Unexpectedly High Yield Carbon Nanotube Synthesis from Low-Activity Carbon Feedstocks at High Concentrations

Kimura, H.; Goto, Jundai; Yasuda, Satoshi; Sakurai, Shunsuke; Yumura, Motoo; Futaba, Don N.; Hata, Kenji

doi:10.1021/nn305513e

Cited by 40 publications

(30 citation statements)

References 32 publications

(77 reference statements)

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“…forest) at each stage. [37][38][39][40] This method has been shown to synthesize highly purity, catalyst-free SWCNTs, with an outer specific surface area of 1150 m 2 /g (ideal: 1315 m 2 /g), which corresponded to SWCNTs with an absolute purity of ~97% (i.e. 1a).…”

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confidence: 99%

Quantitative assessment of the effect of purity on the properties of single wall carbon nanotubes

et al. 2015

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We quantitatively demonstrate the importance of high purity for the application of single wall carbon nanotubes (SWCNTs), materials solely composed of one surface, by examining the effects of carbon impurities on the electrical, thermal, and mechanical properties of both as-grown SWCNT forests and processed buckypaper. While decreases in properties were expected, our results showed the extreme sensitivity of SWCNT properties to carbonaceous impurities either through scattering in the individual SWCNTs or an inhibition of the ability to form inter-SWCNT junctions. Each property showed a nonlinear decrease (as high as 40%) with the addition of low levels of carbon impurities (∼15 wt%), which demonstrates that purity is as important as the crystalline structure.

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Quantitative assessment of the effect of purity on the properties of single wall carbon nanotubes

et al. 2015

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“…Reactive carbon‐rich precursor fragments generated at high temperatures from typically small molecular precursors like ethene, ethine, ethyl alcohol, methane, propane, or butane do react with the catalyst particles and form the growing CNTs on the catalyst surface . The growth rate and thus the CNT yield does depend on the chosen feedstock and is increased when larger and fully saturated carbon precursors are used . In addition, hydrogen gas serves as a growth promoter in CNT growth.…”

Section: Synthesis and Growth Of Vacntsmentioning

confidence: 99%

Vertically Aligned Carbon Nanotubes as Platform for Biomimetically Inspired Mechanical Sensing, Bioactive Surfaces, and Electrical Cell Interfacing

Schneider

2017

Adv. Biosys.

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Vertically aligned carbon nanotubes (VACNTs) are one dimensional carbon objects anchored atop of a solid substrate. They are geometrically fixed in contrast to their counterparts, randomly oriented carbon nanotubes (CNTs). In this progress report, the breadth in which these one dimensional, mechanically flexible, though robust and electrical conducting carbon nanostructures can be employed as functional material is shown and our research is put in perspective to work in the last five to ten years. The connection between the different areas touched in this report is the biomimetic‐materials approach, which rely on the hairy morphology of VACNTs. These properties in connection with their electrical conductivity offer possibilities towards new functional features and applications of VACNTs. To appreciate the possibilities of biomimetic research with VACNTs, first their material characteristics are given to make the reader familiar with specific features of their synthesis, the peculiarities in arranging and controlling the morphology of CNTs in a vertical alignment as well as a current understanding of these properties on a microscopic basis. In doing so, similarities as well as differences, which offer new possibilities for biomimetic studies of VACNTS with respect to multiwalled randomly oriented CNTs, will become clear.

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“…Apt examples include varied hydrocarbon carbon feedstock, the use of additive gases (water, CO 2 , etc. ), plasmas, hot filament, catalyst buffer materials, porous substrates, alloyed catalysts, and a variety of conditions and ambient [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Consequently, CNT synthesis technology has advanced to a stage where millimeter-scale tall, vertically aligned SWCNTs arrays, or “forests”, can be routinely synthesized for large-scale production.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, CNT synthesis technology has advanced to a stage where millimeter-scale tall, vertically aligned SWCNTs arrays, or “forests”, can be routinely synthesized for large-scale production. Further, the SWCNTs within these forests have shown to possess exceptional properties, such as high purity, alignment, high surface area, and long length [ 7 , 8 , 16 , 17 , 18 ]. These properties have afforded the development of CNT applications, exemplified by strain sensors, aerogel muscles, electro-catalysts for fuel cells, stretchable conductors, super-capacitors, microfluidic chips, electric motors and generators, heat exchangers as thermal/electrical conductive polymers (rubber), and metal and ceramic composites [ 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

The Application of Gas Dwell Time Control for Rapid Single Wall Carbon Nanotube Forest Synthesis to Acetylene Feedstock

et al. 2015

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One aspect of carbon nanotube (CNT) synthesis that remains an obstacle to realize industrial mass production is the growth efficiency. Many approaches have been reported to improve the efficiency, either by lengthening the catalyst lifetime or by increasing the growth rate. We investigated the applicability of dwell time and carbon flux control to optimize yield, growth rate, and catalyst lifetime of water-assisted chemical vapor deposition of single-walled carbon nanotube (SWCNT) forests using acetylene as a carbon feedstock. Our results show that although acetylene is a precursor to CNT synthesis and possesses a high reactivity, the SWCNT forest growth efficiency is highly sensitive to dwell time and carbon flux similar to ethylene. Through a systematic study spanning a wide range of dwell time and carbon flux levels, the relationship of the height, growth rate, and catalyst lifetime is found. Further, for the optimum conditions for 10 min growth, SWCNT forests with ~2500 μm height, ~350 μm/min initial growth rates and extended lifetimes could be achieved by increasing the dwell time to ~5 s, demonstrating the generality of dwell time control to highly reactive gases.

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Unexpectedly High Yield Carbon Nanotube Synthesis from Low-Activity Carbon Feedstocks at High Concentrations

Cited by 40 publications

References 32 publications

Quantitative assessment of the effect of purity on the properties of single wall carbon nanotubes

Quantitative assessment of the effect of purity on the properties of single wall carbon nanotubes

Vertically Aligned Carbon Nanotubes as Platform for Biomimetically Inspired Mechanical Sensing, Bioactive Surfaces, and Electrical Cell Interfacing

The Application of Gas Dwell Time Control for Rapid Single Wall Carbon Nanotube Forest Synthesis to Acetylene Feedstock

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