Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles
Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles
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DOI：
10.1002/adom.202000033
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发表时间：
2020-04-20
影响因子：
9
通讯作者：
Fujii, Minoru
中科院分区：
文献类型：
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作者：
Sugimoto, Hiroshi;Okazaki, Takuma;Fujii, Minoru
直径为100-200 nm的结晶硅（Si）纳米颗粒（NP）由于米氏共振而呈现高度饱和的颜色，并且可以是实现覆盖整个可见光范围的角度不敏感结构色的组分。然而，迄今为止，通过Si纳米结构对基板进行着色仅通过使用电子束光刻和干法蚀刻工艺在非常小的区域中实现。在这项工作中，一个硅纳米粒子彩色油墨能够着色的柔性基板的绘画过程中开发。Si纳米颗粒的球形度非常高，从透射电子显微镜图像获得的圆形因子达到0.97。Si纳米球的平均直径控制在95 ~ 200 nm之间，由标准偏差除以平均直径定义的多分散性小至6%。由于高球形度、高结晶度、高尺寸纯度和在溶液中的完美分散，Si纳米球溶液表现出在蓝色至橙子范围内的肉眼可识别的鲜艳颜色。与聚合物粘合剂组合的Si纳米球彩色油墨能够通过涂漆工艺使柔性基底着色。
A crystalline silicon (Si) nanoparticle (NP) of 100-200 nm in diameter exhibits a highly saturated color owing to Mie resonance, and can be a component to realize angle-insensitive structural color covering the entire visible range. However, to date, coloring a substrate by Si nanostructures has only been achieved in a very small area by using electron beam lithography and dry etching processes. In this work, a Si NP color ink capable of coloring a flexible substrate by a painting process is developed. The sphericity of Si NPs is very high; the circularity factor obtained from a transmission electron microscope image reaches 0.97. The average diameter of Si nanospheres is controlled from 95 to 200 nm, and the polydispersity defined by the standard deviation divided by the average diameter is as small as 6%. Because of the high sphericity, high crystallinity, high size purity, and perfect dispersion in solution, the Si nanosphere solutions exhibit vivid colors recognizable by naked eye in a range of blue to orange. The Si nanosphere color inks combined with a polymer binder are capable of coloring flexible substrates by a painting process.