Daytime radiative cooling is an eco-friendly cooling technique that does not consume additional fuel and is a promising technology now being developed using various materials and methods. Existing radiative cooling emitters are typically in the form of multilayered or mixed thin films and photonic structures, which are difficult to apply in industrial fields. Moreover, the complicated processes and materials used increase the cost. Herein, a dual-modal radiative cooling emitter in the form of a cover sheet developed by electrospinning polyacrylonitrile (PAN) with alumina (Al2O3) and silica (SiO2) nanoparticles is reported; it is an easily accessible and highly practical architecture that can be applied and used in daily life. Additionally, this radiative cooling cover sheet exhibits dual selective- and broadband-like optical properties in the IR region depending on the substrate characteristics for efficient cooling. The cooling power is numerically proven to be 89.51 W m−2, and experimentally, a temperature drop of 9.67 °C could be measured on a daily car model.
Bibliographical noteFunding Information:
S.S. and T.Y.L. contributed equally to this work. This research was supported by Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2018M3D1A1058972) and by the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2019R1A2C3006587).
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- cost effective
- cover sheet
- daytime radiative cooling
- dual optical property
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics