In situ Raman and Vis-NIR spectroelectrochemistry at single-walled carbon nanotubes

Kavan, Ladislav; Rapta, Peter; Dunsch, Lothar

doi:10.1016/s0009-2614(00)00940-4

Cited by 107 publications

(145 citation statements)

References 13 publications

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“…In both cases, the optical bands disappear in the same sequence. [8,9,12,20] A complete quenching of the v s 1 3c s 1 transition (at 0.65 eV) occurs above about 1 V (Figure 2). Hence, the v s 1 3c s 1 transition is bleached at considerably larger potentials than expected from a simple model of depletion/filling of Van Hove singularities (AE 0.325 V).…”

Section: Cyclic Voltammetrymentioning

confidence: 96%

“…A similar effect was reported for SWCNT and peapods in a ™classical∫ electrochemical environment. [8,9,12,20] The second transition (v s 2 3c s 2 ) is quenched between 1.25 to 1.45 V, but there is a parallel rise of a new band, of which the peak is moving from 1.1 to 1.3 eV with increasing anodic potential. This band can be assigned to doping-induced transitions within the partly-filled valence band (v s n 3v s 1 , v s n 3v s 2 ; nx3).…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

“…Upon electrochemical charging, the SWCNTs exhibit reversible bleaching of optical transitions between the singularities. [8,20] This also causes reversible quenching of resonance Raman scattering of both the radial breathing mode (RBM) and the tangential displacement mode (TM) of SWCNT. [8,11,20,21] Analogous effects can be traced in the tube-related parts of optical and Raman spectra of C 60 @SWCNT (peapods).…”

Section: Introductionmentioning

confidence: 99%

“…[8,20] This also causes reversible quenching of resonance Raman scattering of both the radial breathing mode (RBM) and the tangential displacement mode (TM) of SWCNT. [8,11,20,21] Analogous effects can be traced in the tube-related parts of optical and Raman spectra of C 60 @SWCNT (peapods). [12] The C 60 -related Raman modes in peapods show a peculiar asymmetric increase of Raman intensities at larger anodic potentials.…”

Section: Introductionmentioning

confidence: 99%

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Ionic Liquid for in situ Vis/NIR and Raman Spectroelectrochemistry: Doping of Carbon Nanostructures

Kavan

Dunsch

2003

ChemPhysChem

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1-butyl-3-methylimidazolium tetrafluoroborate (an ionic liquid) is an advantageous electrolyte for the study of charge-transfer reactions at single-walled carbon nanotubes (SWCNTs) and fullerene peapods (C 60 @SWCNT). Compared to traditional electrolyte solutions, this medium offers a broader window of electrochemical potentials to be applied, and favorable optical properties for in situ Vis/NIR and Raman spectroelectrochemistry of nano-carbon species. The electrochemistry of both nanotubes and peapods is dominated by their capacitive double-layer charging. Vis/NIR spectroelectrochemistry confirms the charging-induced bleaching of transitions between Van Hove singularities. At high positive potentials, new optical transitions were activated in partly filled valence band. The bleaching of optical transitions is mirrored by the quenching of resonance Raman scattering in the region of tube-related modes. The Raman frequency of the tangential displacement mode of SWCNT shifts to blue upon both anodic and cathodic charging in the ionic liquid. The Raman modes of intratubular C 60 exhibit a considerable intensity increase upon anodic doping of peapods.

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Section: Cyclic Voltammetrymentioning

confidence: 96%

Section: Cyclic Voltammetrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ionic Liquid for in situ Vis/NIR and Raman Spectroelectrochemistry: Doping of Carbon Nanostructures

Kavan

Dunsch

2003

ChemPhysChem

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“…The bleaching of SWCNT modes during charging is in agreement with previously published results. [10,28] The electrochemical doping leads to a shift of the Fermi level. Thus, the Van Hove singularities are filled/depleted upon cathodic/anodic charging.…”

Section: Resultsmentioning

confidence: 99%

Sexithiophene Encapsulated in a Single‐Walled Carbon Nanotube: An In Situ Raman Spectroelectrochemical Study of a Peapod Structure

Kalbáč

Kavan

Gorantla

et al. 2010

Chemistry A European J

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The interaction of single‐walled carbon nanotubes (SWCNTs) and α‐sexithiophene (6T) was studied by Raman spectroscopy and by in situ Raman spectroelectrochemistry. The encapsulation of 6T in SWCNT and its interaction causes a bleaching of its photoluminescence, and also small shifts of its Raman bands. The Raman features of the SWCNT with embedded 6T (6T‐peapods) change in both intensity and frequency compared to those of pristine SWCNT, which is a consequence of a change of the resonant condition. Electrochemical doping demonstrated that the electrode potential applied to the SWCNT wall causes changes in the embedded 6T. The effects of electrochemical charging on the Raman features of pristine SWCNT and 6T@SWCNT were compared. It is shown that the interaction of SWCNT with 6T also changes the electronic structure of SWCNT in its charged state. This change of electronic structure is demonstrated both for semiconducting and metallic tubes.

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Electrochemistry

Iurlo

Marcaccio

Paolucci

2010

Carbon Nanotubes and Related Structures

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In situ Raman and Vis-NIR spectroelectrochemistry at single-walled carbon nanotubes

Cited by 107 publications

References 13 publications

Ionic Liquid for in situ Vis/NIR and Raman Spectroelectrochemistry: Doping of Carbon Nanostructures

Ionic Liquid for in situ Vis/NIR and Raman Spectroelectrochemistry: Doping of Carbon Nanostructures

Sexithiophene Encapsulated in a Single‐Walled Carbon Nanotube: An In Situ Raman Spectroelectrochemical Study of a Peapod Structure

Electrochemistry

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