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

doi:10.1002/adfm.201202704

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

35 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 language	English
Pages (from-to)	3140-3145
Number of pages	6
Journal	Advanced Functional Materials
Volume	23
Issue number	25
DOIs	https://doi.org/10.1002/adfm.201202704
Publication status	Published - 2013 Jul 5
Externally published	Yes

Keywords

ferromagnetism
hybrid materials
layered materials
nanosheets
ZnO

ASJC Scopus subject areas

Biomaterials
Electrochemistry
Condensed Matter Physics
Electronic, Optical and Magnetic Materials

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10.1002/adfm.201202704

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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.",

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AU - Yamaguchi, Kazuhiro

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AU - Hayami, Shinya

AU - Shimizu, Tetsuya

AU - Matsui, Takeshi

AU - Yamazaki, Teruo

AU - Funatstu, Asami

AU - Makinose, Yukihiro

AU - Matsushita, Nobuhiro

AU - Koinuma, Michio

AU - Matsumoto, Yasumichi

PY - 2013/7/5

Y1 - 2013/7/5

N2 - 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.

AB - 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.

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

Abstract

Keywords

ASJC Scopus subject areas

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