Electrical transport properties of percolating random networks of carbon nanotube bundles

Seppala, Saku; Häkkinen, E.; Alava, Mikko J.; Ermolov, Vladimir; Seppälä, Eira T.

doi:10.1209/0295-5075/91/47002

Cited by 11 publications

(32 citation statements)

References 23 publications

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“…Larger linker atoms also move the neighboring carbon atoms away from the TM atom and the average displacement of the six nearest-neighbor carbon atoms is 0.15 Å in the case of a molybdenum or tungsten linker atom. Around a given (8,8) junction, all the C-Mo and C-W bond lengths are similar and their mean value is 2.3 Å.…”

Section: A Structure Of the Tm-atom-cnt Junctionsmentioning

confidence: 94%

“…(4) are listed in Table I for different CNT junctions. A single Cr atom increases the distance between the (5,5) and (8,8) CNTs only a bit compared with the junction without a linker atom. In contrast, the internanotube distance increases clearly more when a Mo or a W atom is placed in the junction.…”

Section: A Structure Of the Tm-atom-cnt Junctionsmentioning

confidence: 98%

“…1. A junction that consists of two (8,8) CNTs is primarily studied. However, the effect of the diameter of a nanotube on the transport is examined by computing electronic transmission functions for a smaller and a larger junction.…”

Section: Examined Systemsmentioning

confidence: 99%

“…The smaller junction has two (5,5) CNTs and the larger junction consists of (11,11) CNTs. The CNTs include 14 unit cells in periodic calculations so that the number of carbon atoms in one (5,5), (8,8), and (11,11) nanotube supercell is 280, 448, and 616, respectively. The first and last four unit cells of the CNTs belong in the Green's function transport calculations to the semi-infinite leads.…”

Section: Examined Systemsmentioning

confidence: 99%

“…A real CNT thin film may be formed by CNT bundles, and the conductivity of the whole film is determined by the properties of CNT bundles. 8 For instance, the film conductivity depends both on the bundle diameter and the number density of interbundle junctions. 9 A nanotube network usually contains both metallic and semiconducting CNTs.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Enhancing conductivity of metallic carbon nanotube networks by transition metal adsorption

Ketolainen

Havu

Puska

2015

The Journal of Chemical Physics

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The conductivity of carbon nanotube thin films is mainly determined by carbon nanotube junctions, the resistance of which can be reduced by several different methods. We investigate electronic transport through carbon nanotube junctions in a four-terminal configuration, where two metallic single-wall carbon nanotubes are linked by a group 6 transition metal atom. The transport calculations are based on the Green’s function method combined with the density-functional theory. The transition metal atom is found to enhance the transport through the junction near the Fermi level. However, the size of the nanotube affects the improvement in the conductivity. The enhancement is related to the hybridization of chromium and carbon atom orbitals, which is clearly reflected in the character of eigenstates near the Fermi level. The effects of chromium atoms and precursor molecules remaining adsorbed on the nanotubes outside the junctions are also examined.

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Section: A Structure Of the Tm-atom-cnt Junctionsmentioning

confidence: 94%

Section: A Structure Of the Tm-atom-cnt Junctionsmentioning

confidence: 98%

Section: Examined Systemsmentioning

confidence: 99%

Section: Examined Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Enhancing conductivity of metallic carbon nanotube networks by transition metal adsorption

Ketolainen

Havu

Puska

2015

The Journal of Chemical Physics

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Synthesis of Carbon Nanotubes by Floating Catalyst Chemical Vapor Deposition and Their Applications

Hou

Zhang

et al. 2021

Adv Funct Materials

101

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Floating catalyst chemical vapor deposition (FCCVD) has been one of the most important techniques for the synthesis of high-quality single-, double-, and multi-wall carbon nanotubes (CNTs). The method is characterized of simple processing, good controllability, and desirable scalability. The bulk morphologies of the synthesized CNTs can be sponge-like, an array, a thin film, or fiber by simply changing the growth parameters and the way they are collected, which facilitates a wide range of applications. The authors comprehensively review the state-of-the-art progress on the controlled growth of CNTs by FCCVD which have a defined number of walls, and controlled diameter, bundle size, and type of conductivity. The properties and possible applications for the CNTs and their hybrids are summarized. Finally, insights into the key challenges and prospects for CNTs synthesized by FCCVD are discussed.

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Highly individual SWCNTs for high performance thin film electronics

Kaskela

Laiho

Fukaya

et al. 2016

Carbon

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We report a continuous floating catalyst chemical vapor deposition synthesis of highly individual single-walled carbon nanotubes (SWCNT) for high performance transparent conducting films (TCF). Active feedback dilution of ferrocene-based catalyst vapor leads to an almost complete elimination of SWCNT bundling and a substantial increase in SWCNT lengths via the suppression of bundling-induced growth termination. The fabricated uniform TCFs exhibit sheet resistances of 89 Ω/sq. at 90% transmittance. This was further improved by micro-patterning, resulting in a sheet resistance of 69 Ω/sq. at 97% transmittance-the highest reported for any carbon nanotube TCFand highly competitive with commercial indium-tin-oxide-TCFs. Furthermore, we demonstrate that thin film transistors fabricated from these highly individual SWCNTs reach charge carrier mobilities up to 100 cm 2 V-1 s-1 and ON/OFF-ratios up to 10 6 .

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Electrical transport properties of percolating random networks of carbon nanotube bundles

Cited by 11 publications

References 23 publications

Enhancing conductivity of metallic carbon nanotube networks by transition metal adsorption

Enhancing conductivity of metallic carbon nanotube networks by transition metal adsorption

Synthesis of Carbon Nanotubes by Floating Catalyst Chemical Vapor Deposition and Their Applications

Highly individual SWCNTs for high performance thin film electronics

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