Self-Assembly of Subnanometer-Diameter Single-Wall MoS
            <sub>2</sub>
            Nanotubes

Remškar, Maja; Mrzel, Aleš; Škraba, Z.; Jesih, Adolf; Čeh, Miran; Demšar, Jure; Stadelmann, PA; Lévy, F.; Mihailović, D.

doi:10.1126/science.1059011

Cited by 512 publications

(374 citation statements)

References 24 publications

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“…Layered nanotubes can be single walled [12][13][14][15] or multiwalled. [1][2][3][4] In some cases these nanotubes are nanoscrolls, [16][17][18] or jelly roll nanotubes, meaning one layer is scrolled to form a tube ͑the cross section is a spiral͒.…”

Section: Introductionmentioning

confidence: 99%

Polygonal model for layered inorganic nanotubes

2009

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Multiwalled inorganic nanotubes with circular cross sections must have either an incoherent interface or a large amount of strain. However, nanotubes with a polygonal cross section can have a coherent interface with considerably less strain. We present a model for polygonal nanotubes with no defects where the chirality of the nanotube determines the shape of the cross section. Circular and polygonal nanotubes are compared based on their strain energy and interfacial energy. We have used first-principles calcuations to parameterize strain and interfacial energy for TiS 2 nanotubes. These calculations show that the polygonal model is energetically favorable to the circular model when the inner radius is above a critical radius, 6.2 Å for a TiS 2 nanotube with ten layers. These results should provide insight into further investigations of nanotube structure and allow computational studies to more accurately predict nanotube properties.

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Section: Introductionmentioning

confidence: 99%

Polygonal model for layered inorganic nanotubes

2009

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“…They are produced in a one-step synthetic process, making them much simpler to produce than the previous molybdenum-chalcogenide nanotubes, such as MoS 2 I 1/3 . 11 The stoichiometries synthesized so far are Mo 6 S 3 I 6 , 5 Mo 6 S 4.5 I 4.5 , 8 and Mo 6 S 2 I 8 , all of which have excellent mechanical and electrical properties. Local density approximation band structure calculations of the Mo 6 S 3 I 6 nanowire predict it to be semimetallic, 12 and Ohmic behavior of this stoichiometry has been observed.…”

Section: Introductionmentioning

confidence: 99%

Dispersion and purification of Mo6S3I6 nanowires in organic solvents

McCarthy

Nicolosi

Vengust³

et al. 2007

Journal of Applied Physics

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Sedimentation measurements have been performed on dispersions of Mo 6 S 3 I 6 nanowires in a range of common solvents. By far the best solvents were N , N-dimethylformamide ͑DMF͒ and acetone. Stable dispersions of purified Mo 6 S 3 I 6 nanowires in DMF, with concentrations as high as 0.06 g l −1 , could be produced. Detailed analysis of the sedimentation curves showed that the material consisted of three phases, two insoluble phases and one which could be stably dispersed. We associate the insoluble phases with pseudospherical impurities and insoluble nanowires. The sedimenting nanowires tend to be in the form of large diameter bundles, in contrast to the dispersed phase which consists of nanowires arranged in smaller bundles. The average diameters of the nanowire bundles stably suspended in DMF are 12± 14 nm. The measured sedimentation time constants of the insoluble nanowires agree very well with theory allowing us to calculate the solid-fluid interaction parameter, ␤, to be very close to 10 5 Pa. The material could be purified by controlled sedimentation hence the identification of the various phases was confirmed by x-ray photoelectron spectroscopy and scanning electron microscopy.

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“…5 These nanotubes have an average outer diameter of about 25 nm. MoS 2 and WS 2 nanotubes have also been synthesized by chemical transportation using iodine as the transport agent, [6][7][8] by the activation method ͑acid treatment following by sonication͒, 9 and by template synthesis. 10 The yield of nanotubes usually is in the range of 15-20% by these approaches.…”

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confidence: 99%