Densification mechanism of polyacrylonitrile-based carbon fiber during heat treatment

Gao, Aijun; Su, Canjun; Luo, Sha; Tong, Yuanjian; Xu, Lianyong

doi:10.1016/j.jpcs.2011.07.008

Cited by 27 publications

(16 citation statements)

References 18 publications

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“…8 and 9. The G, D, and 2D bands corresponding to the sp 2 -hybridized and disordered carbons clearly appeared at 1350, 1604, and 2700 cm À1 in all the Raman spectra, respectively, and their intensities were increased with an increase in the carbonization temperature [40]. The D-band to G-band intensity ratios (I D /I G ) of the formed carbon films were decreased by as much as 0.81 with an increase in the carbonization temperature due to the better formation of ordered graphitic structures at a higher temperature.…”

Section: Fabrication Of Gcms By Ion Beam Contact Lithography and Carbmentioning

confidence: 95%

A simple PAN-based fabrication method for microstructured carbon electrodes for organic field-effect transistors

Jung

Kim

Jung

et al. 2015

Carbon

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Section: Fabrication Of Gcms By Ion Beam Contact Lithography and Carbmentioning

confidence: 95%

A simple PAN-based fabrication method for microstructured carbon electrodes for organic field-effect transistors

Jung

Kim

Jung

et al. 2015

Carbon

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“…Temperatures of 1400 °C and above result in graphitic fibres with less content of nitrogen or hydrogen . Because the highly graphitic carbon fibres is formed by the temperature increase, crystallite thickness size and orientation increases and the interlayer spacing between the single graphene planes are reduced . The enhanced crystal growth is different for the single crystallite dimensions.…”

Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 99%

“…The longitudinal crystallite growth is enhanced by crosslinking with other graphite planes. Crystal thickness is growing by assembling further graphene planes . All crystal dimensions asymptotically grow with the temperature.…”

Section: Process‐structure‐relations and Their Technical Potentialsmentioning

confidence: 99%

Influence of processing parameters on the properties of carbon fibres – an overview

Jäger

Cherif

Kirsten

et al. 2016

Materialwissenschaft Werkst

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Several studies have shown the importance of carbon fibres (CF) for different high technology markets. In recent years, different fibre types with improved properties have been developed for those markets. Polyacrylonitrile (PAN) copolymers are the basic raw material (precursor) for these fibres in the predominant case. Improvements of the mechanical fibre properties have mainly been achieved by defect reduction during the manufacturing process. Thus, commercial carbon fibres with tensile strengths up to approx. 7000 MPa are currently available. It can be shown that the strengths can be further increased (in the direction of graphene properties) when the relationship between process conditions and defects due to manufacturing of the fibres is better understood. In this context, novel processes like electron beam crosslinking or UV‐activation have proven to be very promising. The article gives an overview about the current situation in the field of carbon fibres development and particularly shows recent shortcomings with respect to novel applications.

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“…5, the majority of BG nanoparticles had migrated to the outside of nanobers and only a few of particles stayed inside the nano-bers. 35,36 The densication was determined by both the rate of denitrogenation and the rearrangement of carbon atoms, which were proportional to sintering temperature. The BG nanoparticles of CNF/BG-1200 presented cuboid-like geometry at sintering time points of 1 h and 2 h (Fig.…”

Section: Morphology Evolution Of Pan/bg Precursor Composite Nanobersmentioning

confidence: 99%

Growth mechanism of bioglass nanoparticles in polyacrylonitrile-based carbon nanofibers

et al. 2014

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Polyacrylonitrile (PAN) electrospinning in combination with sol-gel method has been a common technique to produce inorganic nanoparticles containing composite carbon nanofibers (CNFs) for diverse applications. To investigate the morphology evolution and crystal transformation of inorganic components along with CNF formation, bioactive glass (BG) containing CNFs (CNF/BG) were prepared by sintering as-spun PAN/precursor composite nanofibers in a nitrogen atmosphere at temperatures of 800, 1000 and 1200 C. Comprehensive characterizations were performed with TEM, SEM-EDXA and XRD. For samples sintered at 800 C, numerous BG nanoparticles were observed inside the CNFs and mainly in an amorphous state. With the sintering temperature raised to 1000 C, a number of spherical BG nanoparticles were detected on the surface of the resulting CNFs, with a crystal structure of wollastonite (b-CaSiO 3 ) polycrystals. When the samples were sintered at 1200 C, the BG nanoparticles on the surface of CNFs merged into forms with cuboid-like geometry, mainly consisting of pseudowollastonite (Ca 3 (Si 3 O 9 )) single crystals. Based on the geometry evolution and dynamic size distribution function analyses (Ostwald ripening and Smoluchowski equations), it was concluded that the growth of BG nanoparticles conformed to the ripening mechanism at 800 C and migrationcoalescence mechanism at 1200 C, while the process involved both ripening and migrationcoalescence mechanisms at 1000 C.

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Densification mechanism of polyacrylonitrile-based carbon fiber during heat treatment

Cited by 27 publications

References 18 publications

A simple PAN-based fabrication method for microstructured carbon electrodes for organic field-effect transistors

A simple PAN-based fabrication method for microstructured carbon electrodes for organic field-effect transistors

Influence of processing parameters on the properties of carbon fibres – an overview

Growth mechanism of bioglass nanoparticles in polyacrylonitrile-based carbon nanofibers

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