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Fabrication of Barium Strontium Titanate Inverse Opals by the Sol–Gel Process |
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| Authors: | Bo Li Jinqing Wang Ming Fu Ji Zhou Mokoto Kuwabara |
| Affiliation: | Department of Applied Science for Electronics and Materials, Kyushu University, Fukuoka 816-850, Japan; Advanced Materials Institute, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
| Abstract: | Barium strontium titanate (BST) inverse opal photonic crystals (PCs) were fabricated by a process of self-assembly of a polystyrene opal template in combination with infiltration of BST nanoparticles into the voids of a template. In this process, stable monodispersed BST nanoparticles were prepared by dispersing a BST gel into a mixed solvent of 2-methoxyethanol and acetylacetone. Scanning electron microscopy images show that the inverse opals possess a face-centered cubic lattice with a center-to-center distance of the air spheres of 270 nm. The X-ray diffraction result reveals that a ferroelectric perovskite phase was obtained. A photonic bandgap in the visible range is observed from reflection spectra analysis and compared with the theoretical results. |
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