Purification, structural evolutions, and electrical properties of carbon nanotube yarns processed via incandescent annealing

Khanbolouki, Pouria; Tehrani, Mehran

doi:10.1016/j.carbon.2020.06.069

Cited by 17 publications

(5 citation statements)

References 38 publications

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“…These fibers are usually subjected to postprocessing acid doping and densification, resulting in relatively high conductivities, 0.1-0.5 MS m À1 and up to %2 MS m À1 when doped. [24,25] The catalysts and promoters used in the synthesis remain in the CNT yarns as impurities. Amorphous carbon also forms between the CNTs and their bundles, bridging them and improving both their mechanical and electrical properties.…”

Section: Carbonaceous Conductorsmentioning

confidence: 99%

“…Amorphous carbon also forms between the CNTs and their bundles, bridging them and improving both their mechanical and electrical properties. [25,26] These fibers are commercially available from Huntsman (formerly Nanocomp Technologies Inc.). 3) The third CNT fiber synthesis route is a wet processing approach that involves extruding a premade CNT-acid solution through a spinneret into a coagulation bath, resulting in dense CNT fibers [27] (Figure 4c).…”

Section: Carbonaceous Conductorsmentioning

confidence: 99%

“…Basic characterizations of CNT and graphene should include their Raman spectroscopy (assessing the quality and nature of the nanocarbon), combined scanning electron microscopy (SEM) and energy‐dispersive X‐ray (EDX) spectroscopy (purity and morphology evaluation), and transmission electron microscopy (TEM) (assessing the quality and nanoscale features). [ 6,25 ] Several other spectroscopy and microscopy techniques can be used to further evaluate the composition, chemical groups, defects, sizes and morphologies, and even the electronic nature of nanocarbons. [ 6 ]…”

Section: Electrical Conductorsmentioning

confidence: 99%

See 2 more Smart Citations

Advanced Electrical Conductors: An Overview and Prospects of Metal Nanocomposite and Nanocarbon Based Conductors

Tehrani

2021

Physica Status Solidi (a)

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Advanced electrical conductors that outperform copper and aluminum can revolutionize our lives by enabling billions of dollars in energy savings and facilitating a transition to an electric mobility future. Nanocarbons (carbon nanotubes and graphene) present a unique opportunity for developing advanced conductors for electrical power, communications, electronics, and electric machines for the defense, energy, and automotive industries. Herein, the major research progress in the field of advanced nanocarbon-based and metalnanocarbon conductors is compiled. The benefits and drawbacks of advanced conductors are also elucidated with respect to conventional ones and their materials science, mechanical and physical properties, and characterization are discussed. Finally, several areas of future research for advanced electrical conductors are proposed.

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Section: Carbonaceous Conductorsmentioning

confidence: 99%

Section: Carbonaceous Conductorsmentioning

confidence: 99%

Section: Electrical Conductorsmentioning

confidence: 99%

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Advanced Electrical Conductors: An Overview and Prospects of Metal Nanocomposite and Nanocarbon Based Conductors

Tehrani

2021

Physica Status Solidi (a)

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“…I D , in contrast, is predominantly a measure of sp 3 -hybridized carbon; it is attributed to the content of amorphous carbon that is present in the CNT fibers and has a higher electrical resistance relative to CNTs [22]. Indeed, TEM imaging previously performed on analogous Nanocomp CNT fibers revealed interspersed amorphous carbon [23], although the conclusions drawn from this work are hard to justify given the physical changes to the individual CNTs as part of the TEM sample preparation.…”

Section: Thermal Annealing In Nanoprobementioning

confidence: 99%

Increased Electrical Conductivity of Carbon Nanotube Fibers by Thermal and Voltage Annealing

Gangoli

Barnett

McGettrick

et al. 2021

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We report the effect of annealing, both electrical and by applied voltage, on the electrical conductivity of fibers spun from carbon nanotubes (CNTs). Commercial CNT fibers were used as part of a larger goal to better understand the factors that go into making a better electrical conductor from CNT fibers. A study of thermal annealing in a vacuum up to 800 °C was performed on smaller fiber sections along with a separate analysis of voltage annealing up to 7 VDC; both exhibited a sweet spot in the process as determined by a combination of a two-point probe measurement with a nanoprobe, resonant Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). Scaled-up tests were then performed in order to translate these results into bulk samples inside a tube furnace, with similar results that indicate the potential for an optimized method of achieving a better conductor sample made from CNT fibers. The results also help to determine the surface effects that need to be overcome in order to achieve this.

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“…In addition, electric fields are widely used to control the microstructures of materials consisting of independent units. These features show the potential of employing electric fields to tune the orientation and graphitization of CFs. − Herein, we used an in situ electrothermal approach for the carbonization and graphitization of CFs. We initially conducted graphitization experiments using commercial CFs (T800, usually obtained via carbonization at 1400–1500 °C).…”

Section: Introductionmentioning

confidence: 99%

In Situ Electrothermal Approach for the Synthesis of High-Performance Carbon Fiber

Sun

Wang²,

Chen

et al. 2022

ACS Sustainable Chem. Eng.

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Carbon fibers (CFs) have long been of great interest as a crucial material for the aerospace industry. Their practical application requires higher performance and efficient fabrication. This study presents an in situ electrothermal approach for graphitizing CFs. During the electrothermal process, an electric field manipulates the growth of graphite microcrystalline structures, yielding single, regular, large graphite microcrystals, thereby inducing their alignment. The in situ electrothermal approach increased the strength of the resulting CFs by 50.3% and enhanced their Young’s moduli by 9.2% compared with conventional approaches. Moreover, the use of a molecular dynamics (MD)–Reaxff force field and density functional theory calculations in conjunction with the characterization tools revealed the positive effect of the electric field on microcrystalline growth, which explains the peculiar microstructures and enhanced mechanical properties of CFs prepared using the electrothermal approach. Accordingly, this approach is expected to be a better alternative to the current graphitization and carbonization process in the future.

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Purification, structural evolutions, and electrical properties of carbon nanotube yarns processed via incandescent annealing

Cited by 17 publications

References 38 publications

Advanced Electrical Conductors: An Overview and Prospects of Metal Nanocomposite and Nanocarbon Based Conductors

Advanced Electrical Conductors: An Overview and Prospects of Metal Nanocomposite and Nanocarbon Based Conductors

Increased Electrical Conductivity of Carbon Nanotube Fibers by Thermal and Voltage Annealing

In Situ Electrothermal Approach for the Synthesis of High-Performance Carbon Fiber

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