Abstract: In recent years, with the worsening of energy and environmental problems, the radiative cooling technology which can cool the object without energy consumption has attracted worldwide attention. This cooling technology uses the extract temperature difference between the earth and the universe to transfer heat directly to outer space in the form of radiation without energy input, which is able to avoid many energy and environmental problems caused by waste heat. Early researches brushed the paint with radiative cooling ability on the object surface, which can only achieve cooling effect at night. In order to achieve radiative cooling during daytime, it is generally necessary to introduce materials with specific structures, such as multilayer film structure, two-dimensional photonic structure, meta-structure, etc. However, the as-prepared material has disadvantages such as high cost, low yield, small area which seriously hinder the practical application of radiative cooling materials . With the development of radiative cooling theory and the maturation of advanced manufacture techniques, the preparation methods of radiative cooling materials are becoming more and more diversified. Vacuum evaporation, micro-nano processing technology, direct coating, extrusion molding and electrospinning have been reported. Large area radiative cooling materials can be prepared at low cost, which further promotes the commercial application of radiative cooling technology. This review summarizesresearch status of radiative cooling materials preparation, compares the advantages and disadvantages of different preparation methods. First, the common radiative cooling materials and forming methods are summarized; then the widely used preparation methods of radiative cooling materials are introduced and their characteristics are analyzed. After that the fabrication methods chosen by the researchers for specific materials or application scenarios are summarized. Finally current problems and future development perspectives of the preparation of radiative cooling materials are discussed.
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2022, Vol. 36 
