Thermal conductivity reduction in core-shell nanowires
文献类型：期刊论文
| 作者 | Hu, Ming1; Zhang, Xiaoliang1,2; Giapis, Konstantinos P.3; Poulikakos, Dimos1 |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2011-08-29 |
| 卷号 | 84期号:8 |
| 英文摘要 | Nanostructuring of thermoelectric materials bears promise for manipulating physical parameters to improve the energy conversion efficiency of thermoelectrics. Using nonequilibrium molecular dynamics, we investigate how the thermal conductivity can be altered in core-shell nanocomposites of Si and Ge. By calculating the phonon vibrational density of states and performing normal mode analysis, we show that the thermal conductivity decreases when phonon-transport becomes diffusion-dominated and unveil a competition between modes from the various regions of the nanocomposite (core, interface, and shell). The effects of nanowire length, cross section, and temperature on thermal conductivity are explicitly considered. Surprisingly, the thermal conductivity variation with nanowire length is much weaker than in pure nanowires. Also, the thermal conductivity is almost independent of temperature in the wide region between 50 and 600 K, a direct result of confinement of the core by the shell. These results suggest that core-shell nanowires are promising structures for thermoelectrics. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Physics, Condensed Matter |
| 研究领域[WOS] | Physics |
| 关键词[WOS] | SILICON NANOWIRES ; THERMOELECTRIC PERFORMANCE ; MOLECULAR-DYNAMICS ; HETEROSTRUCTURES ; SIMULATION ; GERMANIUM |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000294326200025 |
| 公开日期 | 2015-12-22 |
| 源URL | [http://ir.etp.ac.cn/handle/311046/106530]  |
| 专题 | 工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI） |
| 作者单位 | 1.Swiss Fed Inst Technol, Dept Mech & Proc Engn, Lab Thermodynam Emerging Technol, CH-8092 Zurich, Switzerland 2.Chinese Acad Sci, Inst Engn Thermophys, Ctr Heat & Mass Transfer, Beijing 100190, Peoples R China 3.CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA |
| 推荐引用方式 GB/T 7714 | Hu, Ming,Zhang, Xiaoliang,Giapis, Konstantinos P.,et al. Thermal conductivity reduction in core-shell nanowires[J]. PHYSICAL REVIEW B,2011,84(8). |
| APA | Hu, Ming,Zhang, Xiaoliang,Giapis, Konstantinos P.,&Poulikakos, Dimos.(2011).Thermal conductivity reduction in core-shell nanowires.PHYSICAL REVIEW B,84(8). |
| MLA | Hu, Ming,et al."Thermal conductivity reduction in core-shell nanowires".PHYSICAL REVIEW B 84.8(2011). |
入库方式： OAI收割
来源：工程热物理研究所
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