Laser welding of carbon nanotube networks on carbon fibers from ultrasonic-directed assembly

Liu, Yuting; Yao, Tingting; Zhang, Wei‐Song; Wu, Gang-Ping

doi:10.1016/j.matlet.2018.09.161

Cited by 25 publications

(6 citation statements)

References 14 publications

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“…The doping method involves introducing other elements to form unique structures, which makes the experimental process more complicated to control. The CNTs welding method involves breaking carbon–carbon bonds by high temperatures or chemical catalysis to regrow them. − Welding methods can be classified into chemical vapor deposition, , ultrasonic, , high-energy particle beam irradiation, − laser induced, , and Joule heat induced. , Among them, researchers have found that the Joule heat-welding method can realize CNTs welding at different scales and improve the electrical properties of CNTs by removing impurities, repairing defects, and enhancing crystallinity on carbon nanotubes. It can reach the melting temperature quickly, which is convenient and low cost.…”

Section: Introductionmentioning

confidence: 99%

Welding Model for a Carbon Nanotube Bundle with Staggered Electrodes: Implications for Conductivity with Joule Heating

Ouyang

Lin

et al. 2023

ACS Appl. Nano Mater.

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Carbon nanotubes (CNTs) have excellent electrical properties. However, it is challenging to demonstrate these properties in actual electrochemical measurements fully. Previous research has improved the electrical properties of CNTs through welding experiments. But the mechanism of the conductivity enhancement is still unclear. The welding process lacks adequate mechanistic studies and theoretical models. This article presents a theoretical model of a CNT circuit with staggered electrodes, which considers the effect of twist angle on a CNT bundle. A welding model of the CNT bundle circuit is also developed based on the structural changes of CNTs after welding and characterized by the resistance ratio of the CNT circuit pre- and post-welding. The welding model is analyzed to explore how the quantity, diameter, and length of CNTs in the bundle affect the welding effect. An electrical measurement system for CNTs was established to validate the welding model using a nanomanipulation system compatible with a scanning electron microscope. Then, a constant voltage and long-duration electric welding experiment was performed, which showed that the conductivity was enhanced about 1.5–4 times after welding. The results also demonstrated that longer and fewer CNTs in the bundle could improve the electrical conductivity by the welding process more significantly. These findings were consistent with the trend of the welding model. This article establishes a welding theoretical model of the CNT bundle with staggered electrodes, which effectively accounts for the electrical conductivity enhancement during CNT welding and will help more fully express excellent performance in carbon-based nanoelectronic devices, nanoelectromechanical systems, and electrocatalysts in its manufacturing stage.

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Section: Introductionmentioning

confidence: 99%

Welding Model for a Carbon Nanotube Bundle with Staggered Electrodes: Implications for Conductivity with Joule Heating

Ouyang

Lin

et al. 2023

ACS Appl. Nano Mater.

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“…The excellent properties of carbon nanotubes (CNTs) have been fueling much interest in the emerging fields of nanotechnology in the past few decades. − The outstanding mechanical, chemical, thermal, and electrical properties of CNTs make them attractive for many applications ranging from polymer composites to energy storage and biomedical fields. − Essential to these emerging areas is the ability to easily handle CNTs in various solvents on large scales. However, the pristine CNTs (P-CNTs) are typically a few micrometers long and are bundled/entangled due to van der Waals attraction, resulting in poor dispersibility in most solvents.…”

Section: Introductionmentioning

confidence: 99%

Oxygen Defect Engineering toward the Length-Selective Tailoring of Carbon Nanotubes via a Two-Step Electrochemical Strategy

et al. 2020

Self Cite

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A systematic study shows that carbon nanotubes (CNTs) with tunable lengths can be obtained by a simple two-step electrochemical approach via oxygen defect engineering. The preoxidation of CNTs in the H2SO4 electrolyte controllably introduces oxygen defects onto the sp2-hybrid carbon skeleton. This is the key to high-efficiency tailoring of the CNTs with different length distributions (i.e., ∼640, ∼308, and ∼130 nm) by the following oxidation in NaOH electrolyte. In addition, the short-cut CNTs are free of metal impurities and destructive damage to their tubular structures, displaying excellent dispersibility in various solvents. This nondestructive cutting and purification strategy is a low-cost robust pathway to the scalable manufacturing of length-selective CNTs for various practical applications.

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“…Currently, two modifying methods have been developed to improve the dispersion of CNTs: noncovalent and covalent modification. The former mainly includes ball milling, mechanical stirring, and ultrasonication [11][12][13]; the latter mainly involves the introduction of reactive groups, such as carboxyl, hydroxyl, and amino groups, onto the surface of CNTs by oxidizing and etching under the action of H 2 SO 4 and HNO 3 or other strong oxidants [14,15]. Epoxy resin (EP) is one of the most widely used thermosetting resins due to its excellent mechanical and bonding properties, chemical resistance, and processing simplicity [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Rapid Preparation of MWCNTs/Epoxy Resin Nanocomposites by Photoinduced Frontal Polymerization

et al. 2020

Materials

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Due to their excellent mechanical and thermal properties and medium resistance, epoxy/carbon nanotubes and nanocomposites have been widely used in many fields. However, the conventional thermosetting process is not only time- and energy-consuming, but also causes the agglomeration of nanofillers, which leads to unsatisfactory properties of the obtained composites. In this study, multi-walled carbon nanotubes (MWCNTs)/epoxy nanocomposites were prepared using UV photoinduced frontal polymerization (PIFP) in a rapid fashion. The addition of MWCNTs modified by a surface carboxylation reaction was found to enhance the impact strength and heat resistance of the epoxy matrix effectively. The experimental results indicate that with 0.4 wt % loading of modified MWCNTs, increases of 462.23% in the impact strength and 57.3 °C in the glass transition temperature Tg were achieved. A high-performance nanocomposite was prepared in only a few minutes using the PIFP approach. Considering its fast, energy-saving, and environmentally friendly production, the PIFP approach displays considerable potential in the field of the fast preparation, repair, and deep curing of nanocomposites and coatings.

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Laser welding of carbon nanotube networks on carbon fibers from ultrasonic-directed assembly

Cited by 25 publications

References 14 publications

Welding Model for a Carbon Nanotube Bundle with Staggered Electrodes: Implications for Conductivity with Joule Heating

Welding Model for a Carbon Nanotube Bundle with Staggered Electrodes: Implications for Conductivity with Joule Heating

Oxygen Defect Engineering toward the Length-Selective Tailoring of Carbon Nanotubes via a Two-Step Electrochemical Strategy

Rapid Preparation of MWCNTs/Epoxy Resin Nanocomposites by Photoinduced Frontal Polymerization

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