Effects of Irradiation on the Graphite Density of States Analyzed by Photoelectron Spectroscopy

Speranza, G.; Minati, L.

doi:10.1021/jp803941q

Cited by 2 publications

(2 citation statements)

References 59 publications

(95 reference statements)

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“…This leads to the formation of a large number of heptagon and/or pentagon rings. In addition, in a previous paper we showed that the valence band spectrum of 40 min Ar + sputtered graphite displayed an increase of signal in the region near the Fermi energy with respect to that of the pristine high oriented pyrolitic graphite . The presence of these states near the Fermi level does not induce an increase of the conductive properties of the carbon nanotubes.…”

Section: Resultsmentioning

confidence: 69%

Investigation on the Electronic and Optical Properties of Short Oxidized Multiwalled Carbon Nanotubes

et al. 2010

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Oxidized multiwalled carbon nanotubes were produced by strong acid treatment with the aid of sonication. Short-length carbon nanotubes obtained by filtration of the oxidized carbon nanotubes were analyzed by means of X-ray photoelectron spectroscopy, Raman and photoluminescence spectroscopies, and scanning electron microscopy. Direct evidence of the modifications of the electronic properties of the carbon nanotubes was obtained by the valence band analysis. The oxidation induced by the acid treatment led to deep changes of the carbon nanotubes density of states. Analysis of the photoluminescence spectra showed that the short carbon nanotubes are luminescent in the visible range. Interestingly, the spectral intensities and lineshapes are strongly dependent on the pH of the CNT solution. This effect is explained by a modification of the local environment of the defects induced by the protonation/deprotonation of the carboxylic groups formed by the oxidation process.

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Section: Resultsmentioning

confidence: 69%

Investigation on the Electronic and Optical Properties of Short Oxidized Multiwalled Carbon Nanotubes

et al. 2010

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“…The energy dispersion characteristics are reflected in the DOS. 55 The DOS is very useful for understanding the essential properties, such as optical and transport properties, and electronic excitations. In Fig.…”

Section: Density Of Statesmentioning

confidence: 99%

Low-frequency electronic and optical properties of rhombohedral graphite

Chiu

Huang

Chen

et al. 2011

Phys. Chem. Chem. Phys.

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Low-energy electronic and optical properties of ABC-stacked graphite are respectively studied by the tight-binding model and gradient approximation. The band structures include linear and parabolic bands with and without degeneracy. They show strongly anisotropic dispersions. ABC-stacked graphite is a semimetal due to the slight overlap near the Fermi level between the conduction and valence bands. The interlayer interactions change the energy dispersion, state degeneracy, and the positions of band-crossings and band-edge states. When the state energy is higher than the degenerate energy of the conduction band (E(2d)(c)) or lower than that of the valence bands (E(2d)(v)), a greater number of states might exist. The special band structures would be reflected in the density of states (DOS), the joint density of states (JDOS), and the absorption spectra (A(ω)). For example, the DOS exhibits a cave-like structure at ω = E(2d)(c) and E(2d)(v). Both a special jump in the JDOS and a turning point in the A(ω) occur at ω = E(2d)(c) - E(2d)(v). The DOS and A(ω) could be respectively verified by scanning tunneling spectroscopy and optical absorption spectroscopy.

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Effects of Irradiation on the Graphite Density of States Analyzed by Photoelectron Spectroscopy

Cited by 2 publications

References 59 publications

Investigation on the Electronic and Optical Properties of Short Oxidized Multiwalled Carbon Nanotubes

Investigation on the Electronic and Optical Properties of Short Oxidized Multiwalled Carbon Nanotubes

Low-frequency electronic and optical properties of rhombohedral graphite

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