Strong in-plane anisotropy in the electronic properties of doped transition metal dichalcogenides exhibited in W1−xNbxS2

Abstract

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Full Composition Tuning of W1–xNbxSe2 Alloy Nanosheets to Promote the Electrocatalytic Hydrogen Evolution Reaction

“…The clustering feature was previously observed for Nb (7% or 10%)-doped WS 2 and Nb (12.8%)-doped WSe 2 , which were synthesized using CVD (at 550 or 1000 °C) and CVT (at 1000 °C), respectively. 13,21,22 The Mo 0.5 W 0.5 S 2 (synthesized using CVD at 800 °C) and Re 0.5 Nb 0.5 S 2 (synthesized using CVT at 930− 960 °C) crystals also showed the stripe-type atomic ordering. 41,42 Therefore, it is no striking issue to observe the separated domains for the present W 1−x Nb x Se 2 nanosheets synthesized at the lower temperatures.…”

“…19,20 Scanning transmission electron microscopy (STEM) images revealed the anisotropic atomic distribution with clusters or stripes of Nb (∼10%) doped in WS 2 or WSe 2 . 13,21,22 Salehi-Khojin's group predicted theoretically the homogeneous single phase of the W 1−x Nb x Se 2 alloy at 780 K and synthesized it at 1300 K. 23 Researchers have synthesized composition-tuned W 1−x Nb x Se 2 crystals using chemical vapor transport or monolayer films using CVD at 850 °C. 24,25 The direct observation of the W 1−x Nb x Se 2 structure at the atomic scale is essential to understanding their properties, but there has been no reported analysis over a wide composition range.…”

“…The semiconducting WSe 2 and the metallic NbSe 2 both have a thermodynamically stable 2H phase, but have different stacking sequences . Many research groups tried to incorporate Nb into WS 2 or WSe 2 to effectively decrease the band gap with p-type doping. − Chemical vapor deposition (CVD) often produces a NbSe 2 phase segregated from the alloy, forming the heterojunction of NbSe 2 –W 1– x Nb x Se 2 ( x = 0.6). , Scanning transmission electron microscopy (STEM) images revealed the anisotropic atomic distribution with clusters or stripes of Nb (∼10%) doped in WS 2 or WSe 2 . ,, Salehi-Khojin’s group predicted theoretically the homogeneous single phase of the W 1– x Nb x Se 2 alloy at 780 K and synthesized it at 1300 K . Researchers have synthesized composition-tuned W 1– x Nb x Se 2 crystals using chemical vapor transport or monolayer films using CVD at 850 °C. , The direct observation of the W 1– x Nb x Se 2 structure at the atomic scale is essential to understanding their properties, but there has been no reported analysis over a wide composition range.…”

Substitutional effect of Ti-based AB2 hydrogen storage alloys: A density functional theory study

“…The DE F of different alloys as a function of electronegativity of C atom were shown in Fig. 4, where DE F is defined as the difference of formation energy between Ti 1Àx C x B 2 alloys with clustered substitute distribution and isolated substitute distribution [47]. Note that in the clustered substitute distribution, the substituted C atoms were placed at the nearest distances among all A-site positions.…”

Unidirectional Rashba spin splitting in single layer WS2(1−x)Se2x alloy

“…In practice, real ternary material often exhibits a more complex structure in which chemical fluctuations are spatially correlated. Several studies concerning TMDs alloys [71][72][73] have demonstrated that fluctuations along the growth direction can lead to ordered configurations in the form of atomic chains oriented parallel to the flake edges (i.e. zigzag directions), akin to ordering observed in the epitaxy of 3D bulk crystals [74].…”