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Controlling the Crystalline Quality and the Purity of Single-walled Carbon Nanotubes Grown by Catalytic Chemical Vapor Deposition

Published online by Cambridge University Press:  18 March 2013

Hugo Navas
Affiliation:
Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France
Matthieu Picher
Affiliation:
Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France
Raul Arenal
Affiliation:
Laboratoire d’Etude des Microstructures, UMR 104 CNRS-ONERA, 29 av. de la Division Leclerc, 92322 Châtillon, France Laboratorio de Microscopias Avanzadas (LMA), Instituto de Nanociencia de Aragon (INA), U. Zaragoza, C/ Mariano Esquillor s/n, 50018 Zaragoza, Spain Fundacion ARAID, 50004 Zaragoza, Spain
Etienne Quesnel
Affiliation:
CEA-LITEN, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
Eric Anglaret
Affiliation:
Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France
Vincent Jourdain
Affiliation:
Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France CNRS, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier, France
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Abstract

It is frequently observed that as-grown single-walled carbon nanotubes (SWCNTs) contain defects. Controlling the defect density is a key issue for the control of nanotube properties. However, little is known about the influence of the growth conditions on the formation of nanotube defects. In addition, SWCNT samples frequently contain carbonaceous by-products which affect their ensemble properties. Raman spectroscopy is commonly used to characterize both features from the measurement of the defect-induced D band. However, the contribution of each carbonaceous species to the D band is usually not known making it difficult to separately extract the defect density and relative abundance of each. Here, we report on the correlated evolution of the D and G’ bands of SWCNT samples with increasing growth temperature. In the general case, three to four Lorentzian components are required to fit them. Coupled with HRTEM characterization, the low frequency components of the D and G’ can be attributed to the contribution of SWCNTs while high frequency components are associated with defective carbonaceous by-products. The nature of these defective by-products varies with the type of catalysts and with the growth conditions.

Type
Articles
Copyright
Copyright © Materials Research Society 2013

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References

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