Tandem intercalation strategy for single-layer nanosheets as an effective alternative to conventional exfoliation processes

Jeong, Sohee; Yoo, Dongwon; Ahn, Minji; Miró, Pere; Heine, Thomas; Cheon, Jinwoo

doi:10.1038/ncomms6763

Cited by 152 publications

(132 citation statements)

References 45 publications

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“…High-angle annular dark field (HAADF) imaging in an aberration-corrected STEM has revealed a high concentration of the zigzag-like superlattices identified as strained metallic 1T phase in the exfoliated WS 2 nanosheets. [38] and (e-k) adapted with permission from Jeong et al [39].…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…Secondly, the expanded MoS 2 flakes are intercalated by alkali naphthalenide followed by exfoliation in ultrasonicated water operated at low power to avoid fragmentation of the sheets. Figure 3a- [39] reported a tandem molecular intercalation (TMI) strategy (figure 3e) where a short initiator alkylamine intercalate expands the interlayer gap of TMDCs for an efficient intercalation of another long primary alkylamine. Owing to the difference in chain length, a bilayer arrangement with empty spaces between intercalates is adopted to reduce van der Waals force between them and spontaneous exfoliation occurs finally to yield single-layer TMDCs.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Jana¹,

Rao²

2016

Phil. Trans. R. Soc. A.

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The discovery of graphene marks a major event in the physics and chemistry of materials. The amazing properties of this two-dimensional (2D) material have prompted research on other 2D layered materials, of which layered transition metal dichalcogenides (TMDCs) are important members. Single-layer and few-layer TMDCs have been synthesized and characterized. They possess a wide range of properties many of which have not been known hitherto. A typical example of such materials is MoS 2 . In this article, we briefly present various aspects of layered analogues of graphene as exemplified by TMDCs. The discussion includes not only synthesis and characterization, but also various properties and phenomena exhibited by the TMDCs.This article is part of the themed issue 'Fullerenes: past, present and future, celebrating the 30th anniversary of Buckminster Fullerene'.

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Section: Synthesis and Characterizationmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Jana¹,

Rao²

2016

Phil. Trans. R. Soc. A.

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“…Thus it is possible to obtain few layers or even monolayer from their bulk counterparts. [1][2][3] Among various kinds of the layered materials, transition metal dichalcogenides (TMDs) stand out because some of them exhibit even much more exciting properties compared to the star material graphene. For instance, MoS 2 monolayer was found a semiconductor with sizeable direct band gap of about 1.8-1.9 eV, 4-6 overcoming the disadvantage of zero band gap in graphene when applied in the field effect transistors (FETs) and optoelectronic devices.…”

Section: Introductionmentioning

confidence: 99%

Strain-controlled switch between ferromagnetism and antiferromagnetism in1T−CrX2(X=Se, Te) monolayers

Shao

et al. 2015

Phys. Rev. B

147

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We report on the strain-induced switch between ferromagnetic (FM) and antiferromagnetic (AFM) orderings in 1T -CrX2 (X = Se, Te) monolayers based on the first-principles calculations. The CrSe2 and CrTe2 monolayers without strains are found to be AFM and FM, respectively. Under the biaxial tensile strain, the CrSe2 monolayer tends to be FM when the strain is larger than 2%. The FM state is further stabilized when the strain is increased. Moreover, the CrSe2 monolayer changes to be halfmetallic when the tensile strain is larger than 10%. While for the CrTe2 monolayer, the critical strain at which the transition between the FM and AFM states occurs is compressive, of −1%. Relatively small tensile strains of 4% and 2%, respectively, can enhance the Curie temperature of CrSe2 and CrTe2 monolayers above the room temperature. The strain-induced switch between the FM and AFM states in CrSe2 (CrTe2) monolayer can be understood by the competition between the AFM Cr-Cr direct exchange interaction and FM Cr-Se(Te)-Cr superexchange interaction. The tunable and attractive magnetic and electronic properties controlled by the flexible strain are desirable for the future nanoelectronic applications.

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“…There are few studies on thin-layers of ZrX2 and they are obtained by chemical 59 exfoliation (nanosheets and nanodiscs) [18,19], grown by chemical vapor deposition (nanobelts and 60 flakes) [20][21][22] or by epitaxy [23].…”

mentioning

confidence: 99%

Raman Spectra of ZrS2 and ZrSe2 from Bulk to Atomically Thin Layers

et al. 2016

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Abstract:In the race towards two-dimensional electronic and optoelectronic devices, semiconducting transition metal dichalcogenides (TMDCs) from group VIB have been intensively studied in recent years due to the indirect to direct band-gap transition from bulk to the monolayer. However, new materials still need to be explored. For example, semiconducting TMDCs from group IVB have been predicted to have larger mobilities than their counterparts from group VIB in the monolayer limit. In this work we report the mechanical exfoliation of ZrX 2 (X = S, Se) from bulk down to the monolayer and we study the dimensionality dependence of the Raman spectra in ambient conditions. We observe Raman signal from bulk to few layers and no shift in the peak positions is found when decreasing the dimensionality. While a Raman signal can be observed from bulk to a bilayer for ZrS 2 , we could only detect signal down to five layers for flakes of ZrSe 2 . These results show the possibility of obtaining atomically thin layers of ZrX 2 by mechanical exfoliation and represent one of the first steps towards the investigation of the properties of these materials, still unexplored in the two-dimensional limit.

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Tandem intercalation strategy for single-layer nanosheets as an effective alternative to conventional exfoliation processes

Cited by 152 publications

References 45 publications

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Two-dimensional inorganic analogues of graphene: transition metal dichalcogenides

Strain-controlled switch between ferromagnetism and antiferromagnetism in1T−CrX2(X=Se, Te) monolayers

Raman Spectra of ZrS2 and ZrSe2 from Bulk to Atomically Thin Layers

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