Thickness-dependent and anisotropic thermal conductivity of black phosphorus nanosheets†,Nanoscale

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Thickness-dependent and anisotropic thermal conductivity of black phosphorus nanosheets†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-21 00:00:00 , DOI: 10.1039/c8nr00421h
Seong Gi Jeon _{1,

2,

3,

4,

5} , Hosun Shin _{1,

2,

3,

4} , Yun Hwan Jaung _{1,

2,

3,

4,

5} , Jinho Ahn _{4,

5,

6,

7} , Jae Yong Song _{1,

2,

3,

4}

Affiliation

Thickness effects on thermal conductivities of black phosphorus nanosheets, which are anisotropic in the zigzag and armchair planar directions, are experimentally and theoretically investigated in the thickness range of 13 to 48 nm. The thermal conductivities decrease with the thickness, decreasing from 13 to 8 W m⁻¹ K⁻¹ in the zigzag direction and from 10 to 6 W m⁻¹ K⁻¹ in the armchair direction at 300 K, respectively. The anisotropic thermal conductivities, regardless of the thickness, might result from the anisotropic phonon velocity arising from the hinge-like structure. The surface-driven suppression of the thermal conductivities at a nanometer scale is remarkable for a wide temperature range of 100 to 300 K due to phonon-boundary scattering, while the thermal conductivity becomes less dependent on the thickness at higher temperatures above 300 K, owing to the dominant phonon–phonon scattering.

中文翻译：

黑磷纳米片的厚度依赖性和各向异性导热系数†

在13至48 nm的厚度范围内，通过实验和理论研究了厚度对之字形和扶手椅平面方向上各向异性的黑磷纳米片的热导率的影响。热导率随着厚度的增加而降低，在之字形方向上从13 W m ^-1 K ^-1降低，在10 W ^-1 W ^-1 K ^{-1范围内降低}在扶手椅方向分别为300K。无论厚度如何，各向异性热导率都可能是由铰链状结构引起的各向异性声子速度引起的。由于声子边界散射，在100到300 K的较宽温度范围内，表面驱动的热导率抑制在纳米范围内是显着的，而由于在300 K以上的较高温度下，热导率变得不再取决于厚度到主要的声子-声子散射。

更新日期：2018-02-21

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