Preparation of carbon nanotube film with high alignment and elevated density

Han, Baoshuai; Xue, Xiang; Xu, Yanjin; Zhao, Zhiyong; Guo, Enyu; Liu, Chen; Luo, Liangshun; Hou, Hongliang

doi:10.1016/j.carbon.2017.04.072

Cited by 57 publications

(35 citation statements)

References 57 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: 73%

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: 73%

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

et al. 2020

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“…Figure 8(a) shows the effect of CNT alignment on the electrical conductivity of developed nanocomposites containing aligned MWCNTs. As can be seen, alignment of CNTs within the matrix can lead to significant enhancement in the electrical conductivity, which is due to the increase in the interface of CNT bundles that enhanced the contact resistance [27,48]. This trend for parallel direction is significantly higher than perpendicular direction and randomly distributed CNTs.…”

Section: Discussionmentioning

confidence: 94%

“…Enhancement of D ∥ /D ⊥ and G ∥ /G ⊥ values corresponds to improvement of CNT alignment within the matrix, due to higher surface area of aligned CNT projected to applied laser light in parallel direction than perpendicular direction. Abbasi et al [19] and Arjmand et al [20,25,26] used this technique in order to examine the The higher the ratio of G ∥ /G ⊥ the better the quality of aligned CNT network [27]. In a study by Chapkin et al [28], they have developed a technique, which has utilized polarized Raman spectroscopy for evaluation of CNT alignment within the polymer matrix under applied electric field.…”

Section: Justification Of Cnt Alignmentmentioning

confidence: 99%

Electric Field Induced Alignment of Carbon Nanotubes: Methodology and Outcomes

Amani¹,

Hashemi²,

Mousavi³

et al. 2018

Carbon Nanotubes - Recent Progress

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In the current chapter, achievement of aligned carbon nanotube (CNT) network within the matrix via various kinds of electric fields (AC and DC) was evaluated. In this case, alignment mechanism of CNTs within the matrix and two useful techniques for justification of CNT alignment throughout the matrix were examined and presented, respectively. Afterward, effective factors in matter of CNT alignment and applicable procedures for fabrication of nanocomposites containing aligned CNTs were studied and presented, respectively. At the end, significant effects of CNT alignment on overall properties of nanocomposites that include electrical and mechanical properties were evaluated. Achieved results revealed that alignment of CNTs within the matrix can lead to significant improvement in the electrical and mechanical properties of nanocomposites at the same filler loading compared with randomly distribution of CNTs within the matrix, while production steps and conditions can also highly affect the outcome data.

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“…In a recent report, density of CNT arrays in CNT films was improved by eliminating the pores and gaps in the thin film resulting in density improvement by 109% [32], which also, in turn, improved the mechanical strength of 765 ± 15 and 184 ± 58 MPa and electrical conductivity to (1.65 ± 0.15) × 10 5 and (1.04 ± 0.10) × 10 5 S m −1 . The pores and gaps were eliminated by synthesizing continuous CNT aerogel by FCCVD method.…”

Section: Dense Cnt Forest (Yarns/films)mentioning

confidence: 98%

Rapid Growth of Dense and Long Carbon Nanotube Arrays and Its Application in Spinning Thread

Hayashi¹,

Selvam²,

Scholz³

2018

Carbon Nanotubes - Recent Progress

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Carbon nanotubes (CNTs), a dependable allotrope of carbon, are foreseen to lead technology further to its reach. Also, the most researched carbon allotrope in its form. Drawable CNTs have recently unraveled numerous possible applications utilizing vertically aligned CNTs also termed as "CNT forest." In recent years, the rapid growth of dense and long carbon nanotube arrays has succeeded in surpassing its challenges by synthesizing dense and long CNT arrays. Length, density, and drawability tuning in the synthesis of CNT arrays have always been a complex issue lately. However, numerous research techniques emerged focusing on length and density control. Hence, this book chapter aids in unveiling the current achievements in the growth of dense and long CNT arrays and their application in spinning threads or CNT yarns with numerous other possible applications.

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Preparation of carbon nanotube film with high alignment and elevated density

Cited by 57 publications

References 57 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

Electric Field Induced Alignment of Carbon Nanotubes: Methodology and Outcomes

Rapid Growth of Dense and Long Carbon Nanotube Arrays and Its Application in Spinning Thread

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