Tension-induced phase transformation and anomalous Poisson effect in violet phosphorene

Ying，Penghua1; Li，Xiaowen2; Qiang，Xiaobin2; Du，Yao1; Zhang，Jin1; Chen，Lang2; Zhong，Zheng1

2022-10-01

10.1016/j.mtphys.2022.100755

Materials Today Physics   影响因子和分区

2542-5293

2542-5293

Two-dimensional violet phosphorene (VP) nanosheets are promising semiconductor materials with unique cross structures distinct from those of their allotropes such as black phosphorene and blue phosphorene, but their mechanical behaviors remain almost unexplored. By using the first-principles calculations, in this paper we investigate the mechanical behaviors of monolayer, bilayer, and bulk VP under uniaxial tension. A phase transformation from the open-pore phase to closed-pore phase is observed in VP structures when under a specific tensile strain. It is revealed that the phase transformation is attributed to the competition between the rotation and elongation of sub-nano rods in VP structures during the loading process. Due to the phase transformation, the in-plane Poisson's ratio of monolayer VP can become greater than 1.2, while the bulk VP possesses a negative out-of-plane Poisson's ratio with a magnitude up to -0.3 at a certain strain. These results indicate that Poisson effects in VP are superior to those in any other existing two-dimensional materials. In addition, based on the tensor analysis of elastic constants, a strong mechanical anisotropy is observed in VP structures both before and after the phase transformation. Besides the mechanical properties, the band gap of all VP structures decreases as the applied tensile strain increases, which can eventually transform into the metallic state prior to their fracture. The combination of unique phase transformation, anomalous Poisson effect, strong mechanical anisotropy and tunable electronic properties render VP be a novel nanoscale metamaterial with multifunctional applications.

Mechanical anisotropy Phase transformation Poisson's ratio Strain engineering Violet phosphorene

SCI ; EI

英语

通讯

National Natural Science Foundation of China[11772106];National Natural Science Foundation of China[11932005];National Key Research and Development Program of China[2018YFB1502602];National Natural Science Foundation of China[51972160];

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied

WOS:000861568400002

ELSEVIER

20222712328580

Anisotropy ; Calculations ; Electronic properties ; Energy gap ; Nanorods ; Phase transitions ; Poisson ratio ; Semiconductor materials ; Tensile strain

Semiconducting Materials:712.1 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Mathematics:921 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Solid State Physics:933 ; Materials Science:951

2-s2.0-85133434896

Scopus

1.School of Science,Harbin Institute of Technology,Shenzhen,518055,China
2.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Ying，Penghua,Li，Xiaowen,Qiang，Xiaobin,et al. Tension-induced phase transformation and anomalous Poisson effect in violet phosphorene[J]. Materials Today Physics,2022,27.

Ying，Penghua.,Li，Xiaowen.,Qiang，Xiaobin.,Du，Yao.,Zhang，Jin.,...&Zhong，Zheng.(2022).Tension-induced phase transformation and anomalous Poisson effect in violet phosphorene.Materials Today Physics,27.

Ying，Penghua,et al."Tension-induced phase transformation and anomalous Poisson effect in violet phosphorene".Materials Today Physics 27(2022).