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

Author

Zhou, Jingzhuo, Zhu, Mengya, Han, Ying, Zhou, Xuefeng, Wang, Shanmin, Chen, Juzheng, Wu, Hao, Hou, Yuan, and Lu, Yang

Subjects
YOUNG'S modulus, TENSILE tests, DIELECTRIC properties, THERMAL conductivity, COVALENT bonds, BORON nitride
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2024
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