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Bai W, Hua Y, Nan P, Dai S, Sun L, Huang X, Yang J, Ge B, Xiao C, Xie Y. Interlayer Phonon Coupling from Heavy and Light Sublayers in a Natural Van der Waals Superlattice. J Am Chem Soc 2024; 146:892-900. [PMID: 38151507 DOI: 10.1021/jacs.3c11379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Layered compounds characterized by van der Waals gaps are often associated with relatively weak interlayer particle interactions. However, in specific scenarios, these seemingly feeble forces can exert an impact on interlayer interactions through subtle energy fluctuations, which can give rise to a diverse range of physical and chemical properties, particularly intriguing in the context of thermal transport. In this study, taking a natural superlattice composed of alternately stacked PbS and SnS2 sublayers as a model, we proposed that in a superlattice, there is strong hybridization between acoustic phonons of heavy sublayers and optical phonons of light sublayers. We identified newly generated vibration modes in the superlattice, such as interlayer shear and breathing, which exhibit lower sound velocity and contribute less to heat transport compared to their parent materials, which significantly alters the thermal behaviors of the superlattice compared to its bulk counterparts. Our findings on the behavior of interlayer phonons in superlattices not only can shed light on developing functional materials with enhanced thermal dissipation capabilities but also contribute to the broader field of condensed matter physics, offering insights into various fields, including thermoelectrics and phononic devices, and may pave the way for technological advancements in these areas.
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Affiliation(s)
- Wei Bai
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei, Anhui 230026, P. R. China
- Institute of Energy, Hefei Comprehensive National Science Center Hefei, Anhui 230031, P. R. China
| | - Yang Hua
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei, Anhui 230026, P. R. China
| | - Pengfei Nan
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University Hefei, Anhui 230601, P. R. China
| | - Shengnan Dai
- Materials Genome Institute, Shanghai University, Shanghai 200444, P. R. China
| | - Liang Sun
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei, Anhui 230026, P. R. China
| | - Xinlong Huang
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei, Anhui 230026, P. R. China
| | - Jiong Yang
- Materials Genome Institute, Shanghai University, Shanghai 200444, P. R. China
| | - Binghui Ge
- Information Materials and Intelligent Sensing Laboratory of Anhui Province, Institutes of Physical Science and Information Technology, Anhui University Hefei, Anhui 230601, P. R. China
| | - Chong Xiao
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei, Anhui 230026, P. R. China
- Institute of Energy, Hefei Comprehensive National Science Center Hefei, Anhui 230031, P. R. China
- Dalian National Laboratory for Clean Energy, Chinese Academy of Science Dalian, Liaoning 116023, P. R. China
| | - Yi Xie
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China Hefei, Anhui 230026, P. R. China
- Institute of Energy, Hefei Comprehensive National Science Center Hefei, Anhui 230031, P. R. China
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Abstract
Energy storage and conversion in a clean, efficient, and safe way is the core appeal of a modern sustainable society, which is built on the development of multifunctional materials. Superlattice structures can integrate the advantage of their sublayers while new phenomena may arise from the interface, which play key roles in modern semiconductor technology; however, additional concerns such as stability and yield challenge their large-scale applications in industrial products. In this Perspective we focus our interest on a distinctive category of easily available multilayered inorganic materials that have well-defined subunit structures and can be regarded as bulk superlattice analogues. We illustrate several specific combining forms of subunits in bulk superlattice analogues, including soft/rigid sublayers, electron/phonon transport sublayers, quasi-two-dimensional layers, and intercalated metal layers. We hope to provide insights into material design and broaden the application scope in the field of energy conversion by integrating the versatility of subunits into these bulk superlattice analogues.
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Affiliation(s)
- Wei Bai
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
| | - Chong Xiao
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.,Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui 230031, People's Republic of China.,Dalian National Laboratory for Clean Energy, Chinese Academy of Science, Dalian, Liaoning 116023, People's Republic of China
| | - Yi Xie
- Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China.,Institute of Energy, Hefei Comprehensive National Science Center, Hefei, Anhui 230031, People's Republic of China
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