali I. Konov
Source :
Applied Physics A: Materials Science & Processing. 74:393-396
Publication Year :
2002
Publisher :
Springer Science and Business Media LLC, 2002.

Abstract

A new method of a carbon nanotube purity estimation has been developed on the basis of Raman spectroscopy. The spectra of carbon soot containing different amounts of nanotubes were registered under heating from a probing laser beam with a step-by-step increased power density. The material temperature in the laser spot was estimated from a position of the tangential Raman mode demonstrating a linear thermal shift (-0.012 cm-1/K) from the position 1592 cm-1 (at room temperature). The rate of the material temperature rise versus the laser power density (determining the slope of a corresponding graph) appeared to correlate strongly with the nanotube content in the soot. The influence of the experimental conditions on the slope value has been excluded via a simultaneous measurement of a reference sample with a high nanotube content (95 vol. %). After the calibration (done by a comparison of the Raman and the transmission electron microscopy data for the nanotube percentage in the same samples) the Raman-based method is able to provide a quantitative purity estimation for any nanotube-containing material.

Details

ISSN :
14320630 and 09478396
Volume :
74
Database :
OpenAIRE
Journal :
Applied Physics A: Materials Science & Processing
Accession number :
edsair.doi...........9653dd56199a72ee5281608b825b84e6
Full Text :
https://doi.org/10.1007/s003390201285