Chemical Unzipping of WS<sub>2</sub> Nanotubes

Nethravathi, C.; Jeffery, A. Anto; Rajamathi, Michael; Kawamoto, Naoyuki; Tenne, Reshef; Golberg, Dmitri; Bando, Yoshio

doi:10.1021/nn4029635

Cited by 55 publications

(54 citation statements)

References 37 publications

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“…The XPS peak of C 1s at 284.8 eV is assigned to residual carbon from the XPS instrument. Observed from the high-resolution XPS spectrum of W, two distinct peaks, located at binding energies of 35.506 eV for W 4f5/2 and 33.101eV for W 4f7/2, are very consistent with the characteristic of W 4+ in WS 2 (Fig.S3) [20]. The XPS spectrum of S2p exhibits a doublet at 162.33 and 163.54 eV, which is the feature of S 2in WS 2 (Fig.S4).…”

Section: Results and Discussion Characterizationsupporting

confidence: 53%

Space-confined growth of Ag₃PO₄nanoparticles within WS₂sheets: Ag₃PO₄/WS₂composites as visible-light-driven photocatalysts for decomposing dyes

Liu

et al. 2015

J. Mater. Chem. A

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A highly efficient Ag 3 PO 4 /WS 2 composite photocatalyst was synthesized by controlling the growth of Ag 3 PO 4 nanoparticles within WS 2 sheets. The process can tune the microstructure, stability and visible-light photocatalytic performance of Ag 3 PO 4 . The WS 2 sheets, possessing uncoordinated sulfur atoms on exposed surfaces and edges, play an important role in the formation of Ag 3 PO 4 /WS 2 composite. With 0.05mol of AgAc added, the Ag 3 PO 4 /WS 2 composite shows the highest photocatalytic activity. The matched energy level between Ag 3 PO 4 and WS 2 inhibits the recombination of the photogenerated electrons and holes. The enhanced photocatalytic activity is also attributed to the multi-interface heterojunction structure assembled by two-dimensional sheets and nanoparticles, driven by the chemical binding. The addition of WS 2 sheets can also reduce the rate at which Ag + dissolves from Ag 3 PO 4 into the water, improving the stability of Ag 3 PO 4 . This work could provide new insights into fabricating highly efficient and stable Ag 3 PO 4 -transition-metal dichalcogenide composite photocatalysts for dye degradation.

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Section: Results and Discussion Characterizationsupporting

confidence: 53%

Space-confined growth of Ag₃PO₄nanoparticles within WS₂sheets: Ag₃PO₄/WS₂composites as visible-light-driven photocatalysts for decomposing dyes

Liu

et al. 2015

J. Mater. Chem. A

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“…This insight would point in a direction of dynamic phase switching and large-area synthesis of the elusive metallic phase using standard chemical growth techniques, such as chemical vapour deposition. Chemical growth techniques are an area of rapid progress in recent years [27][28][29][30][31][32] . One would furthermore like to know what TMD compounds are nearest to the phase boundaries at ambient conditions, and therefore most amenable to applications involving transformations between phases or mixed-phase regimes.…”

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confidence: 99%

Structural phase transitions in two-dimensional Mo- and W-dichalcogenide monolayers

2014

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Mo-and W-dichalcogenide compounds have a two-dimensional monolayer form that differs from graphene in an important respect: it can potentially have more than one crystal structure. Some of these monolayers exhibit tantalizing hints of a poorly understood structural metal-to-insulator transition with the possibility of long metastable lifetimes. If controllable, such a transition could bring an exciting new application space to monolayer materials beyond graphene. Here we discover that mechanical deformations provide a route to switching thermodynamic stability between a semiconducting and a metallic crystal structure in these monolayer materials. Based on state-of-the-art density functional and hybrid Hartree-Fock/density functional calculations including vibrational energy corrections, we discover that MoTe 2 is an excellent candidate phase change material. We identify a range from 0.3 to 3% for the tensile strains required to transform MoTe 2 under uniaxial conditions at room temperature. The potential for mechanical phase transitions is predicted for all six studied compounds.

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“…In another study, Nethravathi et al synthesized WS 2 NRs by chemically unzipping WS 2 nanotubes using Li atoms. 56 WS 2 nanotubes were intercalated by Li atoms and the nanotubes reacted with various solvents and broke into NR pieces. The synthesized NRs are about 10-12 layers and have a width of about 100 nm which is wider than that synthesized by Wang et al…”

Section: B Nrs Of Wsmentioning

confidence: 99%

Nanoribbons: From fundamentals to state-of-the-art applications

Yagmurcukardes

Peeters

Senger

et al. 2016

Applied Physics Reviews

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Atomically thin nanoribbons (NRs) have been at the forefront of materials science and nanoelectronics in recent years. State-of-the-art research on nanoscale materials has revealed that electronic, magnetic, phononic, and optical properties may differ dramatically when their one-dimensional forms are synthesized. The present article aims to review the recent advances in synthesis techniques and theoretical studies on NRs. The structure of the review is organized as follows: After a brief introduction to low dimensional materials, we review different experimental techniques for the synthesis of graphene nanoribbons (GNRs) with their advantages and disadvantages. In addition, theoretical investigations on width and edge-shape-dependent electronic and magnetic properties, functionalization effects, and quantum transport properties of GNRs are reviewed. We then devote time to the NRs of the transition metal dichalcogenides (TMDs) family. First, various synthesis techniques, E-field-tunable electronic and magnetic properties, and edge-dependent thermoelectric performance of NRs of MoS 2 and WS 2 are discussed. Then, strongly anisotropic properties, growth-dependent morphology, and the weakly width-dependent bandgap of ReS 2 NRs are summarized. Next we discuss TMDs having a T-phase morphology such as TiSe 2 and stable single layer NRs of mono-chalcogenides. Strong edge-type dependence on characteristics of GaS NRs, width-dependent Seebeck coefficient of SnSe NRs, and experimental analysis on the stability of ZnSe NRs are reviewed. We then focus on the most recently emerging NRs belonging to the class of transition metal trichalcogenides which provide ultra-high electron mobility and highly anisotropic quasi-1D properties. In addition, width-, edge-shape-, and functionalization-dependent electronic and mechanical properties of blackphosphorus, a monoatomic anisotropic material, and studies on NRs of group IV elements (silicene, germanene, and stanene) are reviewed. Observation of substrate-independent quantum well states, edge and width dependent properties, the topological phase of silicene NRs are reviewed. In addition, H 2 concentration-dependent transport properties and anisotropic dielectric function of GeNRs and electric field and strain sensitive I-V characteristics of SnNRs are reviewed. We review both experimental and theoretical studies on the NRs of group III-V compounds. While defect and N-termination dependent conductance are highlighted for boron nitride NRs, aluminum nitride NRs are of importance due to their dangling bond, electric field, and strain dependent electronic and magnetic properties. Finally, superlattice structure of NRs of GaN/AlN, Si/Ge, G/BN, and MoS 2 /WS 2 is reviewed. Published by AIP Publishing.

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Chemical Unzipping of WS₂ Nanotubes

Cited by 55 publications

References 37 publications

Space-confined growth of Ag₃PO₄nanoparticles within WS₂sheets: Ag₃PO₄/WS₂composites as visible-light-driven photocatalysts for decomposing dyes

Space-confined growth of Ag₃PO₄nanoparticles within WS₂sheets: Ag₃PO₄/WS₂composites as visible-light-driven photocatalysts for decomposing dyes

Structural phase transitions in two-dimensional Mo- and W-dichalcogenide monolayers

Nanoribbons: From fundamentals to state-of-the-art applications

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Chemical Unzipping of WS2 Nanotubes

Cited by 55 publications

References 37 publications

Space-confined growth of Ag3PO4nanoparticles within WS2sheets: Ag3PO4/WS2composites as visible-light-driven photocatalysts for decomposing dyes

Space-confined growth of Ag3PO4nanoparticles within WS2sheets: Ag3PO4/WS2composites as visible-light-driven photocatalysts for decomposing dyes

Structural phase transitions in two-dimensional Mo- and W-dichalcogenide monolayers

Nanoribbons: From fundamentals to state-of-the-art applications

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Product

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Chemical Unzipping of WS₂ Nanotubes

Space-confined growth of Ag₃PO₄nanoparticles within WS₂sheets: Ag₃PO₄/WS₂composites as visible-light-driven photocatalysts for decomposing dyes

Space-confined growth of Ag₃PO₄nanoparticles within WS₂sheets: Ag₃PO₄/WS₂composites as visible-light-driven photocatalysts for decomposing dyes