Pricing

Product Code	Quantity	Price
M2145C1	1 g	£268.00

General Information

CAS number	‎12039-55-3
Chemical formula	TaSe2
Molecular weight	338.87 g/mol
Bandgap	n/a
Synonyms	Tantalum (IV) selenide, Bis(selanylidene)tantalum
Classification / Family	Transition metal dichalcogenides (TMDCs), 2D charge density wave (CDW)materials, Nano-electronics, Nano-photonics, Superconductivity, Photovoltaic, Materials science

Product Details

Form	Powder
Preparation	Synthetic - chemical vapour transport (CVT)
Purity	≥ 99.995%
Structure	Hexagonal
Electronic properties	2D CDW materials
Melting point	n/a
Appearance	Dark powder

General Description

Tantalum diselenide (TaSe₂), with a crystal structure of hexagonal symmetry, is another family member of transition metal dichalcogenides (TMDCs). It is metallic nature at room temperature.

In its bulk form, 2H-TaSe₂ showed two-step charge-density-wave (CDW) transitions. The first transition from the metallic phase to the incommensurate charge-density-wave (ICDW) phase was at 123K, The next was a commensurate charge-density-wave (CCDW) phase transition at 90K, followed by a superconducting transition at low temperature (Tc ∼ 0.2 K).

Applications

Besides being an important CDW material, TaSe₂ has several other interesting applications. It can function as an interconnect in devices, as well as an energy storage device material with intercalation of lithium ions and high volumetric capacitors.

Synthesis

Tantalum diselenide powder is obtained via  the CVT method, with a purity in excess of 99.995% achieved.

Usage

Tantalum diselenide powder is suitable for liquid chemical exfoliation to prepare TaSe₂ nanosheets and nanoparticles down to few-layer films. TaSe₂ powder is also used in the preparation of mono-layer and few-layer films via chemical vapour deposition (CVD).

Literature and Reviews

1. Mechanical Exfoliation and Characterization of Single and Few-Layer Nanosheets of WSe2 , TaS2 , and TaSe2, H. Li et al, small, 9, No. 11, 1974–1981 (2013); DOI: 10.1002/smll.201202919.
2. Zone-Folded Phonons and the Commensurate−Incommensurate Charge-Density-Wave Transition in 1T‑TaSe2 Thin Films, R. Samnakay et al.,  Nano Lett., 15, 2965−2973 (2015); DOI: 10.1021/nl504811s.
3. Direct observation of an optically induced charge density wave transition in 1T-TaSe2, S. Sun et al., Phys. Rev. B., 92, 224303 (2015); doi: 10.1103/PhysRevB.92.224303.
4. Contrast and Raman spectroscopy study of single- and few-layered charge density wave material: 2H-TaSe2, P. Hajiyev et al., Sci. Rep., 3 : 2593 (2013); DOI: 10.1038/srep02593.
5. Structural, electronic and vibrational properties of few-layer 2H- and 1T-TaSe2, J. Yan et al., Sci. Rep., 5 : 16446 (2013); DOI: 10.1038/srep16646.
6. Dimensional reduction and ionic gating induced enhancement of superconductivity in atomically thin crystals of 2H-TaSe2, Nanotech., 30, 035702 ((2019); doi:10.1088/1361-6528/aaea3b.

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To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.

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