摘要
Although ultrablack surfaces are urgently needed in wide applications owing to their extremely low reflectance over a broadband wavelength,obtaining simultaneously the ultrablackness and mechanical robustness by simple process technique is still a great challenge.Herein,by decoupling different light extinction effects to different layers of coating,we design an ultrablack coating that is all-sprayable in whole process.This coating presents low reflectance over visible–mid-infrared(VIS–MIR)wavelength(av.R≈1%in VIS),low multi-angle scattering(bidirectional reflection distribution function(BRDF)=10-2–10-3 sr-1),together with good substrate adhesion grade and self-cleaning ability,which are superior to most reported sprayable ultrablack surfaces.The light extinction effects of each layer are discussed.This method is also applicable in other material systems.
基金
supported by the National Natural Science Foundation of China(Nos.11832010,11890682 and 21721002)
the National Key Basic Research Program of China(No.2018YFA0208403)
the Austrian-Chinese Cooperative Research and Development Projects(No.GJHZ2043),Chinese Academy of Sciences.
作者简介
Address correspondence to Hui Zhang,zhangh@nanoctr.cn;Zhong Zhang,zhongzhang@ustc.edu.cn。
