Hexagonal Transition‐Metal Chalcogenide Nanoflakes with Pronounced Lateral Quantum Confinement

Miró, Pere; Han, Jae Hyo; Cheon, Jinwoo; Heine, Thomas

doi:10.1002/anie.201404704

Cited by 20 publications

(14 citation statements)

References 34 publications

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“…Wet chemical approaches can be used to synthesize 2D materials with thicknesses ranging from the monolayer to hundreds of layers 28, 29 and have several advantages. Reaction temperatures are much lower than in vapor-phase routes, and the products can exhibit exceptional uniformity and low defect density.…”

Section: Fabrication Methods Processing and Exposure Potentialmentioning

confidence: 99%

Biological and environmental interactions of emerging two-dimensional nanomaterials

Wang¹,

Zhu²,

Qiu³

et al. 2016

Chem. Soc. Rev.

239

210

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Two-dimensional materials have become a major focus in materials chemistry research worldwide with substantial efforts centered on synthesis, property characterization, and technological application. These high-aspect ratio sheet-like solids come in a wide array of chemical compositions, crystal phases, and physical forms, and are anticipated to enable a host of future technologies in areas that include electronics, sensors, coatings, barriers, energy storage and conversion, and biomedicine. A parallel effort has begun to understand the biological and environmental interactions of synthetic nanosheets, both to enable the biomedical developments and to ensure human health and safety for all application fields. This review covers the most recent literature on the biological responses to 2D materials and also draws from older literature on natural lamellar minerals to provide additional insight into the essential chemical behaviors. The article proposes a framework for more systematic investigation of biological behavior in the future, rooted in fundamental materials chemistry and physics. That framework considers three fundamental interaction modes: (i) chemical interactions and phase transformations, (ii) electronic and surface redox interactions, and (iii) physical and mechanical interactions that are unique to near-atomically-thin, high-aspect-ratio solids. Two-dimensional materials are shown to exhibit a wide range of behaviors, which reflect the diversity in their chemical compositions, and many are expected to undergo reactive dissolution processes that will be key to understanding their behaviors and interpreting biological response data. The review concludes with a series of recommendations for high-priority research subtopics at the “bio-nanosheet” interface that we hope will enable safe and successful development of technologies related to two-dimensional nanomaterials.

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Section: Fabrication Methods Processing and Exposure Potentialmentioning

confidence: 99%

Biological and environmental interactions of emerging two-dimensional nanomaterials

Wang¹,

Zhu²,

Qiu³

et al. 2016

Chem. Soc. Rev.

239

210

View full text Add to dashboard Cite

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“…LUMO 37,38 . Similarly, LUMO of group IV TMCs (for example, TiS 2 , ZrS 2 , ZrSe 2 , HfS 2 and HfSe 2 ) is ranging from À 6.0 to À 5.5 eV, which is close to HOMO (approximately À 6.2 eV) of relatively weaker base alkylamines [37][38][39] .…”

Section: Article Nature Communications | Doi: 101038/ncomms6763mentioning

confidence: 99%

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

et al. 2015

Self Cite

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Simple and effective generation of transition metal chalcogenides (TMCs) in a single-layer form has been a challenging task. Here we present a tandem molecular intercalation (TMI) as a new exfoliation concept for producing single-layer TMCs from multi-layer colloidal TMC nanostructures in solution phase. TMI requires tandem Lewis base intercalates, where short 'initiator' molecules first intercalate into TMCs to open up the interlayer gap, and the long 'primary' molecules then bring the gap to full width so that a random mixture of intercalates overcomes the interlayer force. Spontaneous exfoliation then yields single-layer TMCs. The TMI process is uniquely advantageous because it works in a simple one-step process under safe and mild conditions (that is, room temperature without sonication or H 2 generation). With the appropriate intercalates, we have successfully generated single-layer nanostructures of group IV (TiS 2 , ZrS 2 ), group V (NbS 2 ) and VI (WSe 2 , MoS 2 ) TMCs.

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“…Each layer is three atoms thick with the metal in the centre and the chalcogen atoms above and below the metal [6]. Nanoflakes of these materials are promising due to the properties emerging from their inter-layer or intra-layer bonding [7]. Property variations emerge by changing the number of layers or the lateral size within a layer.…”

Section: Introductionmentioning

confidence: 99%

A study of size-dependent properties of MoS2 monolayer nanoflakes using density-functional theory

Javaid

Drumm

Russo

et al. 2017

Sci Rep

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Novel physical phenomena emerge in ultra-small sized nanomaterials. We study the limiting small-size-dependent properties of MoS2 monolayer rhombic nanoflakes using density-functional theory on structures of size up to Mo35S70 (1.74 nm). We investigate the structural and electronic properties as functions of the lateral size of the nanoflakes, finding zigzag is the most stable edge configuration, and that increasing size is accompanied by greater stability. We also investigate passivation of the structures to explore realistic settings, finding increased HOMO-LUMO gaps and energetic stability. Understanding the size-dependent properties will inform efforts to engineer electronic structures at the nano-scale.

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Hexagonal Transition‐Metal Chalcogenide Nanoflakes with Pronounced Lateral Quantum Confinement

Cited by 20 publications

References 34 publications

Biological and environmental interactions of emerging two-dimensional nanomaterials

Biological and environmental interactions of emerging two-dimensional nanomaterials

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

A study of size-dependent properties of MoS2 monolayer nanoflakes using density-functional theory

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