Tungsten Ditelluride (WTe2) Powder and Crystal
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) 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.
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
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*
*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.
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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.
Key Product Data
- High purity tungsten ditelluride powder and crystals
- Sold according to weight or size respectively
- Low price with free worldwide shipping on qualifying orders
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.
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.
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.
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.
|Molecular Weight||439.04 g/mol|
|Bandgap||~0.7 eV |
|Preparation||Synthetic - Chemical Vapour Transport (CVT)|
|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|
|M2112A10||Crystal||Small (≥10 mm2)||£480.00 ea.|
|M2112A25||Crystal||Medium (≥25 mm2)||£760.00 ea.|
|M2112A00||Crystal||Large** (≥100 mm2)||£2100.00 ea.|
*typical representative size, areas/dimensions may vary
**item with a lead time of 4 - 6 weeks, please contact for more information
To the best of our knowledge the information provided here is accurate. However, Ossila assume no liability for the accuracy of this page. The values provided are typical at the time of manufacture and may vary over time and from batch to batch. All products are for laboratory and research and development use only, and may not be used for any other purpose including health care, pharmaceuticals, cosmetics, food or commercial applications.