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Anisotropic thermal conductivity in direction-specific black phosphorus nanoflakes

Abstract

Herein, the authors report our pioneering demonstration of the anisotropic thermal properties of black phosphorus (BP) nanoflakes. The nano-flakes were produced using a scotch tape-based mechanical exfoliation technique. Their thickness was characterized using Atomic Force Microscopy The anisotropic direction of the nanoflakes was determined by the Raman Spectroscopy equipped with a polarized laser. Then, a temperature-dependent Raman spectroscopy method was utilized to study the thermal transport properties of the BP nanoflakes. The results indicated that the thermal conductivities of zigzag BP and armchair nanoflakes are 30.6 and 12.6 W/m•K, respectively. This fundamental thermal study gives insight into the future fabrication of nanoscale electronic devices with thermal properties that can be well controlled.

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Acknowledgments

This work was partly supported by National Natural Science Foundation of China (No. 51802258) and project funded by the China Postdoctoral Science Foundation (No. 2018M643698).

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Correspondence to Heguang Liu.

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These authors contributed equally to this work.

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Liu, H., Liu, J., Jing, R. et al. Anisotropic thermal conductivity in direction-specific black phosphorus nanoflakes. MRS Communications 9, 1311–1316 (2019). https://doi.org/10.1557/mrc.2019.127

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