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Abnormal thermal conductivity enhancement in covalently bonded bilayer borophene allotrope

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Abstract

Thermal conductivity of two-dimensional (2D) materials has gained prominence due to the attractive applications in thermal management and thermoelectric devices. In this work, we present a new member of bilayer 2D boron allotropes, denoted as bilayer β12 borophene, and study the thermal transport properties by solving phonon Boltzmann transport equation based on density functional theory. Based on quantitative chemical bonding analysis, we identify large degrees of covalent bonding of the interlayer interaction. In comparison to its monolayer counterpart, the bilayer exhibits much higher in-plane thermal conductivity despite the lower phonon group velocity and buckling structure, inferring a new physical mechanism. The thermal conductivity (κ) of bilayer β12 borophene at 300 K is 140.5 (86.3) W·m−1·K−1 along armchair (zigzag) direction, and κarmchair is about 52.7% higher than that of monolayer β12 borophene. The abnormal enhancement is attributed to the suppressed phonon scattering possibility and elongation of phonon lifetime. More interesting, after forming bilayer β12 borophene through interlayer covalent bonding, the dominated phonon branch to thermal conductivity changes to transverse acoustic phonons from out-of-plane flexural acoustic (ZA) phonons in the monolayer borophene. Our study elucidates the rich thermal transport characteristics in bilayer covalently bonded 2D materials, and injects fresh insights into the phonon engineering of 2D borophene relevant for emergent thermal management applications.

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Acknowledgements

We gratefully acknowledge funding supporting from the National Natural Science Foundation of China (No. 11804040) and the Scientific and Technological Research of Chongqing Municipal Education Commission (No. KJZD-K202100602), G. Z. is supported in part by RIE2020 Advanced Manufacturing and Engineering Programmatic (No. A1898b0043).

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  1. Yan Yin and Yanxiao Hu contributed equally to this work.

Authors and Affiliations

  1. School of Science, Chongqing University of Posts and Telecommunications, Chongqing, 400065, China

    Yan Yin, Yanxiao Hu, Shichang Li, Guangqian Ding & Dengfeng Li

  2. Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges Reservoir Area, Chongqing Three Gorges University, Chongqing, 404000, China

    Shifa Wang

  3. Institute of High Performance Computing, A*STAR, Singapore, 138632, Singapore

    Gang Zhang

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  1. Yan Yin
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Yin, Y., Hu, Y., Li, S. et al. Abnormal thermal conductivity enhancement in covalently bonded bilayer borophene allotrope. Nano Res. 15, 3818–3824 (2022). https://doi.org/10.1007/s12274-021-3921-y

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