Ossila Niobium Diselenide (NbSe2) Powder and Crystals M2302A25

This Ossila product (M2302A25) is a medium-sized bulk crystal of niobium diselenide (NbSe2, CAS 12034-77-4) in the 2H phase, with a typical area of ≥25 mm2 and purity of ≥99.999%. Grown synthetically by chemical vapor transport (CVT), it serves mainly as a source for producing single-layer or few-layer NbSe2 sheets by mechanical or liquid exfoliation.

NbSe2 is a group-V transition metal dichalcogenide (TMDC) and a 2D metal. Its layered hexagonal lattice consists of Se–Nb–Se sandwiches, with each Nb atom held in a trigonal prismatic cage of six Se atoms; neighbouring layers are held together by van der Waals forces. The 2H polytype is superconducting, with Tc ≈ 7.2 K, and atomically thin sheets show charge-density waves coexisting with superconductivity at low temperatures (T CDW = 33 K).

Crystals and the films exfoliated from them are suited to examination by atomic force microscopy or transmission electron microscopy. Crystal area is a typical representative value and individual pieces may vary.

• Preparing monolayer and few-layer NbSe2 sheets by mechanical or liquid exfoliation.
• Studying superconductivity, Ising superconductivity and charge-density-wave behaviour in 2D materials.
• Characterising exfoliated films with atomic force microscopy or transmission electron microscopy.
• Research into next-generation electronics, optoelectronics and nanotechnology.
• Exploring NbSe2 for energy storage, hydrogen evolution catalysis and photodetector devices.

• Product code: M2302A25
• Product Code: M2302A25
• Size: Medium (≥25 mm2)
• M​olecular Weight: 250.83 g/mol
• Preparation: Synthetic - Chemical Vapor Transport (CVT)
• Structure: Hexagonal
• Electronic Properties: 2D metal and superconductor
• Melting Point: >1300 °C
• Color: Dark Grey/Black
• Synonyms: Niobium(IV) selenide, Columbium selenide, Bis(selanylidene)niobium

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