Deriving structural perfection in the structure of polyacrylonitril-based electrospun carbon nanofibers

Kim, Doo-Won; Kim, Chang Hyo; Yang, Cheol‐Min; Ahn, Seokhoon; Kim, Yang Hui; Hong, Su Hyung; Kim, Kyung Soo; Hwang, Jun Yeon; Choi, Go Bong; Kim, Yoong Ahm; Yang, Kap Seung

doi:10.1016/j.carbon.2019.02.066

Cited by 15 publications

(11 citation statements)

References 8 publications

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“…A high alignment of polymer chain in as-spun nanofibers is the prerequisite for the high strength and modulus of the final CNFs [135]. During the spinning, the solvent evaporates and the chains get a certain aligning during a well-designed drawing process, as illustrated by the aligning procedure in Fig.…”

Section: Stretchingmentioning

confidence: 99%

“…Thus nanofibers containing stretched and aligned polymer chains can be obtained, and converted into strengthened CNFs by forming graphitic structures with high orientation along the fiber axis in the later thermal treatments. To realize efficient stretching, Kim et al [135] paid attention to the effect of take-up (spinning) speed on morphological variation of polyacrylonitrile based electrospun carbon nanofibers. They found that the fibers easily form a heterogeneous structure consisting of polymer-rich and solvent-rich phases when using a relatively low extensional shear rate during the electrospinning.…”

Section: Stretchingmentioning

confidence: 99%

“…Smit et al [73] designed a water reservoir collector where the as-spun nonwoven nanofiber webs were formed on the water surface and then collected by drawing into continuous uniaxial fiber bundles (yarns). Liu et al [136] where the treatments of aligning and stretching are important [135]. b, c Schematics showing the collection of nanofibers using a rotating drum (b) and a flowing water bath (c) [136].…”

Section: Stretchingmentioning

confidence: 99%

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Strategies in Precursors and Post Treatments to Strengthen Carbon Nanofibers

Zhang

Liu

et al. 2020

Adv. Fiber Mater.

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The limited mechanical properties of carbon nanofibers (CNFs) have become a severe problem hindering their wide range applications. The restricting issues are found in the whole fabrication process, including the precursor design, spinning and collection techniques, post treatments like stretching and aligning, and complicated thermal treatments involving stabilization and carbonization. Here we access the CNF development by focusing on the mechanical properties, and systematically discuss the strengthening strategies during the different fabrication stages.

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Section: Stretchingmentioning

confidence: 99%

Section: Stretchingmentioning

confidence: 99%

Section: Stretchingmentioning

confidence: 99%

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Strategies in Precursors and Post Treatments to Strengthen Carbon Nanofibers

Zhang

Liu

et al. 2020

Adv. Fiber Mater.

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“…Morphological transformation of PAN solution to electrospun carbon nanofibers. 65 PAN = Polyacrylonitrile; DMSO = dimethylsulfoxide. Reproduced with permission from Elsevier.…”

Section: Physical Properties and Morphological Variations Of Nanocompmentioning

confidence: 99%

“…The non-homogeneous nanoparticle dispersion was obviously credited to the poor interactions between the PS and MWCNT. Kim et al 65 prepared polyacrylonitrile (PAN)-based carbon nanofibers via electrospinning. In these nanofibers, the polyacrylonitrile nanofiber morphology was controlled via the stretching process, viscosity, and spinneret speed.…”

Section: Physical Properties and Morphological Variations Of Nanocompmentioning

confidence: 99%

Polymeric nanocomposite via electrospinning: Assessment of morphology, physical properties and applications

Kausar

2020

Journal of Plastic Film & Sheeting

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Polymeric nanofibers have appeared as unique one-dimensional nanomaterials. Nanofibers possess exceptionally high specific surface area and essential properties. Various polymeric nanofibers and nanocomposite nanofibers have been developed using thermoplastic and thermosetting matrices and organic and inorganic nanoparticles. This review documents the worth of nanofiber technology regarding the synthesis, morphology, physical properties, and applications of the nanostructures. The nanofiber surface morphology and diameter directly influence the physical characteristics such as electrical conductivity, mechanical properties, and thermal stability. Fiber processing techniques and related parameters also affect their texture and properties. In this regard, electrospinning is frequently used to form polymeric nanofibers and nanocomposite nanofibers. Electrospun nanofibers having large surface area and excellent fiber orientation, alignment, and morphology. The polymer nanocomposites with different nanofillers (carbon nanotube, graphene, carbon nanofibers, and other nanoparticles) have been processed into high performance electrospun nanofibers. Electrospun nanomaterials have been applied in engineered structures, nanofibrous membranes, electronic devices, tissue engineering, drug delivery, antibacterial materials and other biomedical applications. Henceforth, this is a comprehensive review on physical characteristics, morphology, processing aspects, and application areas for polymeric and nanocomposite nanofibers.

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Carbonization‐Temperature‐Dependent Electrical Properties of Carbon Nanofibers—From Nanoscale to Macroscale

et al. 2023

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An exact understanding of the conductivity of individual fibers and their networks is crucial to tailor the overall macroscopic properties of polyacrylonitrile (PAN)‐based carbon nanofibers (CNFs). Therefore, microelectrical properties of CNF networks and nanoelectrical properties of individual CNFs, carbonized at temperatures from 600 to 1000 °C, are studied by means of conductive atomic force microscopy (C‐AFM). At the microscale, the CNF networks show good electrical interconnections enabling a homogeneously distributed current flow. The network's homogeneity is underlined by the strong correlation of macroscopic conductivities, determined by the four‐point‐method, and microscopic results. Both, microscopic and macroscopic electrical properties, solely depend on the carbonization temperature and the exact resulting fiber structure. Strikingly, nanoscale high‐resolution current maps of individual CNFs reveal a large highly resistive surface fraction, representing a clear limitation. Highly resistive surface domains are either attributed to disordered highly resistive carbon structures at the surface or the absence of electron percolation paths in the bulk volume. With increased carbonization temperature, the conductive surface domains grow in size resulting in a higher conductivity. This work contributes to existing microstructural models of CNFs by extending them by electrical properties, especially electron percolation paths.

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Deriving structural perfection in the structure of polyacrylonitril-based electrospun carbon nanofibers

Cited by 15 publications

References 8 publications

Strategies in Precursors and Post Treatments to Strengthen Carbon Nanofibers

Strategies in Precursors and Post Treatments to Strengthen Carbon Nanofibers

Polymeric nanocomposite via electrospinning: Assessment of morphology, physical properties and applications

Carbonization‐Temperature‐Dependent Electrical Properties of Carbon Nanofibers—From Nanoscale to Macroscale

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