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The Stability Mechanism of Borophene Edges
Xiaojing Yao1, Zhiheng Ji1, Jinxin Sun2
1College of Physics and Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050024, China.
Inorganic Chemistry
|February 2, 2026
Summary
Borophene edges are less stable than graphene edges and highly sensitive to configuration. Machine learning reveals stability depends on specific atomic arrangements, particularly the density of 4-coordinated boron atoms.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Computational Chemistry
Background:
- The edges of two-dimensional (2D) materials significantly influence their properties and synthesis.
- Borophene, a highly isomer-abundant 2D material, has underexplored edge structures and stabilization mechanisms.
Purpose of the Study:
- To systematically investigate the edge structures and stabilization mechanisms of various borophene phases (α, α1, β1, β12, χ3).
- To identify key factors governing borophene edge stability and compare it with graphene.
Main Methods:
- Density Functional Theory (DFT) calculations to model borophene edge structures.
- Machine learning (ML) approach to develop a global descriptor for edge stability.
- Mechanistic analysis correlating edge stability with atomic coordination.
Main Results:
- Borophene edge stability is configuration-dependent and generally lower than graphene.
- Double-chain width edges are the most stable; zigzag and comblike edges show instability and reconstruction.
- Edge stability correlates positively with 4-coordinated B atoms (n4) and negatively with 3-coordinated B atoms (n3).
Conclusions:
- Edge configuration is critical for borophene stability.
- The developed ML descriptor provides insight into edge stability determinants.
- Findings advance understanding of borophene and other 2D material edge physics.
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