Tunable solid-state thermal rectification by asymmetric nonlinear radiation
| Autor: | Seunghyun Baik, Dongwoo Lee, Shraddha Ganorkar, Agha Aamir Jan, Jungwan Cho, Junbyeong Lee |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Process Chemistry and Technology Niobium chemistry.chemical_element 02 engineering and technology Radiation 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Thermal conductivity Rectification chemistry Mechanics of Materials Sputtering Thermal Emissivity Optoelectronics General Materials Science Electrical and Electronic Engineering 0210 nano-technology business Common emitter |
| Zdroj: | Materials horizons. 8(7) |
| ISSN: | 2051-6355 |
| Popis: | Thermal rectification is a direction-dependent asymmetric heat transport phenomenon. Here we report the tunable solid-state thermal rectification by asymmetric nonlinear far-field radiation. The asymmetry in thermal conductivity and emissivity of a three-terminal device is realized by sputtering a thin metal film (radiation barrier: niobium, copper, or silver) on the top right half of a polyethylene terephthalate strip (emitter). Both the experiment and finite element analysis are in excellent agreement, revealing a thermal rectification ratio (TR) of 13.0% for the niobium-deposited specimen. The simulation demonstrates that the TR can be further increased to 74.5% by tuning asymmetry in thermal conductivity, emissivity, and surface area. The rectification can also be actively controlled, by gating the environmental temperature, resulting in a maximum TR of 93.1%. This work is applicable for a wide range of temperatures and device sizes, which may find applications in on-demand heat control and thermal logic gates. |
| Databáze: | OpenAIRE |
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