Monitoring a Micromechanical Process in Macroscale Carbon Nanotube Films and Fibers

Ma, Wu; Liu, Luqi; Yang, Rong; Zhang, Taihua; Zhang, Zhong; Li, Song; Ren, Yan; Shen, Jun; Niu, Zhiqiang; Zhou, Weiya; Xie, Sishen

doi:10.1002/adma.200801335

Cited by 154 publications

(124 citation statements)

References 22 publications

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“…Directly synthesized strong films with simple and uniform structure offer an alternative, since the as-grown SWCNT networks have a preferentially oriented and firmly connected reticulate architecture ( Figure 1(e)) [16], which can provide continuous load-transfer pathways. For a 200 nm thick film, the tensile strength is 300-400 MPa (Figure 3(b)) [124], which is 30 times higher than that of typical "bucky paper" and 10 times higher than that of sheets with nitric acid treatment [125]. The densitynormalized stress is 280 MPa g 1 cm 3 , which is higher than that of undensified MWCNT sheets drawn from nanotube arrays but lower than that of densified MWCNT sheets [49].…”

Section: Mechanical Properties and Micromechanical Analysismentioning

confidence: 90%

“…Ma et al [124] have applied Raman tests to characterize the micromechanical process in strained SWCNT films and fibers. The down-shifting trend of the peak position and the asymmetrical broadening of the line shape after strain are the major characteristics of the Raman spectra for both types of specimens (Figure 4).…”

Section: Mechanical Properties and Micromechanical Analysismentioning

confidence: 99%

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Freestanding single-walled carbon nanotube bundle networks: Fabrication, properties and composites

Zhou

Niu

et al. 2011

Chin. Sci. Bull.

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As a type of thin film, two dimensional (2D) reticulate architectures built of freestanding single-walled carbon nanotube (SWCNT) bundles are suitable for scalable integration into devices and nanocomposites for many applications. The superior properties of these films, such as optical transparency, unique electrical properties and mechanical flexibility, result not only from the outstanding properties of individual SWCNTs but also from the collective behavior of the individual tubes, with additional properties arising from the tube-tube interactions. In this review, the synthesis, structure and fundamental properties, such as conductivity, transparency, optical nonlinearity and mechanical performance, of "freestanding SWCNT bundle network" thin films and nanocomposites, as well as their application as supercapacitors are highlighted. Some long-standing problems and topics warranting further investigation in the near future are addressed. single-walled carbon nanotube (SWCNT), SWCNT bundle network, nanocomposites, multifunctional thin film, supercapacitors Citation:Zhou valently bonded carbon network gives rise to an extremely stable structure, arguably the strongest in nature. The axial Young's modulus has been determined experimentally by several means [6 -11] and is typically between 1-1.8 TPa.The fracture stresses of SWCNT bundles can reach as high as 50 GPa [8,12], which corresponds to a density-normalized strength ~50 times larger than that of steel wires [7]. In addition, the properties of SWCNTs are very sensitive to chemical modification or atomic doping -these processes can give rise to brand-new 1D materials that promise remarkable application. To fully utilize the excellent mechanical and physical properties of individual SWCNTs, various types of SWCNT architectures with different dimensions, including 1D nanotubes or bundles, 2D thin films or networks or papers, and 3D arrays or sponges, have been synthesized and investigated worldwide. Unlike an isolated 1D nanotube, a 2D thin film made up of thousands of SWCNTs exhibits collective behavior, which has an advantage of statistically better reproducibility, making it suitable for scalable integration into devices, nanocomposites and for many applications. Its superior properties, such as optical transparency, unique electric properties and mechanical flexibility, result not only from

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Section: Mechanical Properties and Micromechanical Analysismentioning

confidence: 90%

Section: Mechanical Properties and Micromechanical Analysismentioning

confidence: 99%

Freestanding single-walled carbon nanotube bundle networks: Fabrication, properties and composites

Zhou

Niu

et al. 2011

Chin. Sci. Bull.

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“…CNT yarns are composed of carbon nanotubes and could be fabricated using four methods: spinning from CNT forest initially grown on a substrate, spinning directly from a CNT aerogel formed from Chemical Vapor Deposition (CVD) process, spinning from a polymer solution containing polyvinylalcohol (PVA), and spinning from CNT films [4][5][6][7][8][9]. In order to increase compaction within the yarns or the van der Waals forces between individual CNTs, a post-treatment process is required by adding a solvent and evaporating it.…”

Section: Introductionmentioning

confidence: 99%

Piezoresistive Response of Integrated CNT Yarns under Compression and Tension: The Effect of Lateral Constraint

Anike¹,

Le²,

Brodeur³

et al. 2017

Preprint

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Carbon nanotube (CNT) yarns are fiber-like materials that exhibit excellent mechanical, electrical and thermal properties. More importantly, they exhibit a piezoresistive response that can be tapped for sensing purposes. The objective of this study is to determine experimentally the piezoresistive response of CNT yarns that are embedded in a polymeric medium while subjected to either compression or tension, and compare it with that of the free or unconstrained CNT yarns. The rationale for this study is the need to know the piezoresistive response of the CNT yarn while in a medium, which provides a lateral constraint to the CNT yarn thus mimicking the response of integrated CNT yarn sensors. The experimental program includes the fabrication of samples and their electromechanical characterization. The CNT yarns are integrated in polymeric beams and subjected to four-point bending allowing the determination of their response under tension and compression. The electromechanical data from a combined Inductance-Capacitance-Resistance (LCR) device and a mechanical testing system were used to determine the piezoresistive response of the CNT yarns. At a strain rate of 0.006 min -1 , the gauge factors obtained under tension for a maximum strain of 0.1 % is ~ 29.3 which is higher than ~ 21.2 obtained under compression. The CNT yarn sensor exhibited strain rate dependence with a gauge factor of approximately 23.0 at 0.006 min -1 , in comparison to 19.0 and 1.3, which were obtained at 0.0005 min -1 and 0.003 min -1 , respectively. There is a difference of up to two orders of magnitude in the sensitivity of the constrained CNT yarn under bending with respect to that of the free CNT yarn under uniaxial tension. However, the difference becomes smaller when the constrained CNT yarn was tested under uniaxial tension. This data and information will be used for future modeling efforts and to study the phenomena that occur when CNT yarns are integrated in polymeric and composite materials and structures.

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“…It has been shown that the increase in diameter of CNT yarns would decrease the mechanical properties of CNT yarns. 18 Several studies have shown that mechanical properties of CNT yarns are significantly lower than the individual CNTs, which may be due to the lack of lateral forces (weak van der Waals forces) between the CNTs and sliding of CNTs under the applied forces. 6,8,9 In an effort to improve mechanical (e.g., fatigue, creep, stiffness, and strength), as well as other physical (e.g., magnetic, electrical, thermal, and optical), chemical, and physicochemical properties of CNT yarns, the scientific community has been investigating the CNTs and their products.…”

Section: Introductionmentioning

confidence: 99%

Tensile behavior of carbon nanotube multi-yarn coated with polyester

Misak

Asmatulu

Mall

2014

Journal of Composite Materials

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The behavior of a carbon nanotube (CNT) multi-yarn consisting of 30 yarns and coated with a thin layer of polyester is investigated under tensile loading condition. The coated and uncoated CNT multi-yarns are loaded until fracture occurred inside a scanning electron microscope. In situ photographs were undertaken to investigate the helix angle, diameter, yarn twist, and damage and failure mechanisms. The coated CNT multi-yarn has a higher ultimate tensile strength than the uncoated counterpart. The coated multi-yarn fails at a single location and remains tight after the failure. The uncoated yarn fails at multiple locations along its length and also unravels. The adhesive coating adheres to the CNT yarn surface and does not penetrate into the yarn. These results provide insights into how CNT multi-yarn would behave when used as the reinforcement in the nanocomposites.

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Monitoring a Micromechanical Process in Macroscale Carbon Nanotube Films and Fibers

Cited by 154 publications

References 22 publications

Freestanding single-walled carbon nanotube bundle networks: Fabrication, properties and composites

Freestanding single-walled carbon nanotube bundle networks: Fabrication, properties and composites

Piezoresistive Response of Integrated CNT Yarns under Compression and Tension: The Effect of Lateral Constraint

Tensile behavior of carbon nanotube multi-yarn coated with polyester

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