Abstract
AbstractTwo-dimensional (2D) materials exhibit remarkable mechanical properties, enabling their applications as flexible and stretchable ultrathin devices. As the origin of several extraordinary mechanical behaviors, ferroelasticity has also been predicted theoretically in 2D materials, but so far lacks experimental validation and investigation. Here, we present the experimental demonstration of 2D ferroelasticity in both exfoliated and chemical-vapor-deposited β’-In2Se3 down to few-layer thickness. We identify quantitatively 2D spontaneous strain originating from in-plane antiferroelectric distortion, using both atomic-resolution electron microscopy and in situ X-ray diffraction. The symmetry-equivalent strain orientations give rise to three domain variants separated by 60° and 120° domain walls (DWs). Mechanical switching between these ferroelastic domains is achieved under ≤0.5% external strain, demonstrating the feasibility to tailor the antiferroelectric polar structure as well as DW patterns through mechanical stimuli. The detailed domain switching mechanism through both DW propagation and domain nucleation is unraveled, and the effects of 3D stacking on such 2D ferroelasticity are also discussed. The observed 2D ferroelasticity here should be widely available in 2D materials with anisotropic lattice distortion, including the 1T’ transition metal dichalcogenides with Peierls distortion and 2D ferroelectrics such as the SnTe family, rendering tantalizing potential to tune 2D functionalities through strain or DW engineering.
Authors
12
- Chao Xu (first)
- Jianfeng Mao (additional)
- Xuyun Guo (additional)
- Shanru Yan (additional)
- Yancong Chen (additional)
- Tsz Wing Lo (additional)
- Changsheng Chen (additional)
- Dangyuan Lei (additional)
- Xin Luo (additional)
- Jianhua Hao (additional)
- Changxi Zheng (additional)
- Ye Zhu (additional)
References
59
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Dates
Type | When |
---|---|
Created | 4 years, 2 months ago (June 16, 2021, 6:03 a.m.) |
Deposited | 2 years, 8 months ago (Dec. 2, 2022, 7:52 a.m.) |
Indexed | 1 week, 1 day ago (Aug. 12, 2025, 6:08 p.m.) |
Issued | 4 years, 2 months ago (June 16, 2021) |
Published | 4 years, 2 months ago (June 16, 2021) |
Published Online | 4 years, 2 months ago (June 16, 2021) |
Funders
4
Research Grants Council, University Grants Committee
10.13039/501100002920
Region: Asia
pri (Universities (academic only))
Labels
5
- 研究資助局
- 研究資助局
- 研究資助局
- 研究資助局
- 研究資助局
Awards
3
- PolyU 153033/17P
- 15305718
- 15303718
National Natural Science Foundation of China
10.13039/501100001809
Region: Asia
gov (National government)
Labels
11
- Chinese National Science Foundation
- Natural Science Foundation of China
- National Science Foundation of China
- NNSF of China
- NSF of China
- 国家自然科学基金委员会
- National Nature Science Foundation of China
- Guójiā Zìrán Kēxué Jījīn Wěiyuánhuì
- NSFC
- NNSF
- NNSFC
Awards
2
- 11832019
- 11804286
the Fundamental Research Funds for the Central Universities
The Hong Kong Polytechnic University Grant No. ZVRP
@article{Xu_2021, title={Two-dimensional ferroelasticity in van der Waals β’-In2Se3}, volume={12}, ISSN={2041-1723}, url={http://dx.doi.org/10.1038/s41467-021-23882-7}, DOI={10.1038/s41467-021-23882-7}, number={1}, journal={Nature Communications}, publisher={Springer Science and Business Media LLC}, author={Xu, Chao and Mao, Jianfeng and Guo, Xuyun and Yan, Shanru and Chen, Yancong and Lo, Tsz Wing and Chen, Changsheng and Lei, Dangyuan and Luo, Xin and Hao, Jianhua and Zheng, Changxi and Zhu, Ye}, year={2021}, month=jun }