Electronic Structure and Optical Limiting Behavior of Carbon Nanotubes

Chen, Ping; Wu, Xiao; Sun, Xiaoming; Lin, Jiunn Yuan; Ji, Wei; Tan, K. L.

doi:10.1103/physrevlett.82.2548

Cited by 403 publications

(260 citation statements)

References 17 publications

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“…This broad band results from σ +π excitations and is centred around 27.0 eV for samples prepared with wall temperatures of 100 and 80 • C and at a slightly lower energy of ∼25 eV for T wall = 60 • C. These loss features are typical of graphite-like structures, like carbon nanotubes [32][33][34]. Peaks at ∼6 eV are attributed to π -π* collective excitations.…”

Section: Xps Analysismentioning

confidence: 97%

Microwave plasmas applied for the synthesis of free standing graphene sheets

Tatarova¹,

Dias²,

Henriques³

et al. 2014

J. Phys. D: Appl. Phys.

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Self-standing graphene sheets were synthesized using microwave plasmas driven by surface waves at 2.45 GHz stimulating frequency and atmospheric pressure. The method is based on injecting ethanol molecules through a microwave argon plasma environment, where decomposition of ethanol molecules takes place. The evolution of the ethanol decomposition was studied in situ by plasma emission spectroscopy. Free gas-phase carbon atoms created in the plasma diffuse into colder zones, both in radial and axial directions, and aggregate into solid carbon nuclei. The main part of the solid carbon is gradually withdrawn from the hot region of the plasma in the outlet plasma stream where nanostructures assemble and grow. Externally forced heating in the assembly zone of the plasma reactor has been applied to engineer the structural qualities of the assembled nanostructures. The synthesized graphene sheets have been analysed by Raman spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy and x-ray photoelectron spectroscopy. The presence of sp 3 carbons is reduced by increasing the gas temperature in the assembly zone of the plasma reactor. As a general trend, the number of mono-layers decreases when the wall temperature increases from 60 to 100 • C. The synthesized graphene sheets are stable and highly ordered.

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Section: Xps Analysismentioning

confidence: 97%

Microwave plasmas applied for the synthesis of free standing graphene sheets

Tatarova¹,

Dias²,

Henriques³

et al. 2014

J. Phys. D: Appl. Phys.

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show abstract

“…Au has a work function of ϳ5.3 eV, whereas nanotubes were found to have a work function of about 4.3 eV. 24,25 The aligning of the Fermi levels by transfer of electrons from nanotube to gold leads to an asymmetric position of the nanotube band structure relative to the Fermi level. From the STS spectra we find that ‫ץ‬E is about 0.3Ϯ0.1 eV for both metallic and semiconducting nanotubes, independent of ⌬E gap and ⌬E sub .…”

Section: Long Nanotubesmentioning

confidence: 99%

Spatially resolved scanning tunneling spectroscopy on single-walled carbon nanotubes

et al. 2000

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Scanning tunneling microscope spectroscopy is used to study in detail the electronic band structure of carbon nanotubes as well as to locally investigate electronic features of interesting topological sites such as nanotube ends and bends. From a large number of measurements of the tunneling density-of-states ͑DOS͒ nanotubes can be classified, according to predictions, as either semiconducting ͑two-third of the total number of tubes͒ or metallic ͑one-third͒. The energy subband separations in the tunneling DOS compare reasonably well to theoretical calculations. At nanotube ends, spatially resolved spectra show additional sharp conductance peaks that shift in energy as a function of position. Spectroscopy measurements on a nanotube kink suggest that the kink is a heterojunction between a semiconducting and a metallic nanotube.

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“…23 Chen et al observed that the optical transmission in CNTs in ethanol at 532 and 1064 nm is reduced for smaller power levels than for carbon black in distilled water. 24 This has been attributed to stronger plasma excitations for carbon nanotubes. The optical absorption of CNT and graphite in the considered wavelength interval ͑640-480 nm͒ is similar and increases monotonously with decreasing wavelength.…”

mentioning

confidence: 99%