Niobium Diselenide (NbSe2) Powder and Crystals

CAS Number 12034-77-4

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

MSDS

Niobium Diselenide (NbSe2) Powder and Crystals CAS 12034-77-4

Low price, high purity 2D metal niobium diselenide powder and crystals

For the development of next-generation electronics, optoelectronics, and nanotechnology

Technical Data | MSDS | Literature and Reviews | Related Products

Niobium diselenide (NbSe₂), CAS number 12034-77-4, belongs to group-V two-dimensional transition metal dichalcogenides (TMDCs). It is one of the intensively studied TMDCs due to the particular coexistence of charge-density waves (T_CDW = 33 K) and superconductivity (T_C = 7.2 K) in atomically thin NbSe₂ nanosheets at low temperatures.

High Purity

NbSe2 ≥99.999% high purity crystal

Powder & Crystal

Powder & Crystal Forms

Low Cost

Low Cost Niobium Diselenide

Applications

Development of next-generation electronics, optoelectronics, and nanotechnology

Bulk NbSe₂ has a lamellar crystal architecture to form a two-dimensional hexagonal lattice. Each monolayer NbSe2 is composed of three layers of atoms, a niobium layer sandwiched between two selenide layers with a covalent bond between Nb and Se in the Se–Nb–Se sequence. Each Nb atom sits inside a trigonal prismatic cage formed by six nearest neighbouring Se atoms while the Nb atoms form a perfect hexagonal close-packed structure.

NbSe₂ has low ion diffusion barrier when applied in energy-storage systems, such as traditional lithium-ion batteries, and novel sodium-ion batteries (SIBs) and magnesium-ion batteries (MIBs). Exfoliated NbSe₂ nanoparticles and nanosheets find applications as electrodes for solar cells, catalysts for chemical reactions and hydrogen evolution reactions (HER), conducting lubricant in vacuum and various nonlinear and optoelectronics devices.

We supply low price niobium diselenide in several different forms for a range of applications.

Niobium Diselenide Powder

Can be used for preparation of niobium diselenide nanoplates and ultrathin films

Sold by weight

≥99.995% purity

From £220

Niobium Diselenide Crystals by Size

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

Niobium diselenide powder can also be used to prepare NbSe₂ nanosheets and nanoparticles by liquid-exfoliation (normally assisted by sonication or microwave heating). Foreign elements or materials can be intercalated into niobium diselenide layered structure to change its conductivity, heat capacity and superconductivity.

Technical Data

CAS Number	‎12034-77-4
Chemical Formula	NbSe₂
Molecular Weight	250.83 g/mol
Bandgap	n.a.
Preparation	Synthetic - Chemical Vapour Transport (CVT)
Structure	Hexagonal
Electronic Properties	2D metal and superconductor
Melting Point	>1300 °C
Colour	Dark Grey/Black
Synonyms	Niobium(IV) selenide, Columbium selenide, Bis(selanylidene)niobium.
Classification / Family	Transition metal dichalcogenides (TMDCs), 2D semiconductor materials, Charge Density Wave (CDW), Hydrogen Revolution Reactions (HER), 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
M2302A1	Powder	500 mg	£220
Powder	1 g	M2302A1	£350
Crystal (2H-NbSe₂)	Small (≥10 mm²)	M2302C1	£520 ea.
Crystal (2H-NbSe₂)	Medium (≥25 mm²)	M2302C1	£850 ea.

*typical representative size, areas/dimensions may vary

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MSDS Documents

Niobium diselenide powder

Niobium diselenide crystal

Structure of Niobium Diselenide

Bulk NbSe₂ exhibits three stacking polytypes: 2H, 4H, and 3R phases and its monolayer 1T-NbSe₂phase is a Mott insulator.

Bulk NbSe₂ crystallizes into the 2H phase (trigonal prismatic structure, D_3h) and 2H-NbSe₂ is metallic layered material. Nb atoms are surrounded by Se atoms following a trigonal prismatic coordination with Nb being located in the centre of the trigonal prismatic sites. The Se-Nb-Se layers that make up each packet are covalently bound. The coupling between pairs of packets is bound by van der Waals forces.

2H-NbSe2 tops and side view of crystal structure — Top and side view of single-layer niobium diselenide (2H-NbSe₂)

Properties of 2D Niobium Diselenide

Exfoliated niobium diselenide typically has the following properties:

‎NbSe₂ (2H and 3R) is a metal, 2H-NbSe₂ polytype is known to be superconducting with a critical temperature of Tc ≈ 7.2 K while 3R-NbSe₂ is not superconducting.
Monolayer 1T-NbSe₂ was found to be a Mott insulator, with an energy gap of 0.4 eV.
Particular coexistence of charge-density waves and superconductivity at low temperatures
Observation of Ising superconductivity and strong enhancement of charge density wave order with reduced dimension.

Applications of Niobium Diselenide

Niobium diselenide single crystals can be used to prepare ultrathin nanosheets, ie.e monolayer and few-layer NbSe₂ by mechanical or liquid exfoliation, while niobium diselenide powder is suitable for liquid chemical exfoliation to prepare NbSe₂ nanosheets and nanoparticles down to few-layer films. Niobium diselenide powder is also good for intercalations to fill the gap between layers with different foreign materials and ions to improve its physical properties for different applications.

Niobium diselenide single crystal can be used to prepare monolayer and few-layer NbSe₂ by mechanical or liquid exfoliation. Niobium Diselenide powder is suitable for liquid chemical exfoliation to prepare NbSe₂ nanosheets and nanoparticles down to few-layer films. High quality 2D NbSe₂ nanosheets (NSs) can be successfully produced via an ultrasonic-assisted liquid phase exfoliation (LPE) from bulk NbSe₂powder in ethanol.

Exfoliated two-dimensional NbSe₂micro/nanoparticles show great lubricating property with low friction coefficient (0.3), mild wear, and longer wear lifetime (120 min). Intercalated layered NbSe₂demonstrates excellent cycle stability and rate performance for either sodium or lithium storage, showing great potential as anode for batteries. Porous NbSe₂nanosheets is a great potential electrocatalytic material candidate for hydrogen evolution reactions (HERs). NbSe₂ single-crystalline nanosheets array photodetectors give very high responsibility and external quantum efficiency to UV-light.

Literature and Reviews

High-quality monolayer superconductor NbSe2 grown by chemical vapour deposition, H. Wang et al., Nat. Commun., 8, 394 (2017); DOI: 10.1038/s41467-017-00427-5.
Anisotropic band splitting in monolayer NbSe2: implications for superconductivity and charge density wave, Y. Nakata et al., npj 2D Mater Appl 2, 12 (2018); DOI: 10.1038/s41699-018-0057-3.
Signature of coexistence of superconductivity and ferromagnetism in two-dimensional NbSe2 triggered by surface molecular adsorption, X. Zhu et al., Nat. Commun., 7, 11210 (2017); DOI: 10.1038/ncomms11210.

Ising pairing in superconducting NbSe2 atomic layers, X. Xi et al., Nat. Phys. 12, 139–143 (2016); DOI: 10.1038/nphys3538.
Strongly enhanced charge-density-wave order in monolayer NbSe2, X. Xi et al., Nat. Nanotech, 10, 765–769 (2015); DOI: 10.1038/nnano.2015.143.
Interlayer breathing and shear modes in NbSe2 atomic layers, R. He et al., 2D Mater., 3, 031008 (2016); DOI: 10.1088/2053-1583/3/3/031008.
Electrochemical Intercalation of Lithium Ions into NbSe2 Nanosheets, E. Hitz et al., ACS Appl. Mater. Interfaces 8, 11390−11395 (2016); DOI: 10.1021/acsami.5b11583.
Ising Superconductivity and Quantum Phase Transition in Macro-Size Monolayer NbSe2, Y. Xing et al., Nano Lett., 17, 11, 6802–6807 (2017); DOI: 10.1021/acs.nanolett.7b03026.
Unusual suppression of the superconducting energy gap and critical temperature in atomically thin NbSe2, E. Khestanova et al., Nano Lett., 18, 4, 2623–2629 (2018); DOI: 10.1021/acs.nanolett.8b00443.
Electronic transport in NbSe2 two-dimensional nanostructures: semiconducting characteristics and photoconductivity, Y. Huang et al., Nanoscale, 7, 18964 (2015); DOI: 10.1039/c5nr05430c.
Lithium- and Magnesium-Storage Mechanisms of Novel Hexagonal NbSe2, C. Peng et al., ACS Appl. Mater. Interfaces, 10, 36988−36995 (2018); DOI: 10.1021/acsami.8b12662.
Safe-by-Design Exfoliation of Niobium Diselenide Atomic Crystals as a Theory-Oriented 2D Nanoagent from Anti-Inflammation to Antitumor, Z. Miao et al., Adv. Funct. Mater. 2020, 2001593 (2020); DOI: 10.1002/adfm.20200159.

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