Huan Yang, Fang Wang*, Huisheng Zhang, Lihong Guo, Liyan Hu, Lanfang Wang, Ding-Jiang Xue*, Xiaohong Xu*
Solution Synthesis of Layered van der Waals (vdW) Ferromagnetic CrGeTe3 Nanosheets from a Non-vdW Cr2Te3 Template
( J. Am. Chem. Soc. 2020, 142, 9, 4438-4444. https://doi.org/10.1021/jacs.9b13492)
许小红教授团队发表JACS封面文章：基于非范德华Cr2Te3模板液相合成二维范德华铁磁CrGeTe3纳米片
Abstract
CrGeTe3 has recently emerged as a new class of two-dimensional (2D) materials due to its intrinsic long-range ferromagnetic order. However, almost all the reported synthesis methods for CrGeTe3 nanosheets are based on the conventional mechanical exfoliation from single-crystalline CrGeTe3, which is prepared by the complicated self-flux technique. Here we report a solution-processed synthesis of CrGeTe3 nanosheets from a non-van der Waals (vdW) Cr2Te3 template. This structure evolution from non-vdW to vdW is originated from the substitution of Ge atoms on the Cr sites surrounded by fewer Te atoms in the Cr2Te3 lattice due to their smaller steric hindrance and lower energy barrier. These CrGeTe3 nanosheets present regular hexagonal structures with a diameter larger than 1 μm and excellent stability. They exhibit soft magnetic behavior with a Curie temperature lower than 67.5 K. This non-vdW to vdW synthesis strategy promotes the development of CrGeTe3 in ferromagnetism while providing an
effective route to synthesize other 2D materials.
网址链接：https://pubs.acs.org/doi/10.1021/jacs.9b13492
