Direct measurement of tensile mechanical properties of few-layer hexagonal boron nitride (h-BN)

Zhou, Jingzhuo1; Zhu, Mengya1; Han, Ying1; Zhou, Xuefeng2; Wang, Shanmin2; Chen, Juzheng1; Wu, Hao1; Hou, Yuan1,3; Lu, Yang3

2024-06-14

10.1063/5.0209443

JOURNAL OF APPLIED PHYSICS   影响因子和分区

0021-8979

1089-7550

Hexagonal boron nitride (h-BN) has excellent thermal conductivity and dielectric properties, which shows great potential for low-dimensional devices. However, mechanical properties of h-BN have not been comprehensively investigated through experiments. In this work, we conduct in situ direct tensile tests on freestanding single-crystal few-layer h-BN nanosheets with various layer numbers from 3 to 8, with an elaborate sample transfer and characterization protocol. Young's modulus of 573.8 +/- 101.4 GPa and a tensile fracture strain up to 3.2% are revealed, which are comparable to its monolayer counterpart. Moreover, we find a tough-to-brittle transition in few-layer h-BN with the increase in layer number, which is attributed the interplay between the van der Waals interaction and in-plane covalent bonding. These findings could open up new possibilities in mechanical research of van der Waals materials and provide guidance for the design of h-BN-based devices and composites.

SCI ; EI

英语

其他

Research Grants Council, University Grants Committee10.13039/501100002920[N_HKU159/22] ; NSFC/RGC Joint Research Scheme[SGDX2020110309300301] ; Shenzhen-Hong Kong-Macau Technology Research Program[RFS2021-1S05]

Physics

Physics, Applied

WOS:001244474600013

AIP Publishing

PHYSICS

Web of Science

1.City Univ Hong Kong, Dept Mech Engn, Kowloon, Hong Kong 999077, Peoples R China
2.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China
3.Univ Hong Kong, Dept Mech Engn, Pokfulam, Hong Kong 999077, Peoples R China

Zhou, Jingzhuo,Zhu, Mengya,Han, Ying,et al. Direct measurement of tensile mechanical properties of few-layer hexagonal boron nitride (h-BN)[J]. JOURNAL OF APPLIED PHYSICS,2024,135(22).

Zhou, Jingzhuo.,Zhu, Mengya.,Han, Ying.,Zhou, Xuefeng.,Wang, Shanmin.,...&Lu, Yang.(2024).Direct measurement of tensile mechanical properties of few-layer hexagonal boron nitride (h-BN).JOURNAL OF APPLIED PHYSICS,135(22).

Zhou, Jingzhuo,et al."Direct measurement of tensile mechanical properties of few-layer hexagonal boron nitride (h-BN)".JOURNAL OF APPLIED PHYSICS 135.22(2024).