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Heat Conductor–Insulator Transition in Electrochemically Controlled Hybrid Superlattices
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.nanolett.2c01407 Jiawei Zhou 1 , Yecun Wu 1 , Heungdong Kwon , Yanbin Li 1 , Xin Xiao , Yusheng Ye 1 , Yinxing Ma , Kenneth E Goodson , Harold Y Hwang 1 , Yi Cui 1
Nano Letters ( IF 9.6 ) Pub Date : 2022-06-17 , DOI: 10.1021/acs.nanolett.2c01407 Jiawei Zhou 1 , Yecun Wu 1 , Heungdong Kwon , Yanbin Li 1 , Xin Xiao , Yusheng Ye 1 , Yinxing Ma , Kenneth E Goodson , Harold Y Hwang 1 , Yi Cui 1
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Designing materials with ultralow thermal conductivity has broad technological impact, from thermal protection to energy harvesting. Low thermal conductivity is commonly observed in anharmonic and strongly disordered materials, yet a microscopic understanding of the correlation to atomic motion is often lacking. Here we report that molecular insertion into an existing two-dimensional layered lattice structure creates a hybrid superlattice with extremely low thermal conductivity. Vibrational characterization and ab initio molecular dynamics simulations reveal strong damping of transverse acoustic waves and significant softening of longitudinal vibrations. Together with spectral correlation analysis, we demonstrate that the molecular insertion creates liquid-like atomic motion in the existing lattice framework, causing a large suppression of heat conduction. The hybrid materials can be transformed into solution-processable coatings and used for thermal protection in wearable electronics. Our work provides a generic mechanism for the design of heat insulators and may further facilitate the engineering of heat conduction based on understanding atomic correlations.
中文翻译：
电化学控制的混合超晶格中的热导体-绝缘体转变
设计具有超低导热率的材料具有广泛的技术影响，从热保护到能量收集。在非谐和强烈无序的材料中通常观察到低热导率，但通常缺乏对与原子运动相关性的微观理解。在这里，我们报告分子插入现有的二维层状晶格结构会产生具有极低热导率的混合超晶格。振动表征和从头算分子动力学模拟揭示了横向声波的强阻尼和纵向振动的显着软化。结合光谱相关性分析，我们证明分子插入在现有晶格框架中产生了类似液体的原子运动，从而导致热传导受到很大抑制。混合材料可以转化为可溶液加工的涂层，并用于可穿戴电子设备的热保护。我们的工作为绝热体的设计提供了一种通用机制，并且可以在了解原子相关性的基础上进一步促进热传导工程。
更新日期：2022-06-17
中文翻译：
电化学控制的混合超晶格中的热导体-绝缘体转变
设计具有超低导热率的材料具有广泛的技术影响，从热保护到能量收集。在非谐和强烈无序的材料中通常观察到低热导率，但通常缺乏对与原子运动相关性的微观理解。在这里，我们报告分子插入现有的二维层状晶格结构会产生具有极低热导率的混合超晶格。振动表征和从头算分子动力学模拟揭示了横向声波的强阻尼和纵向振动的显着软化。结合光谱相关性分析，我们证明分子插入在现有晶格框架中产生了类似液体的原子运动，从而导致热传导受到很大抑制。混合材料可以转化为可溶液加工的涂层，并用于可穿戴电子设备的热保护。我们的工作为绝热体的设计提供了一种通用机制，并且可以在了解原子相关性的基础上进一步促进热传导工程。
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