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Enhanced and Engineered d 0 Ferromagnetism in Molecularly‐Thin Zinc Oxide Nanosheets
Author(s) -
Taniguchi Takaaki,
Yamaguchi Kazuhiro,
Shigeta Ayako,
Matsuda Yuki,
Hayami Shinya,
Shimizu Tetsuya,
Matsui Takeshi,
Yamazaki Teruo,
Funatstu Asami,
Makinose Yukihiro,
Matsushita Nobuhiro,
Koinuma Michio,
Matsumoto Yasumichi
Publication year - 2013
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201202704
Subject(s) - materials science , nanosheet , ferromagnetism , passivation , nanomaterials , oxide , chemical engineering , zinc , nanotechnology , layer (electronics) , condensed matter physics , metallurgy , physics , engineering
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.