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Application of the G'/D Raman Ratio for Purity Assessment of Multi-Walled Carbon Nanotubes

Published online by Cambridge University Press:  01 February 2011

Roberta DiLeo ,
Brian Landi  and
Ryne Raffaelle
Roberta DiLeo
Affiliation:
[email protected], Rochester Institute of Technology, Physics, 85 Lomb Memorial Drive, Rochester, NY, 14623, United States
Brian Landi
Affiliation:
[email protected], Rochester Institute of Technology, Physics, 85 Lomb Memorial Drive, Rochester, NY, 14623, United States
Ryne Raffaelle
Affiliation:
[email protected], Rochester Institute of Technology, Physics, 85 Lomb Memorial Drive, Rochester, NY, 14623, United States
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Abstract

Carbonaceous purity assessment methods are being sought after for all types of carbon nanotubes as a means to standardize the material metrology. Our most recent work has evaluated chemical vapor synthesized multi-walled carbon nanotubes (MWNTs). This effort included a protocol for assessment involving qualitative information from scanning electron microscopy (SEM) images and quantitative information from thermogravimetric analysis (TGA) and Raman spectroscopy. Presently, the analysis using Raman spectroscopy on a constructed sample set has been extended to a second excitation energy (HeNe laser at 1.96 eV) and the similar trends in the relative Raman peak ratios have been measured. In contrast to the G-band, the D and G' peaks demonstrate a Raman shift that is excitation energy-dependent, consistent with the double resonance theory. However, the Raman ratio of IG'/ID is independent of excitation energy and is observed to be the most sensitive to MWNT carbonaceous purity. Application of this approach to MWNT arrays grown on SiO2 is compared to conventional bulk powders synthesized under similar conditions. The MWNT arrays show a high degree of vertical alignment based upon SEM and a measured carbonaceous purity using the IG'/ID ratio of 75% w/w.

Keywords

Raman spectroscopyCchemical vapor deposition (CVD) (deposition)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1018: Symposium EE – Applications of Nanotubes and Nanowires , 2007 , 1018-EE05-11
Copyright
Copyright © Materials Research Society 2007

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