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

• Verfasst von: Laudenbach, Jan [VerfasserIn]
• Verfasst von: Backes, Claudia [VerfasserIn]
• Titel: Diameter dependence of the defect-induced Raman modes in functionalized carbon nanotubes
• Verf.angabe: Jan Laudenbach, Daniel Schmid, Felix Herziger, Frank Hennrich, Manfred Kappes, Matthias Muoth, Miroslav Haluska, Ferdinand Hof, Claudia Backes, Frank Hauke, Andreas Hirsch, Janina Maultzsch
• Jahr des Originals: 2016
• Umfang: 7 S.
• Fussnoten: Available online 27 October 2016 ; Gesehen am 25.09.2018
• Titel Quelle: Enthalten in: Carbon
• Jahr Quelle: 2017
• Band/Heft Quelle: 112(2017), S. 1-7
• ISSN Quelle: 1873-3891
• DOI: doi:10.1016/j.carbon.2016.10.065
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1581262728

Abstract

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.