Smallest Carbon Nanotube Is<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>3</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi mathvariant="normal">Å</mml:mi></mml:math>in Diameter

Zhao, Xinluo; Liu, Y.; Inoue, Sakae; Suzuki, Tomoko; Jones, R.; Ando, Yumiko

doi:10.1103/physrevlett.92.125502

Cited by 293 publications

(128 citation statements)

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“…Attempts to synthesize polytwistane in a more direct fashion from acetylene itself are ongoing in our laboratory and will be reported in due course. The relationship of polytwistane to recently reported diamond nanowires 15 and ultra-small carbon nanotubes 16 is also under investigation. To a solution of tetracyclotetradecadiene 11 (30.0 mg, 0.161 mmol, 1.00 eq.)…”

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confidence: 98%

“…In summary, we have described the first synthesis of racemic tritwistane (3), which also yielded a variety of interesting byproducts. Several of these, such as compounds 16,19 and 30, bear a novel carbon skeleton. Our results indicate that N-type additions across laticyclic polyenes are not a viable way to access longer oligotwistanes or polytwistane (8) due to a variety of possible side reactions and difficulties associated with the procurement of precursors.…”

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confidence: 99%

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A step toward polytwistane: synthesis and characterization of C₂-symmetric tritwistane

2014

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A step toward polytwistane: synthesis and characterization of C₂-symmetric tritwistane

2014

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“…The first two SWNTs (diameters 5.51 and 6.36 Å, respectively) can be manufactured, whereas the existence of the third one (diameter 3.38 Å) is still questionable. Some energetic considerations 25 have proposed a lower bound of 4 Å for stable carbon nanotubes, but a recent study by Zhao et al 26 provides evidence that 3 Å diameter tubes can be grown inside multiwalled carbon nanotubes (MWNTs) and that the tube in question is most probably an armchair CNT(2,2).…”

Section: Simulation Methodsmentioning

confidence: 99%

Electronic Properties of Single-Walled Carbon Nanotubes inside Cyclic Supermolecules

2006

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Possible ways for manipulating carbon nanotubes (CNTs) with cyclic supermolecules are studied using density functional theory. Electronic structure calculations with structure optimizations have been performed for the (4,4) and (8,0) single-walled carbon nanotubes (SWNTs) complexed with crown ethers as well as for the (4,0) SWNT with -cyclodextrin. A slight polarization of charge in both the nanotube and the supermolecule is observed upon rotaxane complexation, but the interaction is mainly repulsive, and the systems stay 2.8-3.5 Å apart. The supermolecule does not affect the electronic band structure of the nanotube significantly within such a configuration. The situation differs noticeably for chemically cross-linked SWNTs and crown ethers, where a peak arises at the Fermi energy in the density of states. As a result, the band gap of semiconducting CNT(8,0) (0.5 eV) vanishes, and a new conduction channel opens for the metallic CNT(4,4).

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“…Actually, many studies have been performed to achieve this goal. For instance, small single wall CNTs with 0.3 nm 44,45 and 0.43 nm 46 diameters have already been synthesized. Using solid alloy catalysts, Feng et al have prepared highly homogeneous (higher than 92%) SWCNT.…”

Section: Introductionmentioning

confidence: 99%

Multiporous carbon allotropes transformed from symmetry-matched carbon nanotubes

Cai

Wang

et al. 2016

AIP Advances

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Carbon nanotubes (CNTs) with homogeneous diameters have been proven to transform into new carbon allotropes under pressure but no studies on the compression of inhomogeneous CNTs have been reported. In this study, we propose to build new carbon allotropes from the bottom-up by applying pressure on symmetry-matched inhomogeneous CNTs. We find that the (3,0) CNT with point group C3v and the (6,0) CNT with point group C6v form an all sp3 hybridized hexagonal 3060-Carbon crystal, but the (4,0) CNT with point group D4h and the (8,0) CNT with point group D8h polymerize into a sp2+sp3 hybridized tetragonal 4080-Carbon structure. Their thermodynamic, mechanical and dynamic stabilities show that they are potential carbon allotropes to be experimentally synthesized. The multiporous structures, excellently mechanical properties and special electronic structures (semiconductive 3060-Carbon and semimetallic 4080-Carbon) imply their many potential applications, such as gases purification, hydrogen storage and lightweight semiconductor devices. In addition, we simulate their feature XRD patterns which are helpful for identifying the two carbon crystals in future experimental studies.

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Smallest Carbon Nanotube Is3 Åin Diameter

Cited by 293 publications

References 21 publications

A step toward polytwistane: synthesis and characterization of C₂-symmetric tritwistane

A step toward polytwistane: synthesis and characterization of C₂-symmetric tritwistane

Electronic Properties of Single-Walled Carbon Nanotubes inside Cyclic Supermolecules

Multiporous carbon allotropes transformed from symmetry-matched carbon nanotubes

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Smallest Carbon Nanotube Is3 Åin Diameter

Cited by 293 publications

References 21 publications

A step toward polytwistane: synthesis and characterization of C2-symmetric tritwistane

A step toward polytwistane: synthesis and characterization of C2-symmetric tritwistane

Electronic Properties of Single-Walled Carbon Nanotubes inside Cyclic Supermolecules

Multiporous carbon allotropes transformed from symmetry-matched carbon nanotubes

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A step toward polytwistane: synthesis and characterization of C₂-symmetric tritwistane

A step toward polytwistane: synthesis and characterization of C₂-symmetric tritwistane