Zhang Jian, Zhang Haochun, Sun Wenbo, Wang Qi, Zhang Dong
Harbin Institute of Technology, School of Energy and Engineering, Harbin 150001, China.
Materials (Basel). 2022 Jan 26;15(3):935. doi: 10.3390/ma15030935.
Nanoscale thermal shielding is becoming increasingly important with the miniaturization of microelectronic devices. They have important uses in the field of thermal design to isolate electronic components. Several nanoscale thermal cloaks based on graphene and crystalline silicon films have been designed and experimentally verified. No study has been found that simultaneously treats the functional region of thermal cloak by amorphization and perforation methods. Therefore, in this paper, we construct a thermal cloak by the above methods, and the ratio of thermal cloaking and response temperature is used to explore its cloaking performance under constant and dynamic temperature boundary. We find that compared with the dynamic boundary, the cloaking effect produced under the constant boundary is more obvious. Under two temperature boundaries, the thermal cloak composed of amorphous and perforated has a better performance and has the least disturbance to the background temperature field. The phonon localization effect produced by the amorphous structure is more obvious than that of the perforated structure. The phonon localization of the functional region is the main reason for the cloaking phenomenon, and the stronger the phonon localization, the lower the thermal conductivity and the more obvious the cloaking effect. Our study extends the nanoscale thermal cloak construction method and facilitates the development of other nanoscale thermal functional devices.
随着微电子器件的小型化，纳米级热屏蔽变得越来越重要。它们在热设计领域有着重要用途，用于隔离电子元件。基于石墨烯和晶体硅薄膜的几种纳米级热斗篷已被设计并通过实验验证。尚未发现有研究同时采用非晶化和穿孔方法处理热斗篷的功能区域。因此，在本文中，我们通过上述方法构建了一种热斗篷，并利用热隐身与响应温度的比值来探究其在恒定和动态温度边界下的隐身性能。我们发现，与动态边界相比，恒定边界下产生的隐身效果更明显。在两种温度边界下，由非晶化和穿孔组成的热斗篷性能更好，对背景温度场的干扰最小。非晶结构产生的声子局域化效应比穿孔结构更明显。功能区域的声子局域化是隐身现象的主要原因，声子局域化越强，热导率越低，隐身效果越明显。我们的研究扩展了纳米级热斗篷的构建方法，促进了其他纳米级热功能器件的发展。
