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Laser heating method for estimation of carbon nanotube purity
Laser heating method for estimation of carbon nanotube purity
- 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