Facile one-step exfoliation of large-size 2D materials via simply shearing in triethanolamine

Chen, Hao; Liu, Bin; Yang, Quanling; Wang, Shan; Liu, Wei; Zheng, Xuan; Liu, Zhikang; Liu, Lei; Xiong, Chuanxi

doi:10.1016/j.matlet.2017.04.066

Cited by 24 publications

(13 citation statements)

References 17 publications

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“…Definitely, we estimate a density of defects as low as (8 ± 2) × 10 9 cm –2 , which is consistent with the high crystalline order of exfoliated graphene flakes (without evidence of defects) imaged by high-resolution TEM (HR-TEM) in Figure S11 of the Supporting Information. For the sake of comparison, from the I (D)/ I (G) analysis in Raman spectra ( Figure 7 and Figure S12 of the Supporting Information), we also estimated the density of defects for graphene exfoliated with NMP, 79 , 122 Cyrene, 79 IPA, 123 DMF, 124 acetone/water, 125 ethanol/water, 126 TEA, 73 and aqueous solution of urea, 74 finding values of (6 ± 2) × 10 10 , (5 ± 2) × 10 10 , (1.0 ± 0.3) × 10 11 , (9 ± 3) × 10 10 , (4 ± 1) × 10 10 , (2.6 ± 0.7) × 10 11 , (6 ± 2) × 10 10 , and (7 ± 2) × 10 10 defects/cm 2 , respectively. Evidently, graphene flakes exfoliated with Polarclean exhibit a density of defects inferior by approximately 1 order of magnitude with respect to LPE assisted by other solvents.…”

Section: Resultsmentioning

confidence: 99%

Sustainable Liquid-Phase Exfoliation of Layered Materials with Nontoxic Polarclean Solvent

Paolucci

D’Olimpio

Lozzi

et al. 2020

ACS Sustainable Chem. Eng.

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Liquid-phase exfoliation is the most suitable platform for large-scale production of two-dimensional materials. One of the main open challenges is related to the quest of green and bioderived solvents to replace state-of-the-art dispersion media, which suffer several toxicity issues. Here, we demonstrate the suitability of methyl-5-(dimethylamino)-2-methyl-5-oxopentanoate (Rhodiasolv Polarclean) for sonication-assisted liquid-phase exfoliation of layered materials for the case-study examples of WS 2 , MoS 2 , and graphene. We performed a direct comparison, in the same processing conditions, with liquid-phase exfoliation using N -methyl-2-pyrrolidone (NMP) solvent. The amount of few-layer flakes (with thickness <5 nm) obtained with Polarclean is increased by ∼350% with respect to the case of liquid-phase exfoliation using NMP, maintaining comparable values of the average lateral size, which even reaches ∼10 μm for the case of graphene produced by exfoliation in Polarclean, and of the yield (∼40%). Correspondingly, the density of defects is reduced by 1 order of magnitude by Polarclean-assisted exfoliation, as evidenced by the I (D)/ I (G) ratio in Raman spectra of graphene as low as 0.07 ± 0.01. Considering the various advantages of Polarclean over state-of-the-art solvents, including the absence of toxicity and its biodegradability, the validation of superior performances of Polarclean in liquid-phase exfoliation paves the way for sustainable large-scale production of nanosheets of layered materials and for extending their use in application fields to date inhibited by toxicity of solvents (e.g., agri-food industry and desalination), with a subsequent superb impact on the commercial potential of their technological applications.

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Section: Resultsmentioning

confidence: 99%

Sustainable Liquid-Phase Exfoliation of Layered Materials with Nontoxic Polarclean Solvent

Paolucci

D’Olimpio

Lozzi

et al. 2020

ACS Sustainable Chem. Eng.

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“…Few‐layer MoS 2 nanosheets were prepared via liquid‐phase exfoliation of their bulk powder in TEOA solution according to our previously reported work . In a typical procedure, accompanied by intermittent ultrasonic agitation, 2 g of MoS 2 powder was dispersed into 200 mL of TEOA with continuous mechanical stirring at a speed of 1000 rpm for 8 h at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Dielectric properties and energy‐storage performance of two‐dimensional molybdenum disulfide nanosheets/polyimide composite films

Cheng

Wang

Liu

et al. 2019

J of Applied Polymer Sci

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Flexible dielectric materials with high electric energy density and high‐temperature resistant characteristic are of great importance for modern electronics and electrical systems. Herein, two‐dimensional molybdenum disulfide (MoS2) nanosheets were efficiently produced via liquid‐phase exfoliation and then incorporated into polyimide (PI) to prepare MoS2/PI dielectric nanocomposites. Compared to the pristine PI, MoS2/PI nanocomposite films exhibited much larger dielectric permittivity while their dielectric losses still maintained relatively low levels. On the other hand, the Weibull breakdown strength of these nanocomposite films initially increased and then decreased with the increase in the MoS2 content and gave rise to a maximum value of 395 MV m−1 at 1 vol % loading. Combination of the improved dielectric permittivity and breakdown strength makes the MoS2/PI nanocomposite film with 1 vol % MoS2 possess an elevated energy density of about 3.35 J cm−3. Moreover, good tensile and thermal properties of the nanocomposite films hold great promise for their applications in high‐temperature and harsh conditions. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47991.

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“…Other green alternatives [triethanolamine ( Chen et al, 2017 )—TEA–and urea aqueous solutions ( He et al, 2015 )] have been tested for the LPE of graphite. In Table 1 , we summarize the features of these green solvents, comparing them to conventional ones.…”

Section: Towards Green Solvents For the Lpe Of Graphitementioning

confidence: 99%

“…In Table 1 , we summarize the features of these green solvents, comparing them to conventional ones. In the single report currently available on the use of TEA, the authors obtained dispersions of crystalline graphene flakes with high stability (over 9 months) ( Chen et al, 2017 ). However, TEA can induce detrimental chemical modifications in the flakes, possibly due to functionalization ( Song et al, 2015 ; Ryu et al, 2017 ; Paolucci et al, 2020 ).…”

Section: Towards Green Solvents For the Lpe Of Graphitementioning

confidence: 99%

Green Solvents for the Liquid Phase Exfoliation Production of Graphene: The Promising Case of Cyrene

et al. 2022

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The liquid phase exfoliation (LPE) of graphite has allowed to produce graphene materials on a large scale and at a reasonable cost. By this method, stable dispersions, inks and liquid suspensions containing atomic-thick graphene flakes with tailored concentrations can be produced, opening up applications in a wide range of cutting-edge technologies such as functional coatings, printed and flexible electronics, and composites. However, currently established LPE techniques raise several health and environmental risks, since unsafe and toxic solvents (such as NMP, DMF, and DMSO) are often regarded as the most effective liquid media for the process. Therefore, it appears necessary to unlock eco-friendly and sustainable methods for the production of graphene at an industrial scale. This review focuses on the latest developments in terms of green solvents for LPE production of graphene. We highlight the use of a new green solvent, Cyrene, and its performance when compared to conventional solvents.

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Facile one-step exfoliation of large-size 2D materials via simply shearing in triethanolamine

Cited by 24 publications

References 17 publications

Sustainable Liquid-Phase Exfoliation of Layered Materials with Nontoxic Polarclean Solvent

Sustainable Liquid-Phase Exfoliation of Layered Materials with Nontoxic Polarclean Solvent

Dielectric properties and energy‐storage performance of two‐dimensional molybdenum disulfide nanosheets/polyimide composite films

Green Solvents for the Liquid Phase Exfoliation Production of Graphene: The Promising Case of Cyrene

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