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| Semiconductive and Ferromagnetic Lanthanide MXenes Derived from Carbon Intercalated Two-dimensional Halides | |
| 2024-10-24 | |
| 状态 | 已发表 |
| 摘要 | Two-dimensional (2D) magnetic semiconductors are a key focus in developing next-generation information storage technologies1,2. MXenes, as emerging 2D early transition metal carbides and nitrides, offer versatile compositions and tunable chemical structures3. Incorporating lanthanide metals, with their unique role of 4f-electrons in engineering physical properties4, into MXenes holds potential for advancing technological applications. However, the scarcity of lanthanide-containing ternary MAX phase precursors and the propensity of lanthanides to oxidize pose significant challenges to obtain lanthanide MXenes (Ln2CT2) via the ‘top-down’ etching method5. Here, we propose a general ‘bottom-up’ methodology for lanthanide MXenes, that derive from carbon intercalated van der Waals building blocks of 2D halides. Compared to conventional MXenes conductors, the synthesized Ln2CT2 exhibit tunable band gaps spanning 0.32 eV to 1.22 eV that cover typical semiconductors such as Si (1.12 eV) and Ge (0.67 eV). Additionally, the presence of unpaired f- electrons endows Ln2CT2 with intrinsic ferromagnetism, with Curie temperatures ranging between 36 K and 60 K. Theoretical calculations reveal that, in contrast to traditional MXenes, the number of d- electrons states around the Fermi level are largely diminishes in bare Ln2C MXenes, and the halogen terminals can further exhaust these electrons to open band gaps. Meanwhile, the Ln-4f electrons in Ln2CT2 are highly localized and stay away from the Fermi level, contributing to the spin splitting for the observed ferromagnetic behavior. Lanthanide MXenes hold immense promise for revolutionizing future applications in spintronic devices. |
| 语种 | 英语 |
| DOI | arXiv:2410.18337 |
| 相关网址 | 查看原文 |
| 出处 | Arxiv |
| 收录类别 | PPRN.PPRN |
| WOS记录号 | PPRN:118801507 |
| WOS类目 | Chemistry, Physical ; Computer Science, Interdisciplinary Applications ; Physics, Condensed Matter |
| 资助项目 | National Natural Science Foundation of China["U23A2093","12435017"] |
| 文献类型 | 预印本 |
| 条目标识符 | https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/471035 |
| 专题 | 物质科学与技术学院 物质科学与技术学院_博士生 物质科学与技术学院_PI研究组_曹克诚组 |
| 通讯作者 | Yang, Hongxin; Huang, Qing |
| 作者单位 | 1.Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhejiang Key Lab Data Driven High Safety Energy Mat & Applicat, Ningbo Key Lab Special Energy Mat & Chem, Ningbo 315201, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Qianwan Inst CNiTECH, Ningbo 315336, Peoples R China 4.Zhejiang Univ, Ctr Quantum Matter, Sch Phys, Hangzhou 31008, Peoples R China 5.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 6.ShanghaiTech Univ, Shanghai Key Lab High resolut Electron Microscopy, Shanghai 201210, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fang, Qian,Wang, Liming,Chang, Kai,et al. Semiconductive and Ferromagnetic Lanthanide MXenes Derived from Carbon Intercalated Two-dimensional Halides. 2024. |
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