Mechanical properties of C58 materials and their dependence on thermal treatment

Ulas, Seyithan; Bundschuh, S.; Jester, Stefan‐S.; Eberl, C.; Kraft, O.; Hölscher, Henrik; Böttcher, Artur; Kappes, Manfred M.

doi:10.1016/j.carbon.2013.10.072

Cited by 7 publications

(24 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At T * < T off both materials still consist of Cs ions and are at least partly stabilized by ionic Cage‐Cs bonds. However, when recalling the pronounced thermally induced modifications observed in a pristine C 58 scaffold one might postulate equivalent reasoning, e.g., the Cs ions facilitate the thermally induced formation of covalent intercage bonds which raise the material stability. This puzzle will be solved by the following detailed spectral analysis of the HT‐Cs x C 58 material.…”

Section: Resultsmentioning

confidence: 99%

“…Incorporated Cs atoms considerably modify the VB‐DOS (spectra (a) and (b) in Figure A and B). The HOMO band of the RT‐C 58 material ( a – c components) is significantly modified: 1) A new peak α at E B = 0.8 eV signalizes the occupation of the C 58 ‐LUMO; 2) the middle component of the HOMO band is essentially depleted and the two edging components are shifted and broadened. The doublet c * dominating the spectrum remains not significantly affected by Cs doping.…”

Section: Resultsmentioning

confidence: 99%

“…We studied the stability of the Cs x C 58 films by monitoring the thermally activated sublimation of Cs, C 58 , and C 60 species (constant heating rate) . The emission of C 58 and C 60 has been routinely studied by recording so‐called TRMS maps, temperature‐resolved mass spectra of the sublimating species.…”

Section: Methodsmentioning

confidence: 99%

“…Currently the only way to generate pure non‐IPR carbon cages is the electron‐impact induced fragmentation of IPR fullerenes (C 60 + e − ( E kin ) → C 58 + + C 2 + 2e − ( E kin ) → C 56 + + …) . By collecting the C 58 + ions on an inert substrate via low‐energy cluster beam deposition (LECBD), a monodisperse carbon material has been successfully fabricated and fairly characterized . They are commonly constituted by randomly oriented covalently stabilized C 58 –C 58 oligomeric chains.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High‐Temperature Cs_xC₅₈ Fullerides

Ulas

Weippert

Malik

et al. 2018

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

Cs doped non‐IPR fullerides (IPR: isolated pentagon rule) have been grown by co‐depositing C58 cations and Cs atoms on highly oriented pyrolytic graphite (HOPG). The C58 cages, as building blocks of the material, form a predominantly covalently stabilized scaffold, C58–C58, which is doped by Cs atoms thermally diffusing across the bulk. The heating of the solid CsxC58 sample is accompanied by sublimation of Cs, C58, and C60 species from the topmost layers of the sample. However, the major part (>94%) of the material survives the heating procedure and constitutes a doped high‐temperature carbon solid, HT‐CsxC58. The new non‐IPR material exhibits surprisingly high thermal stability. It survives a heating flash up to 1100 K at which the classic IPR‐CsxC60 phase does not exist anymore. However, the thermally treated HT‐CsxC58 phase exhibits a considerably depleted Cs content (x < 2) and a significantly modified carbon scaffold. The apparent stability of the scaffold results from covalent C–C bonds interlinking adjacent carbon cages. Cs atoms in the HT‐CsxC58 phase contribute to this stability only as minority species, forming comparably weak ionic bonds with C58–C58 oligomers. However, this interaction facilitates the formation of structural defects (new non‐IPR sites) in carbon cages. The surface topography of the HT‐CsxC58 as monitored by scanning photoemission microscopy, atomic force microscopy, and scanning electron microscopy is governed by islands standing out by their elevated Cs/C ratio.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High‐Temperature Cs_xC₅₈ Fullerides

Ulas

Weippert

Malik

et al. 2018

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is consistent with a C1s component β • at 286.3 eV, as seen for sp 3 -hybridized carbons in literature. 32,38 4. SUMMARY The thermal stability of C 60 H 21 F 9 (=CHF(0)) films grown on HOPG under UHV conditions has been investigated over the temperature range 300−1000K and for film thicknesses ranging from 0.09−225 ML.…”

Section: Ultraviolet Photoelectron Spectroscpy (Ups) Chf(0)mentioning

confidence: 99%

Thermal Decomposition of the Fullerene Precursor C₆₀H₂₁F₉ Deposited on Graphite

et al. 2015

Self Cite

View full text Add to dashboard Cite

Specially fluorinated polycyclic aromatic hydrocarbons (F-PAHs) are of interest as precursors for transition metal catalyzed CVD growth of chiral-index pure singlewalled carbon nanotubes as well as for the rational synthesis of fullerenes. Laser desorption/ ionization of a prototypical F-PAH has recently been shown to lead to C 60 via a sequence of regioselective intramolecular cyclodehydrofluorination steps: C 60 H on graphite under UHV conditions toward exploring the extent to which such intramolecular dehydrofluorination can also occur on a hot chemically inert surface and to what extent intermolecular interactions influence such transformation processes. C 60 H 21 F 9 films were probed in situ by ultraviolet photoionization, X-ray ionization, Raman spectroscopy, and thermal desorption mass spectrometry, as well as by ex situ atomic force microscopy. Heating multilayer films results first in C 60 H 21 F 9 emission from the bulk (peaked at ∼630 K) followed at higher temperatures by desorption from the interface region (in the range 750−850 K). Sublimation from the interface region is also associated with some on-surface cyclo-dehydrofluorination as indicated by C 60 H 21−n F 9−n , n = 1, 2, 3 emission. C 60 was not observed in the desorbed material suggesting that complete cage closure cannot be achieved on HOPG. Furthermore, C 60 H 21 F 9 deposits cannot be fully removed from HOPG. Instead, competing on-surface polycondensation of reactive intermediates yields a fluorinated carbon phase, which remains stable up to at least ∼1000 K. To complement these studies we have also used mass selective ion beam soft-landing to probe the desorption properties of monodispersed films consisting of mass-selected C 60 H 21−n F 9−n fragments, n = 1, 2.

show abstract

Towards Rational Synthesis of Non‐IPR Fullerenes Via Tandem Cyclodehydrofluorination of Fluoroarene‐Based Precursors

Amsharov

2017

Physica Status Solidi (b)

View full text Add to dashboard Cite

In this report the successful generation of the non‐isolated pentagon rule (non‐IPR) fullerene fragment via regioselective cyclodehydrofluorination of a specially designed precursor under laser ionization condition is presented. It is demonstrated that the transformation of the precursor molecule to the highly strained non‐IPR bowl‐shaped hydrocarbon can be achieved effectively at rather low laser fluences, despite the presence of fused pentagons in the structure. This finding opens up a venue towards the rational synthesis of individual isomers of non‐IPR fullerenes and other related non‐IPR architectures by the bottom‐up strategy. The retrosynthetic analysis of fluoroarene‐based precursor molecules for non‐IPR fullerenes C36–C50 is discussed.

show abstract

Mechanical properties of C58 materials and their dependence on thermal treatment

Cited by 7 publications

References 45 publications

High‐Temperature Cs_xC₅₈ Fullerides

High‐Temperature Cs_xC₅₈ Fullerides

Thermal Decomposition of the Fullerene Precursor C₆₀H₂₁F₉ Deposited on Graphite

Towards Rational Synthesis of Non‐IPR Fullerenes Via Tandem Cyclodehydrofluorination of Fluoroarene‐Based Precursors

Contact Info

Product

Resources

About

Mechanical properties of C58 materials and their dependence on thermal treatment

Cited by 7 publications

References 45 publications

High‐Temperature CsxC58 Fullerides

High‐Temperature CsxC58 Fullerides

Thermal Decomposition of the Fullerene Precursor C60H21F9 Deposited on Graphite

Towards Rational Synthesis of Non‐IPR Fullerenes Via Tandem Cyclodehydrofluorination of Fluoroarene‐Based Precursors

Contact Info

Product

Resources

About

High‐Temperature Cs_xC₅₈ Fullerides

High‐Temperature Cs_xC₅₈ Fullerides

Thermal Decomposition of the Fullerene Precursor C₆₀H₂₁F₉ Deposited on Graphite