Intramolecular structures of C60 and C84 molecules on Si(111)-7×7 surfaces by scanning tunneling microscopy

Huang, Chih-Pong; Su, C. W.; Ho, Mon−Shu

doi:10.1016/j.apsusc.2008.02.044

Cited by 20 publications

(13 citation statements)

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“…The molecules were imaged as featureless spherical species (Figure 3 b); however, under certain conditions, for example, with an adsorbate on the probe tip, the intramolecular structure was resolved (Figure 3 b, inset). The structure was similar to that observed for a C 84 isomeric mixture [18] and suggests a p-electron system decoupled from the substrate. Since the possibility of CÀC bond rearrangement was excluded by the experiments with precursor 2, we assume that the newly formed molecule is the C 84 (20) fullerene.…”

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confidence: 66%

“…Furthermore, these interactions could lead to the modification of the underlying surface. These effects were observed for C 60 after annealing on various substrates, including Pt(111), [15,16] as well as for an isomeric mixture of C 84 on Si(111)-7 7 (apparent height 0.59-0.69 nm), [17,18] in which the molecule-substrate interaction is considered to be weaker than that with the Pt(111) surface (see Ref. [18] and references therein).…”

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confidence: 88%

“…These effects were observed for C 60 after annealing on various substrates, including Pt(111), [15,16] as well as for an isomeric mixture of C 84 on Si(111)-7 7 (apparent height 0.59-0.69 nm), [17,18] in which the molecule-substrate interaction is considered to be weaker than that with the Pt(111) surface (see Ref. [18] and references therein). The molecules were imaged as featureless spherical species (Figure 3 b); however, under certain conditions, for example, with an adsorbate on the probe tip, the intramolecular structure was resolved (Figure 3 b, inset).…”

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confidence: 88%

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Towards the Isomer‐Specific Synthesis of Higher Fullerenes and Buckybowls by the Surface‐Catalyzed Cyclodehydrogenation of Aromatic Precursors

et al. 2010

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confidence: 88%

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Towards the Isomer‐Specific Synthesis of Higher Fullerenes and Buckybowls by the Surface‐Catalyzed Cyclodehydrogenation of Aromatic Precursors

et al. 2010

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“…The transformation typically occurs at substantially lower temperatures than necessary for cyclodehydrogenation by flash vacuum pyrolysis in gas phase, as seen, for example, for C 60 H 30 on Pt(111) . 12 Along similar lines, planar C 84 H 42 molecules deposited onto Pt(111) have been efficiently converted into dome-shaped objects via heating to ∼753 K. 13,14 The structural selectivity of surface-catalyzed thermal conversion has also been studied for C 60 H 30 on TiO 2 (110), 15 confirming that cyclodehydrogenation rather than (internal) Stone−Wales rearrangement is responsible for "inverted Buckybowl" formation.…”

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confidence: 97%

Thermal Decomposition of the Fullerene Precursor C₆₀H₂₁F₉ Deposited on Graphite

et al. 2015

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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.

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“…The inset presents a close view of the C 84 molecule, indicating that C 84 molecules are aligned vertically to the Si͑111͒ surface. 17 Profile analysis of C 84 molecules on Si͑111͒ surface in Figs. 1͑a͒ and 1͑b͒ reveals that the heights and spacing are approximately 6.5 and 11.7 Å for a single C 84 layer on an Si͑111͒ surface.…”

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Nanomeasurements of electronic and mechanical properties of fullerene embedded Si(111) surfaces

Huang

et al. 2010

Applied Physics Letters

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This study describes the feasibility of fabricating of a single layer of fullerene embedded Si surface through a controlled self-assembly mechanism in an ultrahigh vacuum (UHV) chamber. The characteristics of the fullerene embedded Si surface are investigated directly using UHV-scanning probe microscopy. Additionally, the band gap energy and field emission parameters, including turn-on field and the field enhancement factor beta of the fullerene embedded Si substrate, are determined using a high-voltage source measurement unit and UHV-scanning tunneling microscopy, respectively. Moreover, the nanomechanical properties, which represent the stress of the fullerene embedded Si substrates, are assessed by an environment atomic force microscope (AFM) and UHV-AFM, respectively. Results of this study demonstrate that a single layer of the fullerene embedded surface has superior properties for nanotechnology applications owing to the ability to control the self-assembly mechanism of fabrication. (C) 2010 American Institute of Physics. [doi:10.1063/1.3475775

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Intramolecular structures of C60 and C84 molecules on Si(111)-7×7 surfaces by scanning tunneling microscopy

Cited by 20 publications

References 19 publications

Towards the Isomer‐Specific Synthesis of Higher Fullerenes and Buckybowls by the Surface‐Catalyzed Cyclodehydrogenation of Aromatic Precursors

Towards the Isomer‐Specific Synthesis of Higher Fullerenes and Buckybowls by the Surface‐Catalyzed Cyclodehydrogenation of Aromatic Precursors

Thermal Decomposition of the Fullerene Precursor C₆₀H₂₁F₉ Deposited on Graphite

Nanomeasurements of electronic and mechanical properties of fullerene embedded Si(111) surfaces

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Intramolecular structures of C60 and C84 molecules on Si(111)-7×7 surfaces by scanning tunneling microscopy

Cited by 20 publications

References 19 publications

Towards the Isomer‐Specific Synthesis of Higher Fullerenes and Buckybowls by the Surface‐Catalyzed Cyclodehydrogenation of Aromatic Precursors

Towards the Isomer‐Specific Synthesis of Higher Fullerenes and Buckybowls by the Surface‐Catalyzed Cyclodehydrogenation of Aromatic Precursors

Thermal Decomposition of the Fullerene Precursor C60H21F9 Deposited on Graphite

Nanomeasurements of electronic and mechanical properties of fullerene embedded Si(111) surfaces

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Thermal Decomposition of the Fullerene Precursor C₆₀H₂₁F₉ Deposited on Graphite