Condensed phases of all-pentagon<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>20</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>cages as possible superconductors

Miyamoto, Yoshiyuki; Saito, Mineo

doi:10.1103/physrevb.63.161401

Cited by 70 publications

(49 citation statements)

References 20 publications

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“…It can be widely used in many fields such as machine tools and optical coatings due to its high hardness and wear resistance. Furthermore, the film assembled with doped C 20 cages is expected to be a promising candidate for superconductor with a high T c , 11 because the free cluster structure is preserved.…”

Section: Discussionmentioning

confidence: 99%

“…9,10 First principle studies of the condensed phases of C 20 cages suggested they might be possible superconductor with high transition temperature (T c ). 11 Experimentally, ''C 20 -type'' film was synthesized by deposition of low-energy carbon clusters with a size distribution centered around C 20 -C 32 . 12 Raman spectra measured with the assembled film revealed the characteristics of sp 3 hybridization as that predicted for the C 20 fullerene.…”

Section: Introductionmentioning

confidence: 99%

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Memory effect in the deposition ofC20fullerenes on a diamond surface

Du¹,

Pan²,

Ho³

et al. 2002

Phys. Rev. B

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In this paper, the deposition of C 20 fullerenes on a diamond (001)-(2ϫ1) surface and the fabrication of C 20 thin film at 100 K were investigated by a molecular dynamics ͑MD͒ simulation using the many-body Brenner bond order potential. First, we found that the collision dynamic of a single C 20 fullerene on a diamond surface was strongly dependent on its impact energy. Within the energy range 10-45 eV, the C 20 fullerene chemisorbed on the surface retained its free cage structure. This is consistent with the experimental observation, where it was called the memory effect in ''C 20 -type'' films ͓P. Melion et al., Int. J. Mod. B 9, 339 ͑1995͒; P. Milani et al., Cluster Beam Synthesis of Nanostructured Materials ͑Springer, Berlin, 1999͔͒. Next, more than one hundred C 20 ͑10-25 eV͒ were deposited one after the other onto the surface. The initial growth stage of C 20 thin film was observed to be in the three-dimensional island mode. The randomly deposited C 20 fullerenes stacked on diamond surface and acted as building blocks forming a polymerlike structure. The assembled film was also highly porous due to cluster-cluster interaction. The bond angle distribution and the neighbor-atomnumber distribution of the film presented a well-defined local order, which is of sp 3 hybridization character, the same as that of a free C 20 cage. These simulation results are again in good agreement with the experimental observation. Finally, the deposited C 20 film showed high stability even when the temperature was raised up to 1500 K.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Memory effect in the deposition ofC20fullerenes on a diamond surface

Du¹,

Pan²,

Ho³

et al. 2002

Phys. Rev. B

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“…And Miyamoto et al 9) also showed that the simple-cubic-like condensed phase with opened C 20 cages is stable. However the situation is different in the C 20 -rings.…”

Section: Stability and Geometric Configurationmentioning

confidence: 99%

“…Theoretical studies on various structures consisting of C 20 cages such as dimer, trimer and tetramer structures have been carried out, as well as onedimensional (1D), two-dimensional (2D) and three-dimensional (3D) polymers. 8,9) Moreover, connection through intermolecular bond should also result in ring structures, similar to the case in C 60 and C 36 cages. [5][6][7] So far as we know, there is no report on the ring structures composed of C 20 cages, but study of the C 20 -ring structures would help us to understand more about the structures and electronic properties of the C 20 cage and the possible ring structures.…”

Section: Introductionmentioning

confidence: 99%

Structures and Stabilities of Rings Composed of C<SUB>20</SUB> Cages

2007

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The ring structures with D nh , D n , C nv and C nh symmetries composed of C 20 cages have been investigated using the self-consistent field molecular orbital method. It is found that the formation of the C 20 -rings is favorable to stability of the C 20 systems. The influence of structure symmetries and distortion on the stabilities of the C 20 -rings is explored. The strain change due to the structure distortion greatly affects the stabilities of the C 20 -rings. Furthermore, the bonding and electronic properties of the C 20 -ring are also discussed and compared with those of other fullerene-rings such as C 60 -rings and C 36 -rings.

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“…1 This uptake capacity is one of the highest reported for carbon nanomaterials, and therefore makes similar porous carbon structures promising for hydrogen storage applications. In addition to hydrogen storage, 2-4 fullerene-based structures are possible candidates for superconductors, 5 strong lightweight materials, quantum dots, 6,7 and biological applications. 8,9 It has been shown that zeolites, which are aluminosilicate minerals and have a microporous structure, can be used as templates for nanostructures where carbon fills the pores and forms three-dimensional networks.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous carbon structures based on C20

2011

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In this paper, we present computational results for C 20 based solids. We propose structures that are shown to be energetically more favorable and stable than previously suggested structures. The so-called quasigraphite phase and base-centered-monoclinic type structures are found to be the energetically most favorable. The moleculardynamics stability of suggested structures was studied via constant-temperature and constant-pressure techniques and by examining phonon dispersion curves. All the predicted structures demonstrate high stability with respect to temperature and external load. By changing the geometry, the electronic properties can be varied from metallic to insulating.

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Condensed phases of all-pentagonC20cages as possible superconductors

Cited by 70 publications

References 20 publications

Memory effect in the deposition ofC20fullerenes on a diamond surface

Memory effect in the deposition ofC20fullerenes on a diamond surface

Structures and Stabilities of Rings Composed of C<SUB>20</SUB> Cages

Nanoporous carbon structures based on C20

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