Fermi-Level Lowering and the Core Exciton Spectrum of Intercalated Graphite

Mele, Eugene J.; Ritsko, John J.

doi:10.1103/physrevlett.43.68

Cited by 209 publications

(67 citation statements)

References 17 publications

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“…This is displaced around 2 eV in agreement with early work reported by Mele and Ritsko [15] and later by Ahuja et al [5]. Additionally, we show how spectral broadening of the individual electronic states is associated to the fine structure in the π * line and how they influence its line shape.…”

Section: Introductionsupporting

confidence: 92%

Computing C1<I>s</I> X-ray Absorption for Single-Walled Carbon Nanotubes with Distinct Electronic Type

Mowbray¹,

Ayala²,

Pichler³

et al. 2011

Mat Express

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The experimental data recorded for the C1s edge in X-ray absorption spectroscopy (XAS) for graphite, graphene and nanotubes, have consistently exhibited certain discrepancies when compared with theoretical calculations. A theoretical approach to estimate the energy scale normalization for the C1s shape in X-ray absorption is presented within the time dependent density functional theory and random phase approximation framework employing the loss function. The position of the σ resonance is fairly localized whereas core hole effects must be envisaged in order to have an agreement with the delocalization of the π * resonance, which is displaced by ∼2 eV. Here we report a combined experimental and theoretical approach to identify the electronic conduction band of single walled carbon nanotubes using XAS, taking into account their metallic character.

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Section: Introductionsupporting

confidence: 92%

Computing C1<I>s</I> X-ray Absorption for Single-Walled Carbon Nanotubes with Distinct Electronic Type

Mowbray¹,

Ayala²,

Pichler³

et al. 2011

Mat Express

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“…The spectrum of graphite shows the well-known Ã resonance at about 285 eV and a Ã threshold at about 291 eV. 15 For C 60 below the Ã onset at about 290 eV, several structures appear, which can be assigned to excitations into the unoccupied Ã -derived molecular states. 16 The core excitation spectra of the concentric-shell fullerenes show a broad resonance related to the Ã -derived states at about 285.2 eV, and a Ã threshold at 291 eV.…”

Section: Resultsmentioning

confidence: 94%

Electronic structure and optical properties of concentric-shell fullerenes from electron-energy-loss spectroscopy in transmission

et al. 2001

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Electronic structure and optical properties of concentric-shell fullerenes from electron energy-loss spectroscopy in transmission Pichler, T.; Knupfer, M.; Golden, M.S.; Fink, J.; Cabioc'h, T. Published in:Physical Review B Link to publication Citation for published version (APA):Pichler, T., Knupfer, M., Golden, M. S., Fink, J., & Cabioc'h, T. (2001). Electronic structure and optical properties of concentric-shell fullerenes from electron energy-loss spectroscopy in transmission. Physical Review B, 63, 155415. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 11 May 2018Electronic structure and optical properties of concentric-shell fullerenes from electron-energy-loss spectroscopy in transmission We present momentum-dependent measurements of the loss function of bulk samples of concentric-shell fullerenes using electron-energy-loss spectroscopy in transmission. It is shown that the and ϩ plasmons of these so-called carbon onions exhibit a significant momentum dependence, with a dispersion coefficient of about two-thirds of that of the corresponding plasmons in graphite. The optical properties derived from a Kramers-Kronig analysis are reminiscent of those found for polycrystalline disordered graphite. Furthermore, we find no changes of the electronic properties by alternating the average diameter of these carbon nanoparticles between 4 and 8 nm. Consequently, concentric-shell fullerenes can be regarded as spherical graphitic nanoparticles, whose electronic structure and optical properties, down to a particle size of at least 4 nm, are strongly governed by the band structure of graphite.

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“…The energy position of this feature can be roughly estimated around 0.7 eV below the corresponding C1s → * threshold of the pure SWCNT. In analogy to p-type doping in graphite intercalation compounds, 15 the presence of this doping-induced feature reflects that the Fermi level of the B-SWCNT shifts to lower energies with respect to that of the SWCNT. Although the corresponding total shift of the Fermi level from a comparison of both spectra alone can be complicated by additional effects such as different excitonic effects or the mixture of semiconducting and metallic tubes, the observed shift by 0.7 eV of the C1s excitation onset establishes a good estimate for the Fermi-level shift assuming a rigid-band shift without strong changes of the SWCNT band structure as it is observed, for instance, for FeCl 3 intercalated SWCNT.…”

Section: Resultsmentioning

confidence: 98%

Formation and electronic properties ofBC3single-wall nanotubes upon boron substitution of carbon nanotubes

et al. 2004

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We report a detailed experimental and theoretical study on the electronic and optical properties of highly boron-substituted (up to 15 at.%) single-wall carbon nanotubes. Core-level electron energy-loss spectroscopy reveals that the boron incorporates into the lattice structure of the tubes, transferring ϳ1 / 2 hole per boron atom into the carbon derived unoccupied density of states. The charge transfer and the calculated Fermi-energy shift in the doped nanotubes evidence that a simple rigid-band model can be ruled out and that additional effects such as charge localization and doping induced band-structure changes play an important role at this high doping levels. In optical absorption a new peak appears at 0.4 eV which is independent of the doping level. Compared to the results from a series of ab initio calculations our results support the selective doping of semiconducting nanotubes and the formation of BC 3 nanotubes instead of a homogeneous random boron substitution.

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Fermi-Level Lowering and the Core Exciton Spectrum of Intercalated Graphite

Cited by 209 publications

References 17 publications

Computing C1<I>s</I> X-ray Absorption for Single-Walled Carbon Nanotubes with Distinct Electronic Type

Computing C1<I>s</I> X-ray Absorption for Single-Walled Carbon Nanotubes with Distinct Electronic Type

Electronic structure and optical properties of concentric-shell fullerenes from electron-energy-loss spectroscopy in transmission

Formation and electronic properties ofBC3single-wall nanotubes upon boron substitution of carbon nanotubes

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