仿生型辐射制冷膜的可见 -近红外双波段光谱辐射特性调控

Radiative cooling is a cooling technology that does not require additional energy consumption and has broad potentials in application. However, most of the existing radiative cooling technologies do not consider the visible light transmission factor, and they cannot be adopted for building lighting, photovoltaic cells and other scenes. Therefore, inspired by the radiative regulation principle of beetle keratin, a method to realize spectral radiation regulation using the refractive index difference of multilayer films was proposed, and low-cost ITO, SiO₂, and PDMS materials were selected as substrate materials to construct a high-efficiency and low-cost biomimetic radiative cooling film technology with visible-near infrared radiation regulation function, and the radiative properties of the film were studied and optimized by using the finite-difference time-domain method. The results indicate that the visible light transmissivity of multilayer films is 11% higher than that of the single layer. For the optimized radiative cooling film, the effective transmissivity of visible light is 87. 6%, the transmissivity of near infrared light is only 9. 0%, and the effective emissivity of “atmospheric window” is 95. 3%.