Diameter dependence of the defect-induced Raman modes in functionalized carbon nanotubes

Laudenbach J, Schmid D, Herziger F, Frank H, Kappes M, Muoth M, Haluska M, Hof F, Backes C, Hauke F, Hirsch A, Maultzsch J (2017)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2017



Book Volume: 112

Pages Range: 1-7

DOI: 10.1016/j.carbon.2016.10.065


Covalent functionalization of single-walled carbon nanotubes typically leads to an intensity increase of the defect-induced Raman mode (D mode). A large intensity ratio of the D and G modes (D/G ratio) is therefore often used as evidence for a successful functionalization. Here, we discuss the effect of the D mode resonance on the D/G ratio and compare pristine and covalently functionalized nanotubes. By resonance Raman spectroscopy we study the evolution of the lineshape and frequencies of the D and 2D modes of samples enriched with semiconducting and metallic nanotubes in comparison with the radial breathing mode. First, we experimentally demonstrate the dependence of the D- and 2D-mode frequencies on the tube diameter and derive an analytical expression for both frequencies as a function of the diameter and the optical transition. Furthermore, we demonstrate that the contribution of the D and 2D modes for small SWCNTs disappears in covalently functionalized samples due to partial destruction. In fact, this can change the measured D/G ratio significantly and has a fundamental impact on the determination of the degree of SWCNT functionalization by Raman spectroscopy. (C) 2016 Elsevier Ltd. All rights reserved.

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Laudenbach, J., Schmid, D., Herziger, F., Frank, H., Kappes, M., Muoth, M.,... Maultzsch, J. (2017). Diameter dependence of the defect-induced Raman modes in functionalized carbon nanotubes. Carbon, 112, 1-7. https://dx.doi.org/10.1016/j.carbon.2016.10.065


Laudenbach, Jan, et al. "Diameter dependence of the defect-induced Raman modes in functionalized carbon nanotubes." Carbon 112 (2017): 1-7.

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