Efficient Liquid Nitrogen Exfoliation of MoS<sub>2</sub> Ultrathin Nanosheets in the Pure 2H Phase

Wang, Honglei; Lv, Wenzhen; Shi, Jun; Wang, Hongguang; Wang, Dexu; Jin, Lu; Chao, Jie; Aken, Peter A. van; Chen, Runfeng; Huang, Wei

doi:10.1021/acssuschemeng.9b04057

Cited by 34 publications

(24 citation statements)

References 43 publications

(79 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most viable tool for large-scale production of few layers of 2D materials is represented by liquid-phase exfoliation (LPE), ,− which affords high-quality dispersions of 2D materials, exfoliated from their bulk counterparts and dispersed in solvents enabling further processing. ,− Definitely, a suitable solvent for LPE should minimize the energy input required to overcome the van der Waals forces for effective sheet separation. − , This corresponds to the minimization of the enthalpy of mixing per unit volume Δ H / V , which, in turn, is connected to the Helmholtz free energy of solvent ( F solv ) and the Helmholtz free energy of layered materials ( F layered ), the thickness of the flakes ( T layered ), and the volume fraction (φ): , with where σ s is the surface energy and S sur the surface entropy.…”

Section: Introductionmentioning

confidence: 99%

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

Paolucci

D’Olimpio

Lozzi

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Paolucci

D’Olimpio

Lozzi

et al. 2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…Obvious shifts of the peak positions of the two characteristic E1 2g (in-plane bending) and A 1g (stretching of sulfur bonds) vibrations at around 377.8 and 402.3 cm −1 in comparison with those of pristine bulk MoS 2 clearly suggest the well exfoliation of the bulk powders to the few-layered nanosheets. [25] Also, from X-ray diffraction (XRD) patterns (Figure 3e), bulk MoS 2 shows many strong sharp peaks in the range from 10° to 90°, which match well with the hexagonal 2H-MoS 2 (JCPDS: 65--1951). The (002) reflection at 14.46° in bulk MoS 2 broadens and shifts to 13.57° in MC10, indicating that the intercalation of CNC leads to an expansion of the interlayer spacing in the sandwiched MoS 2 nanocomposites.…”

Section: Resultsmentioning

confidence: 53%

Facile Preparation of MoS₂ Nanocomposites for Efficient Potassium‐Ion Batteries by Grinding‐Promoted Intercalation Exfoliation

Wang

Niu

Shi

et al. 2021

Small

Self Cite

View full text Add to dashboard Cite

However, the large ionic radius of K + (2.76 Å) is unfavorable for its insertion into anode materials, resulting in a relatively low specific capacity and poor rate performance. [2] To meet the requirements of the energy storage technologies for rechargeable KIBs, the development of high-performance materials with high capacity and favorable reliability has become increasingly urgent. [3] 2D-layered transition metal dichalcogenides (TMDs) with a formula of MX 2 (M = Mo, W, V, Ta, and Ti; X = S, Se, and Te) have attracted significant interest because of their highly accessible surface area, fast charge-transfer kinetics, and the undercoordinated edge sites of layered TMDs, which can act as extra adsorption sites for metal ions. [4] Especially, 2D TMDs with expanded interlayer spacing will be highly desired to accommodate the largesized potassium ions (K + ) for the fast K + diffusion in high-performance KIBs. [5] As a typical 2D TMD, molybdenum disulfide (MoS 2 ) with distinctive semiconductor properties has gained special attention. [6] 2D MoS 2 shows a direct bandgap in multiple phases: a semiconducting 2D hexagonal phase (2H phase) with a trigonal prismatic crystal structure (2H-MoS 2 ), a metallic 1T phase with a triclinic crystal structure (1T-MoS 2 ) and edge-sharing octahedra, and a distorted triclinic phase (1T′-MoS 2 ), [7] offering broad application potentials in diversified optical and electronic devices. [8] Indeed, Efficient exfoliations of bulk molybdenum disulfide (MoS 2 ) into few-layered nanosheets in pure phase are highly attractive because of the promising applications of the resulted 2D materials in diversified optoelectronic devices. Here, a new exfoliation method is presented to prepare semiconductive 2D hexagonal phase (2H phase) MoS 2 -cellulose nanocrystal (CNC) nanocomposites using grinding-promoted intercalation exfoliation (GPIE). This method with facile grinding of the bulk MoS 2 and CNC powder followed by conventional liquid-phase exfoliation in water can not only efficiently exfoliate 2H-MoS 2 nanosheets, but also produce the 2H-MoS 2 /CNC 2D nanocomposites simultaneously. Interestingly, the intercalated CNC sandwiched in MoS 2 nanosheets increases the interlayer spacing of 2H-MoS 2 , providing perfect conditions to accommodate the large-sized ions. Therefore, these nanocomposites are good anode materials of potassium-ion batteries (KIBs), showing a high reversible capacity of 203 mAh g −1 at 200 mA g −1 after 300 cycles, a good reversible capacity of 114 mAh g −1 at 500 mA g −1 , and a low decay of 0.02% per cycle over 1500 cycles. With these impressive KIB performances, this efficient GPIE method will open up a new avenue to prepare pure-phase MoS 2 and promising 2D nanocomposites for highperformance device applications.

show abstract

“…For instance, the monolayered MoS 2 nanosheet (Figure A) and MoS 2 – g -C 3 N 4 nanocomposites were synthesized by facile ultrasonication method. Nevertheless, mechanical exfoliation method is not suitable for large-scale productions of MoS 2 , because of its low yield (<5 wt %) and uncontrollable size and layer number (multilayered MoS 2 ). , The stable MoS 2 nanosheets can be synthesized in the large scale under sonication conditions by adding various organic (e.g., methylpyrrolidinone or N -vinyl-pyrrolidinone), − which prevented the aggregation of exfoliated MoS 2 flakes.…”

Section: Synthesis and Properties Of Mos2mentioning

confidence: 99%

Recent Advances in Two-Dimensional MoS₂ Nanosheets for Environmental Application

Ishag

2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Molybdenum disulfide (MoS2), as one of the most common two-dimensional (2D) metal sulfides, has been attracting much attention in the area of energy storage and environmental remediation, because of its fascinating properties. Although much research regarding the environmental application of MoS2 have been recently summarized, reports on the recent progress of the removal of various environmental pollutants on MoS2 are still scarce. Herein, we systematically summarize the efficient elimination of environmental contaminants (e.g., gas, organic, heavy metals, and radionuclides) on MoS2-based nanosheets. In addition, the interaction mechanisms (e.g., physical (hydrogen bonding, van der Waals forces), ion-exchange, chemical adsorption, and redox) of environmental contaminants on MoS2-based materials were elucidated in detail. Finally, the major challenges and future prospective on MoS2-based materials were presented. This review has important implication for the design of MoS2-based materials with high adsorption performance and strong redox capacity toward the removal of various environmental pollutants in actual application.

show abstract

Efficient Liquid Nitrogen Exfoliation of MoS₂ Ultrathin Nanosheets in the Pure 2H Phase

Cited by 34 publications

References 43 publications

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

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

Facile Preparation of MoS₂ Nanocomposites for Efficient Potassium‐Ion Batteries by Grinding‐Promoted Intercalation Exfoliation

Recent Advances in Two-Dimensional MoS₂ Nanosheets for Environmental Application

Contact Info

Product

Resources

About

Efficient Liquid Nitrogen Exfoliation of MoS2 Ultrathin Nanosheets in the Pure 2H Phase

Cited by 34 publications

References 43 publications

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

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

Facile Preparation of MoS2 Nanocomposites for Efficient Potassium‐Ion Batteries by Grinding‐Promoted Intercalation Exfoliation

Recent Advances in Two-Dimensional MoS2 Nanosheets for Environmental Application

Contact Info

Product

Resources

About

Efficient Liquid Nitrogen Exfoliation of MoS₂ Ultrathin Nanosheets in the Pure 2H Phase

Facile Preparation of MoS₂ Nanocomposites for Efficient Potassium‐Ion Batteries by Grinding‐Promoted Intercalation Exfoliation

Recent Advances in Two-Dimensional MoS₂ Nanosheets for Environmental Application