Tungsten Ditelluride Powder


In stock (price excludes taxes)
Order Code: M2112C1
MSDS sheet

Pricing

Product Code Quantity Price
M2112C1 500 mg £168.8
M2112C1 1 g £269.2

General Information

CAS number 12067-76-4
Chemical formula WTe2
Molecular weight 439.04 g/mol
Bandgap ~0.7 eV [1]
Synonyms Tungsten telluride, Tungsten (IV) telluride
Classification / Family Transition metal dichalcogenides (TMDCs), 2D semiconductor materials, Semi-metal, NIR band-gap, Nano-electronics, Nano-photonics, Transistors, Photovoltaics, Materials science

Product Details

Form Powder
Preparation Synthetic - Chemical Vapour Transport (CVT)
Purity ≥ 99.995%
Structure Orthorhombic 1T(Td)
Electronic properties 2D semiconductor, semi-metal nature
Melting point ‎‎1020 °C (lit.)
Colour Metallic Black

 

General Description

Tungsten ditelluride (WTe2) is considered 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).

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.

wte2 abc structure

Distorted Td-WTe2 structure (top view).

However, the small energy difference between the Td and 2H structures of WTe2 shows it has various applications in phase-transition devices.

Applications

Tungsten ditelluride (WTe2)  thin-layer nanosheets (produced by the liquid exfoliation method) have various applications, such as in energy conversion and storage, superconductivity and quantum spin Hall effect, etc.

Synthesis

Tungsten ditelluride (WTe2) powder is obtained via CVT, with purity > 99.995%.

Usage

WTe2 powder is suitable for liquid chemical exfoliation to prepare WTe2 nanoparticles and nanosheets down to few-layer films. High-purity WTe2 powders can also be used in chemical vapour deposition to create mono-layer films.

 

Literature and Reviews

  1. Tungsten Ditelluride: a layered semimetal, C-H. Lee et al., Sci. Rep., 5, 10013 (2015); DOI: 10.1038/srep10013.
  2. Tungsten dichalcogenides (WS2, WSe2, and WTe2): materials chemistry and applications, A. Eftekhari, J. Mater. Chem. A, 5, 18299-18325 (2017); DOI: 10.1039/C7TA04268J.
  3. 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.
  4. 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.
  5. 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.