| Title | Elastic Properties and Fracture Behaviors of Biaxially Deformed, Polymorphic MoTe2 |
| Authors | Sun, Yufei Pan, Jinbo Zhang, Zetao Zhang, Kenan Liang, Jing Wang, Weijun Yuan, Zhiquan Hao, Yukun Wang, Bolun Wang, Jingwei Wu, Yang Zheng, Jingying Jiao, Liying Zhou, Shuyun Liu, Kaihui Cheng, Chun Duan, Wenhui Xu, Yong Yan, Qimin Liu, Kai |
| Affiliation | Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Sch Mat Sci & Engn, Beijing 100084, Peoples R China Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Dept Phys, Beijing 100084, Peoples R China Tsinghua Univ, Tsinghua Foxconn Nanotechnol Res Ctr, Beijing 100084, Peoples R China Tsinghua Univ, Ctr Nano & Micromech, Beijing 100084, Peoples R China Tsinghua Univ, Key Lab Organ Optoelect & Mol Engn, Minist Educ, Dept Chem, Beijing 100084, Peoples R China Tsinghua Univ, Inst Adv Study, Beijing 100084, Peoples R China Temple Univ, Dept Phys, Philadelphia, PA 19122 USA Peking Univ, Sch Phys, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China Collaborat Innovat Ctr Quantum Matter, Beijing 100084, Peoples R China RIKEN, CEMS, Wako, Saitama 3510198, Japan |
| Keywords | MoTe2 elastic properties phase transition nanoindentation |
| Issue Date | 2019 |
| Publisher | NANO LETTERS |
| Abstract | Biaxial deformation of suspended membranes widely exists and is used in nanoindentation to probe elastic properties of structurally isotropic two-dimensional (2D) materials. However, the elastic properties and, in particular, the fracture behaviors of anisotropic 2D materials remain largely unclarified in the case of biaxial deformation. MoTe2 is a polymorphic 2D material with both isotropic (2H) and anisotropic (1T' and T-d) phases and, therefore, an ideal system of single-stoichiometric materials with which to study these critical issues. Here, we report the elastic properties and fracture behaviors of biaxially deformed, polymorphic MoTe2 by combining temperature-variant nanoindentation and first-principles calculations. It is found that due to similar atomic bonding, the effective moduli of the three phases deviate by less than 15%. However, the breaking strengths of distorted 1T' and T-d phases are only half the value of 2H phase due to their uneven distribution of bonding strengths. Fractures of both isotropic 2H and anisotropic 1T' phases obey the theorem of minimum energy, forming triangular and linear fracture patterns, respectively, along the orientations parallel to Mo-Mo zigzag chains. Our findings not only provide a reference database for the elastic behaviors of versatile MoTe2 phases but also illuminate a general strategy for the mechanical investigation of any isotropic and anisotropic 2D materials. |
| URI | http://hdl.handle.net/20.500.11897/551010 |
| ISSN | 1530-6984 |
| DOI | 10.1021/acs.nanolett.8b03833 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 物理学院 |
