High-temperature dielectric responses of molecularly-thin titania nanosheet

Yoon Hyun Kim, Minoru Osada, Lei Dong, Hyung Jun Kim, Takayoshi Sasaki

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We have investigated high-temperature dielectric properties of titania nanosheet (Ti<inf>0.87</inf>O<inf>2</inf>), a new class of high-κ nanomaterials derived from the exfoliation of layered compounds. In-situ characterizations using atomic force microscopy indicate a robust insulating property in a monolayer form of Ti<inf>0.87</inf>O<inf>2</inf> nanosheets even at 200°C. Furthermore, layer-by-layer assembled nanocapacitors exhibit both size-free high-ε<inf>r</inf> characteristic (∼120) and high insulation resistance (∼10<sup>-7</sup> A/cm<sup>2</sup>) at high temperatures up to 250°C. The simultaneous improvement of ε<inf>r</inf> and thermal stability in high-κ nanodielectrics is of critical importance for applications of high-temperature capacitors.

Original languageEnglish
Pages (from-to)335-339
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Issue number1437
Publication statusPublished - 2015


  • In-situ characterization
  • Nanodielectric
  • Thermal stability
  • Titania nanosheet

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry
  • Chemistry(all)
  • Condensed Matter Physics

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