Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles,Advanced Optical Materials

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Mie Resonator Color Inks of Monodispersed and Perfectly Spherical Crystalline Silicon Nanoparticles
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-04-20 , DOI: 10.1002/adom.202000033
Hiroshi Sugimoto _{1,

2} , Takuma Okazaki ₁ , Minoru Fujii ₁

Affiliation

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.

中文翻译：

单分散和完美球形结晶硅纳米粒子的Mie谐振器彩色油墨

直径为100-200 nm的结晶硅（Si）纳米颗粒（NP）由于Mie共振而显示出高度饱和的颜色，并且可以是实现覆盖整个可见范围的对角度不敏感的结构色的组件。然而，迄今为止，通过使用电子束光刻和干法蚀刻工艺，仅在非常小的区域内实现了通过Si纳米结构对基板进行着色。在这项工作中，开发了一种能够通过喷涂工艺使柔性基板着色的Si NP彩色墨水。Si NP的球形度很高；从透射电子显微镜图像获得的圆形度因子达到0.97。Si纳米球的平均直径控制在95至200nm之间，由标准偏差除以平均直径所定义的多分散度小至6％。由于球形度高，Si纳米球溶液具有高结晶度，高尺寸纯度和完美的溶液分散性，可通过肉眼识别出鲜艳的颜色，范围从蓝色到橙色。与聚合物粘合剂结合的Si纳米球彩色油墨能够通过喷涂工艺为柔性基板着色。

更新日期：2020-06-19

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