Carbon Vesicles: A Symmetry-Breaking Strategy for Wide-Band and Solvent-Processable Ultrablack Coating Materials
Carbon Vesicles: A Symmetry-Breaking Strategy for Wide-Band and Solvent-Processable Ultrablack Coating Materials
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碳囊泡：宽带和可溶剂加工的超黑涂层材料的对称破缺策略
DOI：
10.1002/adfm.201909877
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发表时间：
2020-04-01
影响因子：
19
通讯作者：
Zhao, Ning
中科院分区：
文献类型：
--
作者：
Guo, Jing;Li, Dongdong;Zhao, Ning
可溶剂加工的超黑材料在许多场合具有明显的应用便利性，例如在大型复杂表面上的吸收涂层。然而，开发具有高吸光性能和宽吸收带的溶剂可加工超黑材料仍然是一个巨大的挑战。在这篇文章中，碳泡（CV）的溶剂加工的超黑涂料制造。制造过程涉及二氧化硅和间苯二酚甲醛树脂（RF树脂）的模板化共缩合，然后碳化和模板去除。所得结构显示出非常薄的内层、粗糙的外层以及纳米多孔夹层。这种结构引入了随机性，打破了普通碳空心球的球对称性。因此，避免了由于内部颗粒干涉而产生的结构色。此外，由于其较低的碳填充率和纳米级的散射体尺寸，所制备的CV显示出宽带低反射率。最低反射率在360 nm处达到约0.10%，使其成为有史以来报道的最暗的溶剂可加工超黑材料。本文提出的破胶策略为溶剂可加工超黑材料的设计提供了一种有效的方法。
Solvent-processable ultrablack materials have obvious application convenience in many situations, such as absorbing coatings on large and complex surfaces. However, developing solvent-processable ultrablack materials with high light-absorption performance and wide absorption band remains a great challenge. In this article, carbon vesicles (CVs) are fabricated for solvent-processable ultrablack coating. The fabrication process involves a templated co-condensation of silica and resorcinol formaldehyde resin (RF resin), followed by carbonization and template removal. The resultant structure shows a very thin inner layer, a rough outer layer, as well as a nano-porous interlayer. This structure introduces randomness and breaks the spherical symmetry of the common carbon hollow spheres. As a result, structural color due to inner-particle interference is avoided. In addition, the as-fabricated CVs show a wide-band low reflectance because of its low carbon filling ratio and nanoscale scatterer size. The lowest reflectance reaches approximate to 0.10% at 360 nm, making it the darkest solvent-processable ultrablack material ever reported. The symmetry-breaking strategy presented here provides an efficient way for the design of solvent-processable ultrablack materials.