Effect of amorphous carbon on the tensile behavior of polyacrylonitrile (PAN)-based carbon fibers

Yang, Fenghao; Hu, Guangmin; He, Haoyuan; Yi, Maozhong; Ge, Yicheng; Ran, Liping; Peng, Ke

doi:10.1007/s10853-018-03256-z

Cited by 52 publications

(22 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the case of a disordered sample or at the edge of a graphene sample, we can also see the so-called disorder-induced D peak . The increased D peak area of the 3D-graphene/AC system is caused by defects in the AC layer . Details about the synthesis of 3D-graphene on both template layers are presented in Figure S1 of the Supporting Information.…”

Section: Resultsmentioning

confidence: 99%

“…28 The increased D peak area of the 3D-graphene/AC system is caused by defects in the AC layer. 29 Details about the synthesis of 3D-graphene on both template layers are presented in Figure S1 of the Supporting Information. We further explored the contact potential distributions (CPDs) of the two types of 3D-graphene-based heterojunctions using scanning Kelvin probe microscopy (SKPM).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of a Highly Sensitive Surface-Enhanced Raman Scattering Substrate Formed by a Three-Dimensional/Two-Dimensional Graphene/Germanium Heterostructure

Wang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Three-dimensional graphene (3D-graphene) is used in surface-enhanced Raman spectroscopy (SERS) because of its plasmonic nanoresonator structure and good ability to interact with light. However, a thin (3−5 nm) layer of amorphous carbon (AC) inevitably appears as a template layer between the 3D-graphene and object substrate when the 3D-graphene layer is synthesized, weakening the enhancement factor. Herein, two-dimensional graphene (2D-graphene) is employed as a template layer to directly synthesize 3D-graphene on a germanium (Ge) substrate via plasma-assisted chemical vapor deposition, bypassing the formation of an AC layer. The interaction and photoinduced charge transfer ability of the 3D-graphene/Ge heterojunction with incident light are improved. Moreover, the high density of electronic states close to the Fermi level of the heterojunction induces the adsorbed probe molecules to efficiently couple to the 3D-graphene-based SERS substrate. Our experimental results imply that the lowest concentrations of rhodamine 6G and rhodamine B that can be detected on the 3D/2D-graphene/Ge SERS substrate correspond to 10 −10 M; for methylene blue, it is 10 −8 M. The detection limits of the 3D/2D-graphene/Ge SERS substrate with respect to 3-hydroxytyramine hydrochloride and melamine (in milk) are both less than 1 ppm. This work may provide a viable and convenient alternative method for preparing 3D-graphene SERS substrates. It also constitutes a new approach to developing SERS substrates with remarkable performance levels.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Investigation of a Highly Sensitive Surface-Enhanced Raman Scattering Substrate Formed by a Three-Dimensional/Two-Dimensional Graphene/Germanium Heterostructure

Wang

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The CF surface microstructure contains not only the grooves (tens of nm or even bigger), but also lots of defects (a few nm or smaller), as shown in Figure 12 a. In fact, a lot of defects, such as gaps, uneven microstructures, micro cracks, punctures and diametrical bulges, are on the CF surface [ 38 , 39 , 40 ]. These defects are much smaller than grooves, but their number is much more than the number of grooves.…”

Section: Resultsmentioning

confidence: 99%

Effect of Carbon Fiber Surface Microstructure on Composite Interfacial Property Based on Image Quantitative Characterization Technique

2021

View full text Add to dashboard Cite

The surface roughness (Ra) and composite interfacial property of carbon fiber (CF) are considered to be mainly affected by the microstructure of the CF surface. However, quantitative characterization of the CF surface microstructure is always a difficulty. How the CF surface microstructure affects the interfacial property of CF composites is not entirely clear. A quantitative characterization technique based on images was established to calculate the cross-section perimeter and area of five types of CFs, as well as the number (N), width (W) and depth (D) of grooves on these CF surfaces. The CF composite interfacial shear strength (IFSS) was tested by the micro-droplet debonding test and modified by the realistic perimeter. The relationship between the groove structure parameter and the Ra, specific surface area and composite interfacial property was discussed in this article. The results indicated that the CF cross-section perimeter calculated by this technique showed strong consistency with the CF specific surface area and composite interfacial property. At last, the composite interface bonding mechanism based on defect capture was put forward. This mechanism can be a guiding principle for CF surface modification and help researchers better understand and establish interface bonding theories.

show abstract

“…The former was related to the A1g vibration pattern of sp 3 bonded hybridized carbon atoms in carbon materials, presenting the defect sites in carbon network, as well as asymmetry and disorder structures in PAN fibers. 6,30,31 G-Line at about 1590 cm À1 is corresponded to the E2g vibration mode of sp 2 carbon atom sites in carbon materials, presenting highly symmetrical and ordered structure in the aromatic layers. A-Line at about 1500 cm À1 is attributed to the vibration mode of amorphous carbonaceous structure.…”

Section: The Carbon Microstructure Evolution Of Pan Fibers During Hea...mentioning

confidence: 98%

“…5 Considering the poor thermal conductivity of PAN fibers, stepwise heating mode 8 is widely used in the actual industrial production process in order to avoid heat accumulation caused by long-term isothermal heating mode which would result in the decrease of fiber quality. Due to the limitations of experimental conditions and the difficulties in controlling the key experimental parameters, most studies only focused on the evolution of the microstructure and mechanical properties 5,6,30 at a certain stage or single process. In contrast, few studies mimic the actual industrial manufacture process to discuss the detailed changes of the fiber structure and mechanical properties in each stage of the continuous stepwise heat treatment, despite its significance for us to fully understand the nature of structural evolution and mechanical property changes.…”

Section: Introductionmentioning

confidence: 99%

Study on the structural evolution of polyacrylonitrile fibers in stepwise heat treatment process and its relationship with properties

Liu

Shang

2021

J of Applied Polymer Sci

View full text Add to dashboard Cite

The structural evolution of polyacrylonitrile fibers in stepwise heat treatment process and its relationship with properties were investigated systematically.Results demonstrated that the cyclization degree and dehydrogenation index of fibers reached 84.13% and 1.361, respectively after stabilization at 265 C.The oxygen reaction was enhanced after stabilized at 245 C. Refinement of the microcrystalline structure took effect during stabilization and low temperature carbonization, while growth of microcrystalline dominated during high temperature carbonization. The results of surface topography study not only provided the evolution characteristics of surface microstructure under the influence of chemical reaction, but also further complements the internal aggregation structural rearrangement process from the side. Additionally, the temperature zone from 245 to 265 C was the key stage of the formation of the skin-core structure, which would be transmitted to the resultant carbon fiber.Tensile strength and tensile modulus decreased during stabilization stage, reaching 4.273 GPa and 221.132 GPa, respectively after high temperature carbonization. The elongation at break which first increased and then decreased proved a toughness failure to brittleness failure. The investigation elucidated the relationship between the mechanical property with chemical and physical microstructure. And the possible rearrangement process of the aggregation structure was proposed.

show abstract

Effect of amorphous carbon on the tensile behavior of polyacrylonitrile (PAN)-based carbon fibers

Cited by 52 publications

References 38 publications

Investigation of a Highly Sensitive Surface-Enhanced Raman Scattering Substrate Formed by a Three-Dimensional/Two-Dimensional Graphene/Germanium Heterostructure

Investigation of a Highly Sensitive Surface-Enhanced Raman Scattering Substrate Formed by a Three-Dimensional/Two-Dimensional Graphene/Germanium Heterostructure

Effect of Carbon Fiber Surface Microstructure on Composite Interfacial Property Based on Image Quantitative Characterization Technique

Study on the structural evolution of polyacrylonitrile fibers in stepwise heat treatment process and its relationship with properties

Contact Info

Product

Resources

About