Post-synthesis treatment improves the electrical properties of dry-spun carbon nanotube yarns

Watanabe, Takumi; Itoh, Akira; Watanabe, Tomohisa; Kizaki, Takeshi; Inaguma, Masayasu; Hosoi, Atushi; Kawada, Hiroyuki

doi:10.1016/j.carbon.2021.09.022

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…i Comparison of the thermal conductivity and density between our CNT films and other materials 48 , 60 – 67 . j Comparison of the tensile strength and electrical conductivity of our CNT fibers with commercial carbon fibers 68 , wet-spun CNT fibers 18 , 69 – 71 , CNT fibers from FCCVD 25 , 56 , 72 – 74 , CNT fibers from array spinning 75 – 79 , common metal materials 67 , and biomass-derived carbon fibers 80 – 86 . …”

Section: Resultsmentioning

confidence: 99%

Continuously processing waste lignin into high-value carbon nanotube fibers

et al. 2022

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High value utilization of renewable biomass materials is of great significance to the sustainable development of human beings. For example, because biomass contains large amounts of carbon, they are ideal candidates for the preparation of carbon nanotube fibers. However, continuous preparation of such fibers using biomass as carbon source remains a huge challenge due to the complex chemical structure of the precursors. Here, we realize continuous preparation of high-performance carbon nanotube fibers from lignin by solvent dispersion, high-temperature pyrolysis, catalytic synthesis, and assembly. The fibers exhibit a tensile strength of 1.33 GPa and an electrical conductivity of 1.19 × 105 S m−1, superior to that of most biomass-derived carbon materials to date. More importantly, we achieve continuous production rate of 120 m h−1. Our preparation method is extendable to other biomass materials and will greatly promote the high value application of biomass in a wide range of fields.

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Section: Resultsmentioning

confidence: 99%

Continuously processing waste lignin into high-value carbon nanotube fibers

et al. 2022

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“…CNTs possess excellent properties like high surface area, superior mechanical strength, and electrical conductivity, making them broadly applicable in materials science, electronics, energy storage, and more. − In 1993, Japanese scientist Iijima first obtained single-walled CNTs with an arc synthesis method . In 1996, Dai et al used CO as the carbon source and metal Mo as the catalytic active particles to produce single-walled CNTs, and proposed the “Yarmulke growth mechanism”: the high surface energy of metals plays an important role in the preparation process of single-walled CNTs .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Nucleation and Structure of Lignin-Based Carbon Nanotubes Synthesized Using Iron via Floating Catalyst Chemical Vapor Deposition

Liu,

Yuan,

et al. 2024

ACS Appl. Nano Mater.

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Lignin is an abundant biomass resource that can be converted to carbon nanotubes (CNTs) via floating catalyst chemical vapor deposition (FCCVD). This study investigates how Fe catalyst properties impact the synthesis, structure, and properties of lignin-derived CNTs. During CNTs synthesis via FCCVD, increasing the ferrocene concentration yields more CNT products, but the catalyst efficiency declines, as evidenced by the appearance of shorter CNTs and more Fe residue in the product. Transmission electron microscopy reveals that the size and morphology of Fe nanoparticles strongly influence CNT structure, defects, and graphene layer alignment in the nanotube sidewalls during growth. High-temperature graphitization effectively removes residual catalysts from the CNTs and improves their crystallinity and conductivity. During graphitization from 1600 to 2800 °C, the graphene interlayer spacing decreases, while the Raman I G /I D ratio increases from 3.16 to 8.08, electrical conductivity increases from 4.05 × 10 4 to 5.92 × 10 4 S m −1 , and thermal conductivity can be enhanced from 31.20 to 50.49 W m −1 K −1 . Correlating catalyst characteristics with CNT structure evolution provides insights into the controlled synthesis of tailored biomass-derived CNTs with specific structures and properties.

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“…The rapid development of wearable electronics, the smart grid, an intelligent society, and deep-sea and deep-space exploration has produced an increasing need for advanced fiber materials. − Carbon nanotube fibers (CNTFs) are a very competitive candidate which are expected to find a wide range of applications including aerospace, railway, and automotive engineering, due to their low-density, high thermal and electrical conductivities, resistance to corrosion and erosion, and excellent mechanical performance. − However, the practical use of CNTFs has been severely restricted due to a major difficulty in joining CNTFs to metals. Especially, joining CNTFs to copper is an immediate problem because of the universal use of Cu as conducting components in electronic and electrical systems.…”

Section: Introductionmentioning

confidence: 99%

Strong Connection of Single-Wall Carbon Nanotube Fibers with a Copper Substrate Using an Intermediate Nickel Layer

Gao,

Xu,

Jiao

et al. 2023

ACS Nano

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Lightweight carbon nanotube fibers (CNTFs) with high electrical conductivity and high tensile strength are considered to be an ideal wiring medium for a wide range of applications. However, connecting CNTFs with metals by soldering is extremely difficult due to the nonreactive nature and poor wettability of CNTs. Here we report a strong connection between single-wall CNTFs (SWCNTFs) and a Cu matrix by introducing an intermediate Ni layer, which enables the formation of mechanically strong and electrically conductive joints between SWCNTFs and a eutectic Sn-37Pb alloy. The electrical resistance change rate (ΔR/R 0 ) of Ni-SWCNTF/solder-Cu interconnects only decreases ∼29.8% after 450 thermal shock cycles between temperatures of −196 and 150 °C, which is 8.2 times lower than that without the Ni layer. First-principles calculations indicate that the introduction of the Ni layer significantly improves the heterogeneous interfacial bond strength of the Ni-SWCNTF/solder-Cu connections.

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Post-synthesis treatment improves the electrical properties of dry-spun carbon nanotube yarns

Cited by 12 publications

References 30 publications

Continuously processing waste lignin into high-value carbon nanotube fibers

Continuously processing waste lignin into high-value carbon nanotube fibers

Insights into the Nucleation and Structure of Lignin-Based Carbon Nanotubes Synthesized Using Iron via Floating Catalyst Chemical Vapor Deposition

Strong Connection of Single-Wall Carbon Nanotube Fibers with a Copper Substrate Using an Intermediate Nickel Layer

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