Resonant Raman study of the structure and electronic properties of single-wall carbon nanotubes

Alvarez, Laurent; Righi, A.; Guillard, T.; Rols, S.; Anglaret, Éric; Laplaze, D.; Sauvajol, Jean‐Louis

doi:10.1016/s0009-2614(99)01291-9

Cited by 226 publications

(149 citation statements)

References 16 publications

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“…The exciting photons (energies 2.41 eV or 2.54 eV) resonate with the transition (v s 3 3c s 3 ) in tubes of diameters 1.2 ± 1.5 nm. [17,29,30] The overall intensities of the RBM and TM modes decrease as a result of both cathodic and anodic charging in ionic liquid (Figure 4 and (5)), which matches the behavior in aqueous [20,39,40] and aprotic [8,12,21] electrolyte solutions. By comparing Figure 4 with Figure 6 and Figure 5 with Figure 7, the tube-related modes in peapods show a similar response to electrochemical charging as those of empty tubes.…”

Section: Raman Spectroscopysupporting

confidence: 70%

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: Raman Spectroscopysupporting

confidence: 70%

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

Kavan

Dunsch

2003

ChemPhysChem

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“…This mode was first observed in carbon nanotubes, corresponding to the atomic vibration of the carbon atoms in the radial direction. Its frequency was found to be highly dependent on the nanotubes diameter (Alvarez et al, 2000;Jorio et al, 2003;Maultzsch et al, 2005). The same mode has been observed even in semiconductor nanowires (Thonhauser & Mahan, 2005;Lange et al, 2008), and in both cases the inverse dependence on the nanowire diameter has been found.…”

Section: Appearance Of New Modes: Surface and Breathing Modessupporting

confidence: 69%

Raman Spectroscopy on Semiconductor Nanowires

Zardo¹,

Abstreiter²,

Morral³

2010

Nanowires

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“…semiconducting vs. metallic. 20,21 For this diameter range, the 1.96 eV laser resonantly enhances predominantly metallic SWNTs which correspond to ~1.2-1.4 nm in diameter. 19 Similarly, the 2.55 eV laser probes the semiconducting type, also shown to contain equivalent diameters for the purified sample.…”

Section: Resultsmentioning

confidence: 96%

Single‐wall carbon nanotube–polymer solar cells

Landi

Raffaelle

Castro

et al. 2005

Progress in Photovoltaics

246

141

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Investigation of single wall carbon nanotube (SWNT)-polymer solar cells has been conducted towards developing alternative lightweight, flexible devices for space power applications. Photovoltaic devices were constructed with regioregular poly(3-octylthiophene)-(P3OT) and purified, >95% w/w, laser-generated SWNTs. The P3OT composites were deposited on ITO-coated polyethylene terapthalate (PET) and I-V characterization was performed under simulated AM0 illumination. Fabricated devices for the 1.0% w/w SWNT-P3OT composites showed a photoresponse with an opencircuit voltage (V oc ) of 0.98 V and a short-circuit current density (I sc ) of 0.12 mA/cm 2 . Optimization of carrier transport within these novel photovoltaic systems is proposed, specifically development of nanostructure-SWNT complexes to enhance exciton dissociation.

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Resonant Raman study of the structure and electronic properties of single-wall carbon nanotubes

Cited by 226 publications

References 16 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

Raman Spectroscopy on Semiconductor Nanowires

Single‐wall carbon nanotube–polymer solar cells

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