Colloidal graphene—Scalable processing for advanced materials

Texter, John

doi:10.1016/j.cocis.2015.11.009

Cited by 6 publications

(4 citation statements)

References 125 publications

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“…Graphene, [1] the prototype of novel 2D materials, has become a highly promising icandidate for future carbon-based devices. [2] Nowadays, the most important chemical routes towards its production are the liquid-phase exfoliation of graphite, [3][4] the reduction of graphene oxide, [5][6] and its bottom-up synthesis, starting from small precursor molecules. [7] Besides its production, also its functionalization has attracted a lot of interest in the scientific community due to its unprecedented physical properties and the wide range of possible applications where this carbon nano-material and its derivatives can be implemented.…”

Section: Introductionmentioning

confidence: 99%

Perylene-based non-covalent functionalization of 2D materials

2017

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The surfactant assisted exfoliation and non-covalent functionalization of twodimensional layered materials, like graphene, transition metal dichalcogenides, etc., has extraordinarily been propelled forward within the last 5 years. Numerous molecules have been designed and attached to the exfoliated layers, and based on their outstanding properties, perylene based dyes have become one of the most frequently used π-detergents. Therefore, the prospect of this micro review is to summarize the most prominent achievements in this rapidly progressing field of research. IntroductionGraphene, [1] the prototype of novel 2D materials, has become a highly promising icandidate for future carbon-based devices. [2] Nowadays, the most important chemical routes towards its production are the liquid-phase exfoliation of graphite, [3][4] the reduction of graphene oxide, [5][6] and its bottom-up synthesis, starting from small precursor molecules. [7] Besides its production, also its functionalization has attracted a lot of interest in the scientific community due to its unprecedented physical properties and the wide range of possible applications where this carbon nano-material and its derivatives can be implemented. With this objective, the covalent functionalization of graphene has been investigated in detail [8] and also the non-covalent modification of graphene and other 2D materials has extraordinarily been propelled forward within the last 5 years.

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Section: Introductionmentioning

confidence: 99%

Perylene-based non-covalent functionalization of 2D materials

2017

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“…The low yield (mass of graphene product/mass of graphite feedstock) of few layered nanosheets obtained after centrifugation is particularly problematic. Typical yields reported in the literature for well dispersed pristine graphene nanosheets are <2% [21]. Usually, low yields are attributed to difficulties in exfoliation, so numerous attempts to improve exfoliation have been reported recently; one notable study showed that despite low yields, exfoliation is scalable in industrial shear mixing [22].…”

Section: Introductionmentioning

confidence: 99%

“…Typical yields reported in the literature for well dispersed pristine graphene nanosheets are < 2%. 21 Usually, low yields are attributed to difficulties in exfoliation, so numerous attempts to improve exfoliation have been reported recently; one notable study showed that despite low yields, exfoliation is scalable in industrial shear mixing. 22 However, we argue that not only difficulties in exfoliation but also difficulties in separation are responsible for the low yield.…”

Section: Introductionmentioning

confidence: 99%

Graphene reflux: improving the yield of liquid-exfoliated nanosheets through repeated separation techniques

et al. 2016

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Scalable production of graphene through liquid-phase exfoliation has been plagued by low yields. Although several recent studies have attempted to improve graphene exfoliation technology, the problem of separating colloidal nanosheets from unexfoliated parent material has received far less attention. Here we demonstrate a scalable method for improving nanosheet yield through a facile washing process. By probing the sedimentation of liquid-phase exfoliated slurries of graphene nanosheets and parent material, we found that a portion of exfoliated graphene is entrapped in the sediment, but can be recovered by repeatedly washing the slurry of nanosheet and parent material with additional solvent. We found this process to significantly increase the overall yield of graphene (graphene / parent material) and recover a roughly constant proportion of graphene with each wash. The cumulative amount of graphene recovered is only a function of total solvent volume. Moreover, we found this technique to be applicable to other types of nanosheets such as boron nitride nanosheets.

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“…Introduction: Graphene had attracted copious attention owing to its unique combination of electrical [1], mechanical [2] and thermal conductivity [3]. Considerable researches had carried out on the study of preparing few-layer graphene [4,5]. Liquid phase exfoliation (LPE) has become more and more popular due to the simplicity, versatility and scalability of the process compared to techniques such as mechanical exfoliation using scotch tape, chemical vapour deposition (CVD), epitaxial growth and chemical oxidation [6][7][8].…”

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confidence: 99%

High concentration of few‐layer graphene and MoS ₂ nanosheets using carboxyl methyl cellulose as a high‐performance stabiliser

Shang

Ding

Xue

et al. 2019

Micro & Nano Letters

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This work report a facile, rapid and efficient approach to prepare high-concentration graphene and MoS 2 nanosheets through the liquid phase exfoliation of bulk materials with the method of high-pressure homogenisation assisted by carboxyl methyl cellulose. The few-layer graphene and MoS 2 nanosheets dispersions are prepared under 100 MPa for 10 min at high concentrations up to 1.45 and 0.28 mg/ml. The two nanodispersions could be applied to prepare the polyvinyl alcohol composite with well dispersibility and thermal stability.

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Colloidal graphene—Scalable processing for advanced materials

Cited by 6 publications

References 125 publications

Perylene-based non-covalent functionalization of 2D materials

Perylene-based non-covalent functionalization of 2D materials

Graphene reflux: improving the yield of liquid-exfoliated nanosheets through repeated separation techniques

High concentration of few‐layer graphene and MoS ₂ nanosheets using carboxyl methyl cellulose as a high‐performance stabiliser

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Colloidal graphene—Scalable processing for advanced materials

Cited by 6 publications

References 125 publications

Perylene-based non-covalent functionalization of 2D materials

Perylene-based non-covalent functionalization of 2D materials

Graphene reflux: improving the yield of liquid-exfoliated nanosheets through repeated separation techniques

High concentration of few‐layer graphene and MoS 2 nanosheets using carboxyl methyl cellulose as a high‐performance stabiliser

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High concentration of few‐layer graphene and MoS ₂ nanosheets using carboxyl methyl cellulose as a high‐performance stabiliser