Optical properties of semiconducting and metallic single wall carbon nanotubes: effects of doping and high pressure

Minami, Nobutsugu; Kazaoui, Saïd; Jacquemin, R.; Yamawaki, Hisashi; Aoki, Katsunori; Kataura, Hiromichi; Achiba, Y.

doi:10.1016/s0379-6779(00)00447-1

Cited by 42 publications

(36 citation statements)

References 19 publications

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“…In the far-IR range, a Lorentzian-like absorption feature at $17 meV has been observed in the reflectance spectrum of SWCNTs [216]. This peak was interpreted to originate from the pseudo-gap in armchair tubes introduced by bundling, or the curvature-induced secondary gap in zigzag or chiral metallic tubes [217]. Signatures of such an energy gap have also been detected by far-IR transmission spectroscopy on SWCNT thin films [218].…”

Section: Optical Absorption and Emission Spectroscopymentioning

confidence: 86%

“…As expected, with rising doping level the transition bands sequentially disappear in the order of increasing energy, that is S 11 , S 22 , and M 11 . The emergence of a new absorption band around $1.2 eV at highest acceptor (donor) doping levels has been tentatively assigned to intraband transitions between vHs within the valence (conduction) band of the metallic tubes in the samples [217,594].…”

Section: Electronic Structurementioning

confidence: 97%

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Electronic and vibrational properties of chemically modified single-wall carbon nanotubes

Burghard

2005

Surface Science Reports

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Section: Optical Absorption and Emission Spectroscopymentioning

confidence: 86%

Section: Electronic Structurementioning

confidence: 97%

Electronic and vibrational properties of chemically modified single-wall carbon nanotubes

Burghard

2005

Surface Science Reports

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“…1 The behavior of single-walled carbon nanotubes ͑SWCNT͒ under high hydrostatic pressure has been the focus of a number of theoretical 2-6 as well as experimental [7][8][9][10][11][12][13][14][15][16][17][18] investigations and has been reviewed recently. 19 Experimental investigations have employed a number of powerful techniques to elucidate the behavior of nanoscopic carbon species under high hydrostatic pressure.…”

Section: Introductionmentioning

confidence: 99%

Study of the hydrostatic pressure dependence of the Raman spectrum of single-walled carbon nanotubes and nanospheres

Amer

El-Ashry

Maguire

2004

The Journal of Chemical Physics

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We have investigated the behavior of single-walled carbon nanotubes and nanospheres (C(60)) under high hydrostatic pressure using Raman spectroscopy over the pressure range 0.2-10 GPa using a diamond anvil cell. Different liquid mixtures were used as pressure transmission fluids (PTF). Comparing the pressure dependence of the Raman peak positions for the nanotubes and the nanospheres in different PTF leads to the observation of a number of new phenomena. The observed shift in Raman peak position of both radial and tangential modes as a function of applied pressure and their dependence on the PTF chemical composition can be rationalized in terms of adsorption of molecular species from the of PTF on to the surface of the carbon nanotubes and/or nanospheres. The peak shifts are fully reversible and take place at a comparatively modest pressure (2-3 GPa) that is far below pressures that might be required to collapse the nanoparticles. Surface adsorption of molecular species on the nanotube or nanospheres provides a far more plausible rational for the observed phenomena than ideas based on the notion of tube collapse that have been put forward in the recent literature.

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“…23,24 Therefore, an apparent doping of the semiconducting SWNTs by the polymer is present. However, due to the higher intensity at larger energies, typical of absorption for the metallic SWNTs (~1.8 eV), any interaction between these SWNT types and the polymer is presently unavailable.…”

mentioning

confidence: 99%

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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Optical properties of semiconducting and metallic single wall carbon nanotubes: effects of doping and high pressure

Cited by 42 publications

References 19 publications

Electronic and vibrational properties of chemically modified single-wall carbon nanotubes

Electronic and vibrational properties of chemically modified single-wall carbon nanotubes

Study of the hydrostatic pressure dependence of the Raman spectrum of single-walled carbon nanotubes and nanospheres

Single‐wall carbon nanotube–polymer solar cells

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