Elastic Properties and Fracture Behaviors of Biaxially Deformed, Polymorphic MoTe2

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

doi:10.1021/acs.nanolett.8b03833

Title: Elastic Properties and Fracture Behaviors of Biaxially Deformed, Polymorphic MoTe₂

Journal Article · Wed Jan 09 00:00:00 EST 2019 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.8b03833· OSTI ID:1543689

Sun, Yufei ^[1]; Pan, Jinbo ^[2]; Zhang, Zetao ^[1]; Zhang, Kenan ^[1]; Liang, Jing ^[3]; Wang, Weijun ^[4]; Yuan, Zhiquan ^[1]; Hao, Yukun ^[1]; Wang, Bolun ^[1]; Wang, Jingwei ^[4]; Wu, Yang ^[1]; Zheng, Jingying ^[1];

^[1];

^[5];

^[3];

^[4];

^[5]; Xu, Yong ^[6]; Yan, Qimin ^[2];

^[1]

Tsinghua Univ., Beijing (China)
Temple Univ., Philadelphia, PA (United States)
Peking Univ., Beijing (China)
Southern Univ. of Science and Technology, Shenzhen (China)
Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Tsinghua Univ., Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China); RIKEN Center for Emergent Matter Science (CEMS), Saitama (Japan)

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. Furthermore, 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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Temple Univ., Philadelphia, PA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Guangdong-Hong Kong joint innovation project; Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics; National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; NSFC

Grant/Contract Number:: AC02-05CH11231; SC0012575; 2016A050503012; KF201603; 51602173; 11774191; 2018YFA0208400; 51788104

OSTI ID:: 1543689

Journal Information:: Nano Letters, Vol. 19, Issue 2; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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Title: Elastic Properties and Fracture Behaviors of Biaxially Deformed, Polymorphic MoTe2

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Title: Elastic Properties and Fracture Behaviors of Biaxially Deformed, Polymorphic MoTe₂