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

研究成果: Article査読

30 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)3140-3145
ページ数6
ジャーナルAdvanced Functional Materials
23
25
DOI
出版ステータスPublished - 2013 7 5
外部発表はい

ASJC Scopus subject areas

  • 生体材料
  • 電気化学
  • 凝縮系物理学
  • 電子材料、光学材料、および磁性材料

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