Low-Temperature Synthesis of Phase-Pure 0D–1D BaTiO3 Nanostructures Using H2Ti3O7 Templates
✍ Scribed by Duk Kyu Lee; In-Sun Cho; SangWook Lee; Dong Hoe Kim; Hyun-Woo Shim; Dong-Wan Kim; Kug Sun Hong
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 647 KB
- Volume
- 2010
- Category
- Article
- ISSN
- 1434-1948
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✦ Synopsis
Abstract
One‐dimensional (1D) barium titanate (BaTiO~3~) nanowires, which were uniformly covered with 0D BaTiO~3~ nanocrystals, were synthesized by using a simple solvothermal reaction of protonated trititanate (H~2~Ti~3~O~7~) nanowires with barium hydroxide octahydrate [Ba(OH)~2~·8H~2~O] at 80 °C in ethanol/water mixed solvent systems. The compositions of the mixed solvents ― the volume ratio of ethanol to deionized water ― was a key controlling parameter in order to determine the phase formation and primary particle size of the 0D BaTiO~3~ nanocrystals. Single‐phase cubic perovskite BaTiO~3~ started to form at 80 °C in a mixed solvent containing more than approximately 60 % by volume of ethanol. Field‐emission scanning electron microscopy (FESEM) and high‐resolution transmission electron microscopy (HRTEM) analysis revealed that the as‐prepared BaTiO~3~ retained its wire‐shaped morphology with nanocrystals on the surface. Furthermore, the synthetic mechanism of the 0D‐1D BaTiO~3~ nanostructures was demonstrated in view of the dielectric tuning of the mixed solvent and the similarities between the crystal structures of BaTiO~3~ and H~2~Ti~3~O~7~.