Technique for Creating 3D Ordered Colloidal Crystals with Hexagonal Close Packing and Uniform Thickness over a Large Area.

IF 2.8 2区 化学 Q3 CHEMISTRY, PHYSICAL The Journal of Physical Chemistry B Pub Date : 2025-01-16 Epub Date: 2024-12-05 DOI:10.1021/acs.jpcb.4c06234
Alina Fumina, Anastasiya Speshilova, Ilya Belyanov, Ekaterina Endiiarova, Artem Osipov
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Abstract

Traditional approaches to creating colloidal crystals do not simultaneously achieve uniform thickness, three-dimensional ordering, and large areas of defect-free hexagonal close-packed domains. Only the realization of all these conditions will allow the use of colloidal crystals as templates for fabricating inverse opals with a tunable photonic band gap. Therefore, we propose a novel approach for creating 3D colloidal crystals. It combines the use of the Langmuir-Blodgett (LB) process to form the first layer and sequential spin-coating processes to form all following layers. The original automated LB trough, equipped with a feedback control system for surface pressure control, allowed the formation of a close-packed monolayer across the entire area of a 76 mm substrate, obtaining a defect-free domain area of 3000 μm2. As a result of the developed spin-coating technique, bilayer and three-layer colloidal crystals based on polystyrene spheres (1.25 and 1.8 μm) were obtained. Three-dimensional HCP structure covered ≈96.5% of the substrate, and a defect-free domain area was obtained at least 1000 μm2. The high degree of 3D ordering was confirmed by the presence of stop bands in the transmission spectra at wavelengths corresponding to Bragg diffraction from parallel planes and a 2D array of spherical particles.

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三维有序胶体晶体的六边形紧密堆积和大面积均匀厚度生成技术。
传统的制造胶体晶体的方法不能同时实现均匀的厚度、三维有序和大面积无缺陷的六边形紧密堆积域。只有实现所有这些条件,才允许使用胶体晶体作为模板来制造具有可调谐光子带隙的反蛋白石。因此,我们提出了一种创造三维胶体晶体的新方法。它结合了Langmuir-Blodgett (LB)工艺形成第一层和连续旋转涂层工艺形成所有后续层的使用。原始的自动化LB槽配备了用于表面压力控制的反馈控制系统,可以在76 mm基板的整个区域上形成紧密堆积的单层,获得3000 μm2的无缺陷畴面积。利用旋涂技术,制备了基于聚苯乙烯球(1.25 μm和1.8 μm)的双层和三层胶体晶体。三维HCP结构覆盖了约96.5%的衬底,获得了至少1000 μm2的无缺陷畴面积。在平行平面和二维球形粒子阵列的Bragg衍射波长对应的透射光谱中存在停止带,证实了高度的三维有序。
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来源期刊
CiteScore
5.80
自引率
9.10%
发文量
965
审稿时长
1.6 months
期刊介绍: An essential criterion for acceptance of research articles in the journal is that they provide new physical insight. Please refer to the New Physical Insights virtual issue on what constitutes new physical insight. Manuscripts that are essentially reporting data or applications of data are, in general, not suitable for publication in JPC B.
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