High temperature performance of coaxial h-BN/CNT wires above 1,000 °C: Thermionic electron emission and thermally activated conductivity
文献类型：期刊论文
| 作者 | Yang Xinhe1; Liu Peng1; Zhou Duanliang1; Gao Feng2; Wang Xinhe3; Lv Shiwei1; Yuan Zi1; Jin Xiang1; Zhao Wei1; Wei Haoming1 |
| 刊名 | Nano Research
 |
| 出版日期 | 2019 |
| 卷号 | 12期号:8页码:1855-1861 |
| 关键词 | high temperature wire carbon nanotube (CNT) h-boron nitride (h-BN) work function bandgap |
| ISSN号 | 1998-0124 |
| 英文摘要 | The development of wires and cables that can tolerate extremely high temperatures will be very important for probing extreme environments, such as in solar exploration, fire disasters, high-temperature materials processing, aeronautics and astronautics. In this paper, a lightweight high-temperature coaxial h-boron nitride (BN)/carbon nanotube (CNT) wire is synthesized by the chemical vapor deposition (CVD) epitaxial growth of h-BN on CNT yarn. The epitaxially grown h-BN acts as both an insulating material and a jacket that protects against oxidation. It has been shown that the thermionic electron emission (1,200 K) and thermally activated conductivity (1,000 K) are two principal mechanisms for insulation failure of h-BN at high temperatures. The thermionic emission of h-BN can provide the work function of h-BN, which ranges from 4.22 to 4.61 eV in the temperature range of 1,306–1,787 K. The change in the resistivity of h-BN with temperature follows the ohmic conduction model of an insulator, and it can provide the “electron activation energy” (the energy from the Fermi level to the conduction band of h-BN), which ranges from 2.79 to 3.08 eV, corresponding to a band gap for h-BN ranging from 5.6 to 6.2 eV. However, since the leakage current is very small, both phenomena have no obvious influence on the signal transmission at the working temperature. This lightweight coaxial h-BN/CNT wire can tolerate 1,200 °C in air and can transmit electrical signals as normal. It is hoped that this lightweight high-temperature wire will open up new possibilities for a wide range of applications in extreme high-temperature conditions. |
| 语种 | 英语 |
| CSCD记录号 | CSCD:6619257 |
| 源URL | [http://ir.yic.ac.cn/handle/133337/34979]  |
| 专题 | 中国科学院烟台海岸带研究所 |
| 作者单位 | 1.清华大学 2.中国科学院烟台海岸带研究所 3.北京航空航天大学 |
| 推荐引用方式 GB/T 7714 | Yang Xinhe,Liu Peng,Zhou Duanliang,et al. High temperature performance of coaxial h-BN/CNT wires above 1,000 °C: Thermionic electron emission and thermally activated conductivity[J]. Nano Research,2019,12(8):1855-1861. |
| APA | Yang Xinhe.,Liu Peng.,Zhou Duanliang.,Gao Feng.,Wang Xinhe.,...&Jiang Kaili.(2019).High temperature performance of coaxial h-BN/CNT wires above 1,000 °C: Thermionic electron emission and thermally activated conductivity.Nano Research,12(8),1855-1861. |
| MLA | Yang Xinhe,et al."High temperature performance of coaxial h-BN/CNT wires above 1,000 °C: Thermionic electron emission and thermally activated conductivity".Nano Research 12.8(2019):1855-1861. |
入库方式： OAI收割
来源：烟台海岸带研究所
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