在近似一维范德瓦尔斯晶TiS3纳米带中对声子传输产生意想不到的兴奋剂效应
Chenhan Liu1,2, Chao Wu1, Xian Yi Tan3,4
1Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, 211100, P. R. China.
Nature communications
|September 12, 2023
概括
氧气兴奋剂出乎意料地提高了准-1D TiS3纳米带的导热性. 更薄的纳米丝带显示出更大的增强,由于增加了氧气替代,改善了声子传输.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术纳米技术
背景情况:
- 兴奋剂通常通过增加音频杂质散射来降低导热率.
- 了解低维材料中的兴奋剂效应对于热管理至关重要.
研究的目的:
- 调查1D范德瓦尔斯 (vdW) TiS3纳米带中对格子导热性的非常规兴奋作用.
- 阐明了观察到的热导电性变化背后的机制,其中包括不同纳米带厚度和氧气兴奋剂.
主要方法:
- 具有不同厚度的TiS3纳米带的实验性表征.
- 氧气兴奋剂和在室温下测量热导率.
- 原子建模以了解兴奋剂诱导的结构和振动变化.
主要成果:
- 在较薄的TiS3纳米丝带 (~19 nm) 中观察到热导率增长7.4倍,氧气注增加.
- 氧原子在较薄的纳米带中优先替代硫,导致晶格收缩和沿链方向增强原子间合.
- 抑制声杂质散射和加强合显著改善了声热传输.
结论:
- 氧化可以增强,而不是降低,在TiS3纳米带等准-1D vdW材料的晶格导热性.
- 1D纳米结构中独特的兴奋机制与3D材料有很大不同,为热性质工程提供了新的途径.
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