Tungsten Ditelluride (WTe2) Powder and Crystal

CAS Number 12067-76-4

2D Materials, Low Dimensional Materials, Materials, Transition Metal Chalcogenides (TMCs), Transition Metal Dichalcogenides (TMDs)

Tungsten Ditelluride (WTe2) Powder and Crystal CAS 12067-76-4

Low price, high purity 2D tungsten ditelluride (WTe₂) powder and crystals

Suitable for the creation of single or few-layer sheets via mechanical or liquid exfoliation

Tungsten ditelluride (WTe₂), CAS number 12067-76-4, is a combination of the heaviest element in the common transition metal dihalcogenides (TMDCs) and a non-magnetically-thermoelectric semimetal (with reduced density of states at the Fermi level).

2D-layered tungsten ditelluride (WTe₂) has recently received great research interest for its unique, non-saturating, and extremely large positive magnetoresistance (XMR) behaviour. With perfectly balanced electron-hole populations, this particular non-saturating XMR identified applications for WTe₂ in information processing and storage devices.

Td-WTe₂ was the first material proposed to be a type II Weyl semimetal, with a reduced density of states at the Fermi level coming from a small overlap between valence and conduction bands without a band gap. It has been reported that even single and dual-layer WTe₂ films preserve the semimetallic nature, and both the films have equal hole and electron carrier concentrations. Additionally, WTe₂ has been reported to exhibit pressure-induced superconductivity.

High Purity

>99.999% Tungsten Ditelluride Purity

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Quick and reliable shipping

Low Cost

Low Cost Tungsten Ditelluride

Powder & Crystal

Different Forms of Tungsten Ditelluride

We supply low price tungsten ditelluride in several different forms for a range of applications.

Tungsten Ditelluride Powder

Can be used for preparation of tungsten ditelluride sulfide nanoplates and ultrathin films

Available in quantities of 500 mg or 1 g

≥99.995% purity

From £220

Tungsten Ditelluride Crystals by Size

Can be used to produce single or few-layer tungsten ditelluride sheets via mechanical or liquid exfoliation

Small (≥10 mm²) or medium (≥25 mm²) crystals available*

≥99.999% purity

From £520

*Typical representative size, areas/dimensions may vary

Bulk single tungsten ditelluride crystal is most commonly used as sources from which single or few-layer sheets can be obtained via either mechanical or liquid exfoliation. Single tungsten ditelluride crystal or films produced from such crystals are suitable for study using atomic force microscopy or transmission electron microscopy.

Few-layer WTe₂ nanosheets and nanoparticles can also obtained from tungsten ditelluride powder by liquid-exfoliation using sodium deoxycholate bile salt as surfactant. Topological Superconductivity can also be realised in potassium intercalated Td-WTe₂.

Technical Data

CAS Number	12067-76-4
Chemical Formula	WTe₂
Molecular Weight	439.04 g/mol
Bandgap	~0.7 eV [1]
Preparation	Synthetic - Chemical Vapour Transport (CVT)
Structure	Orthorhombic Td
Electronic Properties	2D semiconductor, type II Weyl semimetal
Melting Point	1020 °C (lit.)
Colour	Metallic black/Dark brown
Synonyms	Tungsten telluride, Tungsten(IV) telluride
Classification / Family	Transition metal dichalcogenides (TMDCs), 2D Semiconductor materials, Charge Density Wave (CDW), type II Weyl semimetal, Nano-electronics, Nano-photonics, Photovoltaic, Materials science

Product Details

Form	Purity
Powder	≥99.995%
Crystal	≥99.999%

Pricing Table

Product Code	Form	Size/Weight*	Price
M2112C1	Powder	500 mg	£220
M2112C1	Powder	1 g	£350
M2112A10	Crystal	Small (≥10 mm²)	£520 ea.
M2112A25	Crystal	Medium (≥25 mm²)	£850 ea.
M2112A00	Crystal	Large** (≥100 mm²)	£2300 ea.

*Typical representative size, areas/dimensions may vary

**Item with a lead time of 4 - 6 weeks, please contact for more information

Shipping is free for qualifying orders.

MSDS Documents

Tungsten ditelluride powder

Tungsten ditelluride crystal

Structure of Tungsten Ditelluride

Distorted Td-WTe₂ has proven to be the stable form over its semiconducting 2H-WTe₂ structure. The distortion is induced by the tungsten chains that are arranged along the a axis of the orthorhombic unit cell. Electrical resistance along the a axis increases markedly when a magnetic field is applied perpendicularly to the dichalcogenide layers (along the c axis), resulting in the large magnetoresistance (LMR) effect.

In ambient conditions, WTe₂ crystallises in a orthorhombic lattice - where tungsten atoms are coordinated by tellurium atoms in an octahedral environment. The unit cell contains two Te-W-Te layers (held together by van der Waals interaction), with one sheet rotating 180^◦ with respect to the other. This stacking sequence is referred to as a 'distorted 1T (Td) structure.

Tungsten ditelluride crystal structure — The crystal structure of single-layer tungsten ditelluride (WTe₂)

Properties of Tungsten Ditelluride

After exfoliation of tungsten ditelluride crystal or powder, tungsten ditelluride typically has the following properties:

Orthorhombic Td (space group: Pnm21)
Bulk WTe₂ is a type II Weyl semimetal
WTe₂ shows unique, non-saturating, and extremely large positive magnetoresistance (XMR) behaviour
WTe₂ exhibits pressure-induced superconductivity

Applications of Tungsten Ditelluride

Tungsten ditelluride single crystal can be used to prepare monolayer and few-layer WTe₂ by mechanical or liquid exfoliation, and tungsten ditelluride powder is suitable for liquid chemical exfoliation to prepare WTe₂ nanosheets and nanoparticles down to few-layer films.

Tungsten ditelluride (WTe₂) single crystals can be used to prepare monolayer and few-layer WTe₂ by mechanical or liquid exfoliation.

Tungsten ditelluride powder is suitable for liquid chemical exfoliation to prepare WTe₂ nanosheets and nanoparticles down to few-layer films. Intercalation of potassium into Td-WTe₂. can induce topological superconductivity with an ecident anisotropic behaviour.

With the distorted 1T (Td) form being thermodynamically-favoured and semi-metal in nature, WTe₂ finds applications in pressure-induced superconductivity, memory storage devices, energy storage devices such as batteries, catalyst, spintronics, and thermo-electric devices. Also having small bandgap (less than 1 eV), tungsten ditelluride is particularly interesting for applications in the near-infrared (NIR) wavelength.

Literature and Reviews

Tungsten Ditelluride: a layered semimetal, C-H. Lee et al., Sci. Rep., 5, 10013 (2015); DOI: 10.1038/srep10013.
Tungsten dichalcogenides (WS2, WSe2, and WTe2): materials chemistry and applications, A. Eftekhari, J. Mater. Chem. A, 5, 18299-18325 (2017); DOI: 10.1039/C7TA04268J.
Phase stability of transition metal dichalcogenide by competing ligand field stabilization and charge density wave, K. Santosh et al, 2D Mater. 2 035019 (2015); doi:10.1088/2053-1583/2/3/035019.

Structural Phase Transitions in Two-Dimensional Mo- and W- Dichalcogenide Monolayers, Nat. Commun., 5, 4214 (2014); K-A. N. Duerloo et al., DOI: 10.1038/ncomms5214.
Environmental Instability and Degradation of Single‐ and Few‐Layer WTe2 Nanosheets in Ambient Conditions, F. Ye et al., small, 12, No. 42, 5802-5808 (2016); DOI: 10.1002/smll.201601207.
Visualizing Type-II Weyl Points in Tungsten Ditelluride by Quasiparticle Interference, C-L. Lin et al., ACS Nano, 11 (11), 11459–11465 (2017); DOI: 10.1021/acsnano.7b06179
Three-dimensionality of the bulk electronic structure in WTe2, Y. Wu et al., Phys. Rev. B, 95, 195138 (2017) DOI: 10.1103/PhysRevB.95.195138.
Electronic Structure Basis for the Extraordinary Magnetoresistance in WTe2, I. Pletikosić et al., Phys. Rev. Lett., 113, 216601 (2014); DIO: 10.1103/PhysRevLett.113.216601.
MoTe2: A Type-II Weyl Topological Metal, Z. Wang et al., Phys. Rev. Lett., 117, 056805 (2016); DOI: 10.1103/PhysRevLett.117.056805.

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