Enhanced and engineered d0 ferromagnetism in molecularly-thin zinc oxide nanosheets

Takaaki Taniguchi, Kazuhiro Yamaguchi, Ayako Shigeta, Yuki Matsuda, Shinya Hayami, Tetsuya Shimizu, Takeshi Matsui, Teruo Yamazaki, Asami Funatstu, Yukihiro Makinose, Nobuhiro Matsushita, Michio Koinuma, Yasumichi Matsumoto

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Molecularly-thin nanosheets are ultimate two-dimensional (2D) nanomaterials potentially giving unusual physical and chemical properties due to the strong 2D quantum and surface effects. Here, it is demonstrated that 1.5-nm-thick ZnO nanosheets exhibit greatly enhanced room-temperature ferromagnetism. Saturation magnetization value of the nanosheets with intercalated dodecyl sulfate layers is approximately 100 times that of ZnO mesocrystals. Anion exchange with dodecyl phosphate layers strongly suppresses ferromagnetic ordering as a result of surface defect passivation while maintaining bulk-like n-type semiconducting properties, which reveals significance of interfacial states to engineer functional properties of nanosheet-based hybrid materials. Dense integration of interfacial ferromagnetic centers in the lamellar structure gives enhanced ferromagnetism to ZnO nanosheets. Anion exchange with dodecyl phosphate layers strongly suppresses ferromagnetic ordering as a result of surface defect passivation while maintaining bulk-like n-type semiconducting properties.

Original languageEnglish
Pages (from-to)3140-3145
Number of pages6
JournalAdvanced Functional Materials
Volume23
Issue number25
DOIs
Publication statusPublished - 2013 Jul 5
Externally publishedYes

    Fingerprint

Keywords

  • ferromagnetism
  • hybrid materials
  • layered materials
  • nanosheets
  • ZnO

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Taniguchi, T., Yamaguchi, K., Shigeta, A., Matsuda, Y., Hayami, S., Shimizu, T., Matsui, T., Yamazaki, T., Funatstu, A., Makinose, Y., Matsushita, N., Koinuma, M., & Matsumoto, Y. (2013). Enhanced and engineered d0 ferromagnetism in molecularly-thin zinc oxide nanosheets. Advanced Functional Materials, 23(25), 3140-3145. https://doi.org/10.1002/adfm.201202704