Enhanced dielectric response induced by controlled morphology in rutile TiO₂ nanocrystals

• OSADA Minoru

  International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS)

• KOBAYASHI Makoto

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• KAKIHANA Masato

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

Abstract

High-quality rutile TiO₂ nanocrystals have been synthesized by a simple hydrothermal treatment of a watersoluble titanium–glycolate complex at 200°C. The obtained samples were composed of rod- or whisker-like nanocrystals. The aspect ratios of these nanocrystals could be controlled by adding glycolic acid. Combined characterizations with X-ray diffraction, Raman scattering and high-resolution transmission electron microscopy revealed the formation of highly phase-pure and well-crystallized rutile nanorods/nanowhiskers with the c-axis orientation. Room-temperature dielectric measurements indicated that the permittivity for the rutile nanowhiskers is ~150 at 100 kHz, which is higher than that for the bulk rutile powder. These observations pave a way for morphological controlled rutile nanocrytals to find a broad class of technological uses.

Journal

• Journal of the Ceramic Society of Japan

  Journal of the Ceramic Society of Japan 121 (1416), 593-597, 2013

  The Ceramic Society of Japan

Keywords

• Rutile-type titanium oxide
• Watersoluble titanium complex
• Hydrothermal treatment
• Nanocrystal
• Dielectric material

Details

• CRID: 1390282680263503488
• NII Article ID: 130004480186
• DOI: 10.2109/jcersj2.121.593
• ISSN: 13486535
• ISSN: 18820743
• Web Site: https://www.jstage.jst.go.jp/article/jcersj2/121/1416/121_JCSJ-P13056/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed