Precise Control of the Number of Layers of Graphene by Picosecond Laser Thinning

Lin, Zhe; Ye, Xiaohui; Han, Jinpeng; Qiao, Chen; Fan, Peixun; Zhang, Hongjun; Xie, Dan; Zhu, Hongwei; Zhong, Minlin

doi:10.1038/srep11662

Cited by 97 publications

(65 citation statements)

References 22 publications

(33 reference statements)

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“…The 2D (or 2D’) peak does not require a defect for its activation, because it originates from the two iTO phonons with opposite momentum near Brillouin zone [ 43 , 44 , 45 ]. The position, full width at high maximum (FWHM), intensity ratio ( I 2D / I G ), and Lorentzian fittings of the 2D peak provide good correlation with the number of layers of graphene in a flake sample [ 43 , 44 , 45 , 46 , 47 ]. In Figure 4 bI, the 2D-band of graphene sample is fitted by five Lorentzians, with an overall FWHM of 65.52 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Advancing the Use of High-Performance Graphene-Based Multimodal Polymer Nanocomposite at Scale

Ahmad

Kozioł

Deveci³

et al. 2018

Nanomaterials

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The production of an innovative, high-performance graphene-based polymer nanocomposite using cost-effective techniques was pursued in this study. Well-dispersed and uniformly distributed graphene platelets within a polymer matrix, with strong interfacial bonding between the platelets and the matrix, provided an optimal nanocomposite system for industrial interest. This study reports on the reinforcement of high molecular weight multimodal-high-density polyethylene reinforced by a microwave-induced plasma graphene, using melt intercalation. The tailored process included designing a suitable screw configuration, paired with coordinating extruder conditions and blending techniques. This enabled the polymer to sufficiently degrade, predominantly through thermomechanical-degradation, as well as thermo-oxidative degradation, which subsequently created a suitable medium for the graphene sheets to disperse readily and distribute evenly within the polymer matrix. Different microscopy techniques were employed to prove the effectiveness. This was then qualitatively assessed by Raman spectroscopy, X-ray diffraction, rheology, mechanical testing, density measurements, thermal expansion, and thermogravimetric analysis, confirming both the originality as well as the effectiveness of the process.

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Section: Resultsmentioning

confidence: 99%

Advancing the Use of High-Performance Graphene-Based Multimodal Polymer Nanocomposite at Scale

Ahmad

Kozioł

Deveci³

et al. 2018

Nanomaterials

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“…Similar to graphene, GO is highly transparent in the visible spectrum, the degree of transparency being attributed to electrostatic, chemical, van der Waals interactions and others that, remain largely unknown[ 59 ]. However, the transparency of graphene oxide decreases as a function of its number of layers[ 60 ]. Therefore, these new alginate composites are much darker because they have folded 3D GO networks instead of uncrosslinked GO sheets.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of irregular graphene oxide tubes using green chemistry and their potential use as reinforcement materials for biomedical applications

Serrano‐Aroca

Deb

2017

PLoS ONE

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Micrometer length tubes of graphene oxide (GO) with irregular form were synthesised following facile and green metal complexation reactions. These materials were obtained by crosslinking of GO with calcium, zinc or strontium chlorides at three different temperatures (24, 34 and 55°C) using distilled water as solvent for the compounds and following a remarkably simple and low-cost synthetic method, which employs no hazardous substances and is conducted without consumption of thermal or sonic energy. These irregular continuous GO networks showed a very particular interconnected structure by Field Emission Scanning Electron Microscopy with Energy-Disperse X-Ray Spectroscopy for elemental analysis and High-resolution Transmission Electron Microscopy with Scanning Transmission Electron Microscope Dark Field Imaging, and were analysed by Raman Spectroscopy. To demonstrate the potential use of these 3D GO networks as reinforcement materials for biomedical applications, two composites of calcium alginate with irregular tubes of GO and with single GO nanosheets were prepared with the same amount of GO and divalent atoms and analysed. Thus, the dynamic-mechanical modulus of the composites synthesised with the 3D crosslinked GO networks showed a very significant mechanical improvement due to marked microstructural changes confirmed by confocal microscopy, differential scanning calorimetry and Fourier transform infrared spectroscopy.

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“…For e.g. Lin et al [148] used a picosecond laser to remove graphene layers from multi-layered graphene films. As both the lateral size and the crystallinity of the starting graphite influenced the number of graphene layers obtained by chemical exfoliation, Wu et al [149] successfully tuned the number of graphene layers by selecting appropriate starting materials from artificial graphite, flake graphite powder, Kish graphite, and natural flake graphite.…”

Section: The Structure Of Graphenementioning

confidence: 99%

Structure of graphene and its disorders: a review

Gao

Lee

et al. 2018

Science and Technology of Advanced Materials

447

187

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Monolayer graphene exhibits extraordinary properties owing to the unique, regular arrangement of atoms in it. However, graphene is usually modified for specific applications, which introduces disorder. This article presents details of graphene structure, including sp2 hybridization, critical parameters of the unit cell, formation of σ and π bonds, electronic band structure, edge orientations, and the number and stacking order of graphene layers. We also discuss topics related to the creation and configuration of disorders in graphene, such as corrugations, topological defects, vacancies, adatoms and sp3-defects. The effects of these disorders on the electrical, thermal, chemical and mechanical properties of graphene are analyzed subsequently. Finally, we review previous work on the modulation of structural defects in graphene for specific applications.

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Precise Control of the Number of Layers of Graphene by Picosecond Laser Thinning

Cited by 97 publications

References 22 publications

Advancing the Use of High-Performance Graphene-Based Multimodal Polymer Nanocomposite at Scale

Advancing the Use of High-Performance Graphene-Based Multimodal Polymer Nanocomposite at Scale

Synthesis of irregular graphene oxide tubes using green chemistry and their potential use as reinforcement materials for biomedical applications

Structure of graphene and its disorders: a review

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