期刊
ADVANCED FUNCTIONAL MATERIALS
卷 23, 期 25, 页码 3140-3145出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201202704
关键词
ferromagnetism; ZnO; nanosheets; hybrid materials; layered materials
类别
资金
- Core Research of Evolutional Science & Technology (CREST) of the Japan Science and Technology Agency [23710131, 23245036]
- Grants-in-Aid for Scientific Research [23710131, 23245036, 24108733] Funding Source: KAKEN
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.
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