Exfoliation and dispersion of graphene in ethanol-water mixtures

Liu, Weiwei; Khosa, Azhar Abbas; Wang, Xiaoxia; Wang, Jiannong

doi:10.1007/s11706-012-0166-4

Cited by 65 publications

(35 citation statements)

References 38 publications

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“…Firstly, MoS 2 nanosheets were exfoliated using a mixture of ethanol/water and forming a stable dispersion of mono and few‐layer MoS 2 . Since it was reported earlier that the ratio of ethanol and water in mixture‐form found crucial to both the exfoliation and dispersion processes of graphite to graphene . Secondly, the MoS 2 QDs were prepared by refluxing the obtained suspension of exfoliated MoS 2 NSs in DMF at atmospheric pressure for 24 hours.…”

Section: Resultsmentioning

confidence: 99%

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Khan

2019

ChemistrySelect

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In this work, a facile chemical route is presented to prepare photoluminescent MoS2 quantum dots (QDs) and nanosheets (NSs) on a large‐scale. The strategy involves probe‐type sonication of bulk MoS2 sheets in ethanol/water mixture followed by refluxing in dimethylformamide (DMF) solution. This preparation route makes cleavage of the Van‐der‐Waal layers possible by exfoliation across the 2D planes and the complete breakup of bulk MoS2 sheets around the defects and edges. The as‐prepared MoS2 QDs and NSs exhibit size quantization effects in their optical absorption and emission spectra. The resultant MoS2 NSs consist of few layers with lateral size around ∼80 nm and exhibit excitation dependent blue emission. Whereas, most of the MoS2 QDs were measured around ∼4.8 nm in lateral size and showed distinct green emission upon excitation. This may be attributed to a combined contribution from the increase in the quantum‐sized core, edge defects, dangling bonds, and surface states recombination. The study thus provides a simple pathway for the preparation of monolayer QDs and few‐layer NSs of transition‐metal‐dichalcogenides (TMD) or other layered materials.

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Section: Resultsmentioning

confidence: 99%

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Khan

2019

ChemistrySelect

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“…[29] The functionalization of GO into aP d-containingn anocomposite in the presence of asurfactant could additionally offer aselective catalytic system, which could work efficiently under aqueous conditions. The novel nanocomposite wasp repared by exfoliation of graphite oxide (by dilution and sonication) to generate dispersed GO sheets in aqueous media, after which Pd NPs -GO could be obtained upon incorporation of Pd through coordination ontot he surfaceo fG Oa nd final reduction by using NaBH 4 (Scheme 1).…”

Section: Resultsmentioning

confidence: 99%

“…[28] One of the major concerns in the area of graphene-based materials relates to the stabilization of the exfoliated sheets of graphene and GO. [29][30][31][32] The use of surfactants has been regarded as ah ighly appropriate, simple, andg reener methodology for the exfoliation of GO compared with other proposed methodologies. [32][33][34][35] For example, the use of P123, at riblockc opolymer,w as reported to lead to ar emarkable exfoliation, favoring GO dispersion.…”

Section: Introductionmentioning

confidence: 99%

Surfactant‐Exfoliated Highly Dispersive Pd‐Supported Graphene Oxide Nanocomposite as a Catalyst for Aerobic Aqueous Oxidations of Alcohols

et al. 2015

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A pluronic P123 surfactant was employed in the exfoliation and stabilization of Pd0‐supported graphene oxide (PdNPs–GO; NPs=nanoparticles) nanosheets in aqueous solution during the oxidation of benzylic and aliphatic alcohols under aerobic conditions at 80 °C. Surfactants prevented the aggregation of PdNPs–GO sheets at 80 °C under aqueous conditions and PdNPs–GO/P123 adducts acted as a highly dispersive homogeneous‐like catalyst. The catalytic performance of the nanocomposite material was remarkably improved, being highly stable and reusable in the aerobic oxidation of alcohols for at least nine runs.

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“…According to [11], graphene was observed in the aqueous solution containing 70 vol. % ethanol with maximum concentration of 0.05 mg/mL.…”

Section: B Dispersion and Dyeing Processmentioning

confidence: 99%

“…It has attracted significant attention as a result of its outstanding electronic, mechanical and chemical properties [11]. Meanwhile, ZnO is an important metal oxide nanostructure which has unique advantages in electronic devices, low processing cost, durability and strong energy [12].…”

Section: Introductionmentioning

confidence: 99%

Investigation of embroidery conductive layer dyed with graphene and ZnO

Bao

Ooi

Chin

et al. 2014

2014 International Symposium on Antennas and Propagation Conference Proceedings

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This paper presents a method to improve the conductivity of embroidered patch antenna by using graphene and zinc oxide (ZnO) nanopowder. By dispersion and immersion of graphene and ZnO, the embroidered conductive patch layers have been designed, fabricated and tested. Analysis of the effect of graphene and ZnO solution on patch resistance has been carried out. The measured results show that the conductivity performs better with ZnO dyed embroidered patch layer. In contrast, graphene improves the sheet resistance while ethanol solvent reacts with silver thread.

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Exfoliation and dispersion of graphene in ethanol-water mixtures

Cited by 65 publications

References 38 publications

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Surfactant‐Exfoliated Highly Dispersive Pd‐Supported Graphene Oxide Nanocomposite as a Catalyst for Aerobic Aqueous Oxidations of Alcohols

Investigation of embroidery conductive layer dyed with graphene and ZnO

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Exfoliation and dispersion of graphene in ethanol-water mixtures

Cited by 65 publications

References 38 publications

Size‐Dependent Quantization Effect in Optical Properties of MoS2 Nanostructures

Size‐Dependent Quantization Effect in Optical Properties of MoS2 Nanostructures

Surfactant‐Exfoliated Highly Dispersive Pd‐Supported Graphene Oxide Nanocomposite as a Catalyst for Aerobic Aqueous Oxidations of Alcohols

Investigation of embroidery conductive layer dyed with graphene and ZnO

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Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures

Size‐Dependent Quantization Effect in Optical Properties of MoS₂ Nanostructures