Synthesis of polycrystalline Ta₂O₅ inverse opal photonic crystal powders and their optical characterization

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2024-09-30 DOI:10.1016/j.oceram.2024.100688

Taiki Maekawa , Hiroyuki Maekawa , Yuto Ikeda , Tomoya Onoe , Geoffrey I.N. Waterhouse , Kei-ichiro Murai , Toshihiro Moriga

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Abstract

Polycrystalline Ta₂O₅ inverse opal (IO) photonic crystal powders were synthesized using PMMA colloidal crystals as sacrificial templates. We prepared Ta₂O₅ IO powders with vibrant structural colors at UV–vis wavelengths. The photonic bandgaps (PBGs) in the Ta₂O₅ IO powders red-shifted as a function of both the macropore diameter and the refractive index of the medium filling the macropores. Owing to their polycrystalline structure, the Ta₂O₅ IO powders exposed PBGs for various FCC facets, making investigation of their optical properties significantly more complex than Ta₂O₅ IO thin films that preferentially expose only (111) planes as studied previously. Due to the overlap of the PBGs from different FCC facets and the defects that cause light scattering, much of the typical angle-dependent structural color observed in IO thin films was lost in the Ta₂O₅ IO powders. This study offers new insights into the optical properties of IO powders.

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多晶 Ta₂O₅ 逆乳白光子晶体粉末的合成及其光学表征

以 PMMA 胶体晶体为牺牲模板合成了多晶 Ta2O5 反蛋白石（IO）光子晶体粉末。我们制备的 Ta2O5 IO 粉末在紫外可见光波长下具有鲜艳的结构颜色。Ta2O5 IO 粉末中的光子带隙 (PBG) 随大孔直径和填充大孔的介质折射率的变化而发生红移。由于其多晶结构，Ta2O5 IO 粉末暴露出各种 FCC 面的 PBG，这使得对其光学特性的研究要比之前研究的只优先暴露出 (111) 面的 Ta2O5 IO 薄膜复杂得多。由于不同 FCC 面的 PBG 重叠以及导致光散射的缺陷，在 IO 薄膜中观察到的典型的随角度变化的结构颜色在 Ta2O5 IO 粉末中大部分都消失了。这项研究为了解 IO 粉末的光学特性提供了新的视角。

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来源期刊

Open Ceramics Materials Science-Materials Chemistry

CiteScore

4.20

自引率

0.00%

发文量

102

审稿时长

67 days