Evaluation of Transparent Carbon Nanotube Networks of Homogeneous Electronic Type

Jackson, Roderick; Munro, Andrea M.; Nebesny, Kenneth W.; Armstrong, Neal R.; Graham, Samuel

doi:10.1021/nn9010076

Cited by 60 publications

(52 citation statements)

References 32 publications

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“…Although the CNT network in the experiments contains both metallic and semiconducting tubes, the above approximation is still reasonable for the following reasons. If the semiconducting CNTs are highly doped in an ambient environment, their properties become comparable with those of metallic ones (34,35). Semiconducting CNTs on nonpolar substrates, such as the PDMS used in this work, typically exhibit minimal doping and consequently, have much higher tube resistance and contact resistance (36,37).…”

Section: Significancementioning

confidence: 99%

Microstructural origin of resistance–strain hysteresis in carbon nanotube thin film conductors

Jin

Chortos

Lian

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

121

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A basic need in stretchable electronics for wearable and biomedical technologies is conductors that maintain adequate conductivity under large deformation. This challenge can be met by a network of one-dimensional (1D) conductors, such as carbon nanotubes (CNTs) or silver nanowires, as a thin film on top of a stretchable substrate. The electrical resistance of CNT thin films exhibits a hysteretic dependence on strain under cyclic loading, although the microstructural origin of this strain dependence remains unclear. Through numerical simulations, analytic models, and experiments, we show that the hysteretic resistance evolution is governed by a microstructural parameter [Formula: see text] (the ratio of the mean projected CNT length over the film length) by showing that [Formula: see text] is hysteretic with strain and that the resistance is proportional to [Formula: see text] The findings are generally applicable to any stretchable thin film conductors consisting of 1D conductors with much lower resistance than the contact resistance in the high-density regime.

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Section: Significancementioning

confidence: 99%

Microstructural origin of resistance–strain hysteresis in carbon nanotube thin film conductors

Jin

Chortos

Lian

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

121

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“…Exacerbating the problem, the junction resistance between metallic and semiconducting CNTs is much higher than that between metallic tubes 106. Therefore, it is predicted that a film made entirely from metallic nanotubes, or a mixture of metallic and degeneratively doped p‐type CNTs, will exhibit superior conductivity to a film made from unseparated, undoped tubes134 (producing larger diameter CNTs will also mitigate the deleterious effects of semiconducting tubes by lowering the bandgap). To this end, much research has gone into finding suitable dopants and scalable techniques towards producing all metallic CNTs.…”

Section: Emerging Nanomaterialsmentioning

confidence: 99%

Emerging Transparent Electrodes Based on Thin Films of Carbon Nanotubes, Graphene, and Metallic Nanostructures

Hecht¹,

Hu²,

Irvin³

2011

Advanced Materials

2,086

1,767

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Transparent electrodes are a necessary component in many modern devices such as touch screens, LCDs, OLEDs, and solar cells, all of which are growing in demand. Traditionally, this role has been well served by doped metal oxides, the most common of which is indium tin oxide, or ITO. Recently, advances in nano-materials research have opened the door for other transparent conductive materials, each with unique properties. These include CNTs, graphene, metal nanowires, and printable metal grids. This review will explore the materials properties of transparent conductors, covering traditional metal oxides and conductive polymers initially, but with a focus on current developments in nano-material coatings. Electronic, optical, and mechanical properties of each material will be discussed, as well as suitability for various applications.

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“…Carbon nanotubes possess several properties that make them good candidates as electrodes: high intrinsic conductivity, solution processability, durability, and the potential for production at low cost 11. However, the large variations in tube types, such as diameters, lengths, and chirality, the difficulties in forming uniform films over large areas, and the large tube‐to‐tube junction resistance have prevented the adoption of CNTs as a TE by industry, though important research on dopants and methods of processing continues to improve CNT films 12, 13. Graphene, despite its relatively recent discovery in 2003, has almost matched, if not exceeded, CNTs in performance as a TE.…”

Section: Introductionmentioning

confidence: 99%

Highly Conductive and Transparent PEDOT:PSS Films with a Fluorosurfactant for Stretchable and Flexible Transparent Electrodes

Vosgueritchian

Lipomi

Bao

2011

Adv Funct Materials

1,083

946

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Highly conductive and transparent poly-(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) films, incorporating a fluorosurfactant as an additive, have been prepared for stretchable and transparent electrodes. The fluorosurfactant-treated PEDOT:PSS films show a 35% improvement in sheet resistance (R s ) compared to untreated films. In addition, the fluorosurfactant renders PEDOT:PSS solutions amenable for deposition on hydrophobic surfaces, including pre-deposited, annealed films of PEDOT:PSS (enabling the deposition of thick, highly conductive, multilayer films) and stretchable poly(dimethylsiloxane) (PDMS) substrates (enabling stretchable electronics). Four-layer PEDOT:PSS films have an R s of 46 Ω per square with 82% transmittance (at 550 nm). These films, deposited on a pre-strained PDMS substrate and buckled, are shown to be reversibly stretchable, with no change to R s , during the course of over 5000 cycles of 0 to 10% strain. Using the multilayer PEDOT:PSS films as anodes, indium tin oxide (ITO)-free organic photovoltaics are prepared and shown to have power conversion efficiencies comparable to that of devices with ITO as the anode. These results show that these highly conductive PEDOT:PSS films can not only be used as transparent electrodes in

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Evaluation of Transparent Carbon Nanotube Networks of Homogeneous Electronic Type

Cited by 60 publications

References 32 publications

Microstructural origin of resistance–strain hysteresis in carbon nanotube thin film conductors

Microstructural origin of resistance–strain hysteresis in carbon nanotube thin film conductors

Emerging Transparent Electrodes Based on Thin Films of Carbon Nanotubes, Graphene, and Metallic Nanostructures

Highly Conductive and Transparent PEDOT:PSS Films with a Fluorosurfactant for Stretchable and Flexible Transparent Electrodes

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