Two-dimensional Mo(SCN)₂: a novel MoS₂-variant.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Solid State Chemistry

Background:

• Two-dimensional (2D) materials, particularly transition metal dichalcogenides (TMDCs), are a significant focus in materials science.
• TMDCs exhibit unique electronic and optical properties, driving research into new material classes.

Purpose of the Study:

• To computationally explore a novel family of 2D materials analogous to TMDCs.
• To identify stable 2D polymorphs of molybdenum di-thiocyanate (Mo(SCN)2) and investigate their electronic properties.

Main Methods:

• First-principles calculations were employed to predict the structural and electronic properties of Mo(SCN)2.
• Density Functional Theory (DFT) was used to determine the stability and electronic band structures of various polymorphs.

Main Results:

• Several stable 2D polymorphs of Mo(SCN)2 were identified, exhibiting structural similarities to MoS2.
• The most stable Mo(SCN)2 polymorphs were found to be semiconductors with small energy band gaps.
• A higher-energy Mo(SCN)2 polymorph displayed metallic characteristics.

Conclusions:

• Mo(SCN)2 represents a promising new class of 2D materials with tunable electronic properties.
• The calculated formation energies suggest that the synthesis of Mo(SCN)2 is feasible, comparable to MoS2.
• This discovery opens avenues for exploring complex chalcogen-analogue 2D materials.