Study on Raman multi-peak fitting and structure quantitative analysis of PAN-based carbon fibers

Effect of electrophoretic deposition of micro-quartz on the microstructural and mechanical properties of carbon fibers and their bond performance toward cement

“…Thus, the latter is believed to be particularly sensitive to defects in the carbon system. In the context of exploring mechanical properties of CF [13,53,54] and other carbon allotropes [55], particularly the intensity ratio of D to G peak has been used as a measure for monitoring changes in the carbon structure.…”

Controllable Fabrication of Hydrophilic Surface Micro/Nanostructures of CFRP by Femtosecond Laser

“…The Raman spectrum of the exposed carbon fiber after femtosecond laser processing shows three Raman modes at 1347, 1585, and 2700 cm –1 , respectively, assigned to the D-peak, G-peak, and 2D-peak. The D-peak was a disorder-induced peak and corresponded to the disordered graphitic lattice (A 1g symmetry), which was attributed to the reduced symmetry of the graphite lattice near edges ( sp 3 carbon atoms). , The G-peak corresponded to the ideal graphitic lattice (E 2g symmetry), which was attributed to the in-plane vibration of the sp 2 carbon atoms. , The 2D-peak was attributed to the first overtone of the D-peak, and could reflect the degree of perfection of the graphite lamellar structure. , The ratio of the intensities of the D-peak and G-peak, I D / I G , has been widely utilized to characterize the degree of structural disorder . In the process of femtosecond laser processing CFRP, the ratio of the intensities of the D-peak and G-peak (I D /I G ) increased with the increase of the laser pulse energy, as shown in Figure b, which indicated the increase of the degree of structural disorder.…”

Atomistically informed hierarchical modeling for revisiting the constituent structures from heredity and nano–micro mechanics of sheath-core carbon fiber

“…Modifications: hybrid harmonic and modified logistic Additional modifications: truncated and shifted forces Angle bending (c) Quadratic: E a = K y  (y À y 0 ) 2 Coulomb potential: E c ðrÞ ¼ 322:0637q i q j Er ij Dihedral torsion Harmonic style:…”

“…To access high fidelity engineering constants for the rational design of highly anisotropic and turbostratic carbon fibers, methods have branched into direct experimental approaches and the indirect bottom-up cascade predicting scheme, which introduces the underlying nano-scale structural features into the existing molecular dynamics (MD) or the micromechanical homogenization framework. Direct experimental characterization approaches, such as nanoindentation, Raman spectroscopy multi-peak fitting, 1,2 single filament micropillar compression, 3 and laser resonant ultrasound or torsion tests, 4 will be inefficient for parametric studies, which consume huge efforts. The methods also suffer from complicated data interpretation and require specialized instruments in measuring the off-axis properties of carbon fiber.…”