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High-quality self-assembled zinc sulphide photonic crystals with a maximum reflectance of up to 98%

wallpapers Tech 2020-06-01
The Shenzhen Institutes of Advanced Technology of the Chinese Academy of Sciences successfully prepared high-quality zinc sulphide photonic crystals, which not only achieved high reflectivity of nearly 100%, but also significantly improved the structural colour performance of saturation, contrast, and brightness.
 
Colloidal photonic crystal refers to an ordered periodic structure composed of monodisperse micron or nanometer-sized colloidal particles. In recent years, colloidal photonic crystals have been widely used in optical displays and biochemical sensors. Although some excellent results have been achieved in basic colour research based on colloidal photonic crystals, the currently used colloidal particle materials have a low refractive index, which leads to many problems in display brightness, contrast, and visibility—significant improvement and promotion. Therefore, the use of high refractive index materials to prepare photonic crystals to achieve a wider photonic bandgap has become the research focus and difficulty of obtaining high-quality colloidal photonic crystals. On the other hand, it has been reported that adding a black light-absorbing material to a photonic crystal can absorb scattered light and significantly enhance the colour of the photonic crystal structure. At present, the standard method of combining black elements into colloidal photonic crystals mainly uses the physical mixing method. However, this method is easy to cause the agglomeration of black materials and uneven distribution within the photonic crystals. Therefore, it is necessary to develop a simple and effective way to uniformly mix black materials into the photonic crystal without affecting the long-range ordered periodic structure arrangement of the photonic crystal.
 
In this work, in response to the above research goals, researchers have successfully prepared uniform zinc sulphide nanoparticles with adjustable sizes of 40-200 nm, and further, disperse the materials by silica coating to protect calcination and partial etching Degree, surface charge and crystallinity are adjusted. At the same time, the organic structure guiding agent added in the material synthesis can generate in-situ carbon-based materials that can effectively absorb scattered light after calcination and are evenly distributed in the colloidal particles. After self-assembly, a long-range ordered structure with significantly enhanced structural colours is obtained. The maximum reflectivity of the obtained self-assembled colloidal photonic crystal can reach 98%, and the particle size can flexibly adjust its reflection spectrum. This work provides new design ideas and methods for obtaining high-quality photonic crystals, effectively improves the quality of colloidal photonic crystals, and facilitates the widespread application of photonic crystal technology.
 
Trunnano is one of the world's largest producers of zinc sulphide nanomaterials, as well as various sulphide nanoproducts. If you want to know about sulphide nanoproducts, please contact Dr Leo, email: brad@ihpa.net.

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