Multi-property enhancement of aligned carbon nanotube thin films from floating catalyst method

Liu, Peng; Tan, Yu Feng; Hu, Dennis C.M.; Jewell, Daniel; Duong, Hai M.

doi:10.1016/j.matdes.2016.07.045

Cited by 42 publications

(12 citation statements)

References 63 publications

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“…In general, the as-collected CNT thin films demonstrated electrical conductivities of 885 S/cm, 1473 S/cm, and 1820 S/cm, as more water was added into the system. These extraordinary electrical properties confirmed the high quality of the collected CNTs by being highly comparable to those of the mechanically densified FCCVD-CNT films reported [46][47][48], possibly due to a larger DWCNT proportion with fewer defects. During the process of composite manufacturing, the electrical conductivities of CNT-0, and -1 groups were further enhanced, as new electrical pathways might have been built in the through-thickness direction with additional densification.…”

Section: Electrical Conductivitiessupporting

confidence: 72%

Continuous Synthesis of Double-Walled Carbon Nanotubes with Water-Assisted Floating Catalyst Chemical Vapor Deposition

et al. 2020

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Double-walled carbon nanotubes (DWCNTs) were synthesized and continuously collected using a water-assisted floating catalyst chemical vapor deposition (FCCVD) method. Differing from the conventional water-assisted synthesis in which water vapor is one part of the carrier gas mixture, we included de-ionized water in the catalyst system, which achieved a more uniform and controlled distribution for efficient DWCNT production. Using a water-assisted FCCVD process with optimized conditions, a transition from multi- to double-walled CNTs was observed with a decrease in diameters from 19–23 nm to 10–15 nm in tandem with an elevated Raman IG/ID ratio up to 10.23, and corroborated from the decomposition peak shifts in thermogravimetric data. To characterize the mechanical and electrical improvements, the FCCVD-CNT/bismaleimide (BMI) composites with different water concentrations were manufactured, revealing high electrical conductivity of 1720 S/cm along the bundle alignment (collection) direction, and the nano-indentation tests showed an axial reduced modulus at 65 GPa. A consistent value of the anisotropic ratio at ~3 was observed comparing the longitudinal and transverse properties. The continuous capability of the presented method while maintaining high quality is expected to result in an improved DWCNT mass production process and potentially enhance the structural and electrical applications of CNT nanocomposites.

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Section: Electrical Conductivitiessupporting

confidence: 72%

Continuous Synthesis of Double-Walled Carbon Nanotubes with Water-Assisted Floating Catalyst Chemical Vapor Deposition

et al. 2020

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“…of Synthesis Publications with additional papers from that period added as follows Review papers: 2014 [62,63], 2016 [47], 2017 [64,51]. Post-processing and application papers: 2015 [65,66], 2016 [67,68,69,70,71,72,73,74,75,76,63,77,78,41,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96], 2017 [97,98,99,100,101,102,103,104,105,106,107,108,…”

Section: Parameter Measurement and Characterisationmentioning

confidence: 99%

Mapping the parameter space for direct-spun carbon nanotube aerogels

Weller

Smail

Elliott

et al. 2019

Carbon

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“…Also, the values of ( h / R ) in experiments can be estimated in a straightforward way from a calculation based on the mass balance (see Supporting Information). For example, the criterion for obtaining the bubble stability is observed to be ∼10 –3 of ( h / R ) for the encapsulated solid bubbles (Δ P ≈ 50 kPa), consisting of the interwoven ODA-CNT shell ( E ≈ 2 GPa, ν = 0.33) …”

Section: Resultsmentioning

confidence: 99%

Microfluidic Synthesis of Carbon Nanotube-Networked Solid-Shelled Bubbles

Jun

Lee

et al. 2020

Langmuir

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Carbon nanotubes (CNTs) have attracted considerable attention because of their high electrical conductivity and outstanding mechanical properties. As such, there have been numerous attempts to form CNTs into diverse structures for use in a wide range of applications. However, the intrinsic high aspect ratios of CNTs and resulting deformability have prevented the fabrication of sophisticated CNT-based structures, especially for three-dimensional (3D) cellular architectures. To challenge this limitation, we present a novel method to fabricate a 3D CNT cellular network from the assembly of microfluidically synthesized CNT-shelled microbubbles. We successfully generated stable spherical CNT-shelled bubbles with excellent size and shape uniformity by precisely controlling bubble dimensions by varying microfluidic variables. We also developed a fundamental understanding of the bubble stability, which allowed us to suppress shrinkage-induced deformation. The synthesized CNT-shelled bubbles were assembled into a 3D close-packed structure, followed by treatment with thermal reduction to induce interfacial bonding and transformation into a closed cellular network structure. Overall, this work provides a new strategy of assembling 1D nanomaterials as the building blocks for well-regulated 3D closed cellular architectures with improved structural or physical properties.

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Multi-property enhancement of aligned carbon nanotube thin films from floating catalyst method

Cited by 42 publications

References 63 publications

Continuous Synthesis of Double-Walled Carbon Nanotubes with Water-Assisted Floating Catalyst Chemical Vapor Deposition

Continuous Synthesis of Double-Walled Carbon Nanotubes with Water-Assisted Floating Catalyst Chemical Vapor Deposition

Mapping the parameter space for direct-spun carbon nanotube aerogels

Microfluidic Synthesis of Carbon Nanotube-Networked Solid-Shelled Bubbles

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