期刊
NANO LETTERS
卷 21, 期 6, 页码 2356-2362出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04154
关键词
two-dimensional materials; auxetic materials; borophene; buckling structure; first-principle calculations
类别
资金
- National Natural Science Foundation of China [11847017, 11904077]
- Science Foundation of Hebei Normal University [L2019B09]
- Hebei Province [E2019050018]
- Alexander von Humboldt Foundation
- Singapore MOE AcRF Tier 2 [MOE2019-T2-1-001]
The study demonstrates a novel material property, half-auxeticity, which expands normal to the direction of stress even under tension or compression. This property is achieved by decorating borophene sheet with Pd atoms, exhibiting negative Poisson ratio behavior.
Upon strain, most materials shrink normal to the direction of applied strain. Similarly, if a material is compressed, it will expand in the direction orthogonal to the pressure. Few materials, those of negative Poisson ratio, show the opposite behavior. Here, we show an unprecedented feature, a material that expands normal to the direction of stress, regardless if it is strained or compressed. Such behavior, namely, half-auxeticity, is demonstrated for a borophene sheet stabilized by decorating Pd atoms. We explore Pd-decorated borophene, identify three stable phases of which one has this peculiar property of half auxeticity. After carefully analyzing stability and mechanical and electronic properties we explore the origin of this very uncommon behavior and identify it as a structural feature that may also be employed to design further 2D nanomaterials.
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