Activation effect of porous structure on fluorination of graphene based materials with large specific surface area at mild condition

Wang, Xu; Wang, Weimiao; Xu, Dazhou; Lai, Wenchan

doi:10.1016/j.carbon.2017.08.076

Cited by 38 publications

(31 citation statements)

References 21 publications

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“…Fluorographene is the structure of fully or partially fluorinated graphene. Fluorination and exfoliation are two dominating kinds of methods for producing fluorographene [143][144][145][146]. As a nanoscale 2D material, the edge effect is significant including its energy and stress.…”

Section: Fluorographenementioning

confidence: 99%

A Review of Current Development of Graphene Mechanics

et al. 2018

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Graphene, a two-dimensional carbon in honeycomb crystal with single-atom thickness, possesses extraordinary properties and fascinating applications. Graphene mechanics is very important, as it relates to the integrity and various nanomechanical behaviors including flexing, moving, rotating, vibrating, and even twisting of graphene. The relationship between the strain and stress plays an essential role in graphene mechanics. Strain can dramatically influence the electronic and optical properties, and could be utilized to engineering those properties. Furthermore, graphene with specific kinds of defects exhibit mechanical enhancements and thus the electronic enhancements. In this short review, we focus on the current development of graphene mechanics, including tension and compression, fracture, shearing, bending, friction, and dynamics properties of graphene from both experiments and numerical simulations. We also touch graphene derivatives, including graphane, graphone, graphyne, fluorographene, and graphene oxide, which carve some fancy mechanical properties out from graphene. Our review summarizes the current achievements of graphene mechanics, and then shows the future prospects.

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Section: Fluorographenementioning

confidence: 99%

A Review of Current Development of Graphene Mechanics

et al. 2018

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“…Based on previous research of our group, controlled fluorination of MWCNTs shell by two‐stage direct heating fluorination process can be realized, and FCNT with high fluorine content can be prepared . Element composition and structure of FCNT were characterized by XPS and TEM, as shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Improving Compressive Strength of Aramid Fiber by Introducing Carbon Nanotube Derivates Grafted with Oligomers of Different Conformations and Controlling Its Alignment

Yao

Dai

Meng

et al. 2019

Macro Materials & Eng

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Low compressive strength of aramid fiber is one of the most prominent obstacles for its application as a strengthening material. Herein, based on nucleophilic reaction of CF bonds, fluorinated carbon nanotube (FCNT) derivates grafted with oligomers of different conformations are prepared to modify (Poly‐p‐phenylene‐benzimidazole‐terephthalamide) (PBIA) fiber. CF bonds of FCNT can react with benzimidazole units and terminal amino groups of PBIA oligomers. Therefore, FCNT derivates grafted with oligomers of different conformations can be obtained. Then, the FCNT derivates are blended with PBIA solution to prepare PBIA/FCNT composite fibers. Compressive strength is improved by nearly 34.7% and 107% for the fiber modified by FCNT derivates grafted with oligomers of parallel and vertical conformations, respectively. It is found that FCNT derivates grafted with oligomers of vertical conformation may be forced to be aligned vertically to axis of the fiber, which is more beneficial to improve lateral interaction and compressive strength of the fiber.

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“…However, in most instances, the corresponding vibration peak contains at least two peaks located at 1050-1220 cm −1 , indicating the existence of multiple types of CF bonds. [102,108,125,137,[146][147][148] Until now, it has been semiempirically accepted that the bonding energy of covalent CF bond is around 290-291 eV while that of the semi-ionic CF bond is around 287-288 eV in the XPS C 1s spectra. [30,108,125,126,131,138] However, due to the complexity of the fluorination, all the abovementioned types of CF bonds may coexist in the FG sheets, which brings tremendous difficulties for exploring the properties of these different types of CF bonds, respectively.…”

Section: Intrinsic Properties Of Fgmentioning

confidence: 99%

“…[102,108,125,137,[146][147][148] Until now, it has been semiempirically accepted that the bonding energy of covalent CF bond is around 290-291 eV while that of the semi-ionic CF bond is around 287-288 eV in the XPS C 1s spectra. [30,108,125,126,131,138] However, due to the complexity of the fluorination, all the abovementioned types of CF bonds may coexist in the FG sheets, which brings tremendous difficulties for exploring the properties of these different types of CF bonds, respectively. Some researchers believed that there were no multiple types of CF bonds on the FG plane, which was only resulted from the hyperconjugation interaction between the different aromatic regions and the fluorinated regions.…”

Section: Intrinsic Properties Of Fgmentioning

confidence: 99%

“…Furthermore, the CF bonds on graphene plane greatly increased the out-plane bending stiffness of graphene, and guaranteed the flat state of FG sheet which facilitates the direct solid molding of FG through the layer-by-layer compact stacking. [198] However, the CF bonds at defects have little ability of increasing the out-plane [125] Copyright 2017, Elsevier. Image for "Phase region" in (B): Reproduced with permission.…”

Section: Fluorine Distributionmentioning

confidence: 99%

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