|
|||||
|
|
Enhanced and Engineered d0 Ferromagnetism in Molecularly‐Thin Zinc Oxide Nanosheets |
|
| Authors: | 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 |
| Affiliation: | 1. Graduate School of Science and Technology, Kumamoto University, 2‐39‐1 Kurokami, Chuo‐ku, Kumamoto, 860‐8555, Japan;2. JST, CREST, 5 Sanbancho, Chiyoda‐ku, Tokyo, 102‐0075, Japan;3. Department of Physics, Faculty of Science and Technology, Tokyo University of Science, 2461 Yamazaki, Noda, Chiba 278‐8510, Japan;4. Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori‐ku, Yokohama 226‐8503, Japan |
| 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. |
| Keywords: | ferromagnetism ZnO nanosheets hybrid materials layered materials |