Resonance behavior of the defect-induced Raman mode of single-chirality enriched carbon nanotubes

Laudenbach, Jan; Hennrich, Frank; Telg, Hagen; Kappes, Manfred M.; Maultzsch, Janina

doi:10.1103/physrevb.87.165423

Cited by 15 publications

(22 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental REMs have also been shown for intermediate frequency modes (IFMs) [27,28] and RBM overtones [29]. The D band REP has been investigated for polyfluorenesorted SWCNTs [30]. REPs have also been tracked in the ultraviolet wavelength range [31].…”

Section: Introductionmentioning

confidence: 97%

Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes

Finnie

2016

Nano Res.

View full text Add to dashboard Cite

KEYWORDSsingle walled carbon nanotube (SWCNT), tunable Raman spectroscopy, purity, metallicity ABSTRACT Tunable filter Raman spectroscopy is used to efficiently produce Raman excitation maps of unpurified and type-purified single walled carbon nanotubes (SWCNTs). Maps with fine excitation resolution (1 nm) are created over a wide wavelength range (727 to 980 nm), extending from metallic to semiconducting resonances. At a given wavelength, the wide bandwidth (>3,000 cm -1 ) allows the comparison of the G band with the radial breathing mode (RBM), and shows the 2D band and other less prominent bands. Materials examined included unsorted powders, aqueous sorted semiconductors, aqueous sorted metals, and polyfluorene sorted semiconductors in toluene. The Raman excitation profiles of the G band are broad, relative to the RBM bands. The maps offer evidence of minority species contamination, except in the case of the polyfluorene sorted semiconductors. Tunable Raman spectroscopy data help validate the simpler fixed wavelength Raman spectroscopy approaches to purity assessment.

show abstract

Section: Introductionmentioning

confidence: 97%

Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes

Finnie

2016

Nano Res.

View full text Add to dashboard Cite

show abstract

“…Typically, the degree of functionalization is determined by the amplitude or intensity ratio between the D mode and the G mode [27,28] (D/G ratio). As recently shown, for an excitation in resonance with the optical transitions, the D-mode intensity is strongly enhanced [29]. A still open question is how the resonance behavior of the D mode influences the D/G ratio in SWCNTs ensembles, typically used for applications.…”

Section: Introductionmentioning

confidence: 99%

“…consists of two Lorentzians [29]. This leads to up to four contributions for the 2D mode, involving only three optical transitions.…”

mentioning

confidence: 99%

See 1 more Smart Citation

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

Laudenbach

Schmid

Herziger

et al. 2017

Carbon

Self Cite

View full text Add to dashboard Cite

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

show abstract

“…In contrast, semiconducting carbon nanotubes were predicted to not exhibit a D mode with the same systematic excitation energy dependence of its frequency 14 . However, recent experiments on semiconducting CNT samples enriched with single chiral indices demonstrated the existence of a D mode in CNTs that do not satisfy the aforementioned restriction 16 . Furthermore, there is an ongoing discussion about the dependence of the D-mode frequency in CNTs on the tube diameter and the transition energy.…”

Section: Introductionmentioning

confidence: 99%

Understanding double-resonant Raman scattering in chiral carbon nanotubes: Diameter and energy dependence of theDmode

et al. 2015

Self Cite

View full text Add to dashboard Cite

We present a theoretical model to describe the double-resonant scattering process in arbitrary carbon nanotubes. We use this approach to investigate the defect-induced D mode in CNTs and unravel the dependence of the D-mode frequency on the CNT diameter and on the energy of the resonant optical transition. Our approach is based on the symmetry of the hexagonal lattice and geometric considerations, hence the method is independent of the exact model that is chosen to describe the electronic band structure or the phonon dispersion. We finally clarify the diameter dependence of this Raman mode that was controversely discussed in the past and demonstrate that, depending on the experimental conditions, in general two different dependencies can be measured. We also prove that carbon nanotubes with arbitrary chiral index can exhibit a D mode in their Raman spectrum, in contrast to previous symmetry-based arguments. Furthermore, we give a direct quantification of the curvature-induced phonon frequency corrections of the D-mode in carbon nanotubes with respect to graphite.

show abstract

Resonance behavior of the defect-induced Raman mode of single-chirality enriched carbon nanotubes

Cited by 15 publications

References 35 publications

Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes

Tunable filter Raman spectroscopy of purified semiconducting and metallic carbon nanotubes

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

Understanding double-resonant Raman scattering in chiral carbon nanotubes: Diameter and energy dependence of theDmode

Contact Info

Product

Resources

About