Abstract
Exploring new strategies to broaden the upper/lower limit of thermal conductivity is of great interest to develop thermal management materials that can adapt to extreme environments. In this work, we employ an interfacial ion regulation to enhance the thermal insulation performance of 2D layered double hydroxide nanosheets. The introduction of interfacial ion enlarges the interplanar spacing of Co(OH)2 nanosheets from 4.64 to 8.05 Å, which reduces phonon scattering length perpendicular to the two-dimensional plane and leads to enhanced interlayer thermal insulation. The interfacial ion-regulated Co(OH)2 (named as Co(OH)2-Mx−) exhibits 3-fold enhancement of thermal insulation through decreasing the thermal conductivity to as low as 0.15 W m−1 K−1, which is among the top values in 2D solid materials. We anticipate that interfacial ion regulation for 2D nanosheets paves a new avenue to break through the thermal insulation limit.
摘要
探索热导率的极限对于开发适应极端环境的热管理材料具有重要意义. 在这项工作中, 我们采用界面离子调控来提高二维层状氢氧化物纳米片的隔热性能. 界面离子的引入使Co(OH)2纳米片的层间距从4.64 Å增大到8.05 Å, 从而减小了垂直于二维平面的声子散射长度, 增强了层间的隔热性能. 我们的界面离子调控策略可将Co(OH)2纳米片导热系数降低至0.15 W m-1K-1, 使其隔热性能提高了3倍. 此外界面离子调控策略将为突破二维固体材料的隔热极限开辟一条新的途径.
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Acknowledgements
This work was supported by the National Basic Research Program of China (2017YFA0206702), the National Natural Science Foundation of China (21925110, 21890751, 91745113), the China Postdoctoral Science Foundation (2019TQ0299), the Fundamental Research Funds for the Central Universities (WK 2060190084), the Natural Science Foundation of China (U1832168), the Anhui Provincial Natural Science Foundation (1808085MB26) and the Fundamental Research Funds for the Central Universities (WK5290000001) and the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB36000000) and China National Postdoctoral Program for Innovative Talents (BX2021283). The authors thank Dr. Jie Tian and Dr. Huijuan Wang at Engineering and Materials Science Experiment Centre for the help of HRTEM experiments. The authors also appreciate the support from the Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology. This work was partially carried out at the USTC Center for Micro and Nanoscale Research and Fabrication.
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Wang, C., Xu, H., Cheng, H. et al. Interfacial ion regulation on 2D layered double hydroxide nanosheets for enhanced thermal insulation. Sci. China Chem. 65, 898–904 (2022). https://doi.org/10.1007/s11426-021-1201-0
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DOI: https://doi.org/10.1007/s11426-021-1201-0