Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10155148 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2018 | 31 Pages |
Abstract
We report a highly efficient thermal rectification model based on the near-field thermal radiation between InSb and graphene-coated SiO2, separated by nanoscale vacuum gaps. The results show that the introduction of graphene sheet enhances significantly near-field radiative heat flux and thermal rectification efficiency owing to the strong coupling of surface plasmon-polaritons between InSb and graphene. Specifically, under the same temperature bias, a rectification efficiency exceeding 80% is obtained at vacuum gaps varying from 10â¯nm to 100â¯nm for the graphene-coated SiO2 case, while such an efficiency requires a narrower gap between 10â¯nm to 20â¯nm for the bare SiO2 case. In addition, the introduction of graphene can lower greatly the emitter's temperature TH, e.g., an efficiency of 60% requires THâ¯=â¯550â¯K in the bare SiO2 case, while it requires only the temperature around 400â¯K in the coated SiO2 case. The above results might be helpful in designing a highly efficient thermal diode with a wider vacuum gap and a lower operating temperature.
Related Topics
Physical Sciences and Engineering
Chemistry
Spectroscopy
Authors
Guoding Xu, Jian Sun, Hongmin Mao, Tao Pan,