Polydimethylsiloxane (PDMS) is a prominent material for radiative cooling due to its promising optical properties in the mid-infrared spectral region as well as its fabrication easiness. Even though several works have reported that the mid-infrared emissivity of a PDMS film can be increased by surface modification, there is still room for further enhancement through global optimization. Here, we designed and fabricated the thin PDMS film patterned with two-dimensional gratings to obtain the highest emissivity in the wavelength range from 8 to 13 μm. A surrogate-model-based optimization was performed, and the optimum structure exhibited the averaged emissivity value of 0.99 in the wavelength of 8–13 μm, which is the highest value reported to date among polymer-based radiative coolers. For real-world applications, we also developed the fabrication method that is repeatable and applicable for various surfaces using a flexible master mold.
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31 August 2020
Research Article|
September 01 2020
Ultrahigh emissivity of grating-patterned PDMS film from 8 to 13 μm wavelength regime
Jaeman Song
;
Jaeman Song
1
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
2
Center for Extreme Thermal Physics and Manufacturing, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
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Junyong Seo;
Junyong Seo
1
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
2
Center for Extreme Thermal Physics and Manufacturing, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
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Jihye Han;
Jihye Han
1
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
2
Center for Extreme Thermal Physics and Manufacturing, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
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Jungchul Lee
;
Jungchul Lee
a)
1
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
2
Center for Extreme Thermal Physics and Manufacturing, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
a)Authors to whom correspondence should be addressed: jungchullee@kaist.ac.kr and bongjae.lee@kaist.ac.kr
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Bong Jae Lee
Bong Jae Lee
a)
1
Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
2
Center for Extreme Thermal Physics and Manufacturing, Korea Advanced Institute of Science and Technology
, Daejeon 34141, South Korea
a)Authors to whom correspondence should be addressed: jungchullee@kaist.ac.kr and bongjae.lee@kaist.ac.kr
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a)Authors to whom correspondence should be addressed: jungchullee@kaist.ac.kr and bongjae.lee@kaist.ac.kr
Appl. Phys. Lett. 117, 094101 (2020)
Article history
Received:
June 10 2020
Accepted:
August 20 2020
Citation
Jaeman Song, Junyong Seo, Jihye Han, Jungchul Lee, Bong Jae Lee; Ultrahigh emissivity of grating-patterned PDMS film from 8 to 13 μm wavelength regime. Appl. Phys. Lett. 31 August 2020; 117 (9): 094101. https://doi.org/10.1063/5.0017838
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