A research team composed of Yan Wensheng, Sun Zhihu, and Liu Qinghua, associate researchers of the National Synchrotron Radiation Laboratory at the University of Science and Technology of China, under the leadership of professor Wei Shiqiang, uses synchrotron radiation soft X-ray absorption spectroscopy to study the structure of two-dimensional ultra-thin MoS2 semiconductor magnetic materials. Important advances in the control of morphology, performance and performance. The research results were published in the "American Chemical Society". The two-dimensional ultra-thin semiconductor nanosheets have macroscopically ultra-thinness, transparency, flexibility, and microscopically superior electrical, magnetic, and optical properties, and are capable of realizing miniaturization and function maximization of spintronic devices and preparing a large area and High-quality materials such as nano-spintronic devices have great development potential. In many 2D ultra-thin semiconductor nanosheets, MoS2 nanosheets have attracted people's attention due to their excellent electrical properties such as high carrier mobility similar to graphene, adjustable carrier type, and high on/off ratio. Great research interests, but their intrinsic non-ferromagnetic limits their practical application in spintronic devices, so how to give MoS2 two-dimensional ultra-thin semiconductor nanometer room temperature ferromagnetism becomes an important aspect of both academic and applied research. Scientific issues of value. The research group proposed that the Mo atom magnetic moment in MoS2 with a triangular prism coordination environment (2H phase) is zero, and the octahedral coordination (1T phase) MoS2 has a non-zero magnetic moment in the physical facts. The idea of ​​room temperature ferromagnetism can be induced by the introduction of 1T phase MoS2 by "phase doping" in the 2H phase MoS2. Experimentally, they introduced sulfur vacancies in the 2H phase MoS2 nanosheets through the “two-step synthesis methodâ€, which can convert the octahedral coordinated Mo atoms into the coordination of the triangular prism to realize the 1T phase. MoS2 was doped into 2H phase MoS2 nanosheets. Through this phase doping method, the occupancy characteristic of the 3d electron orbit in Mo ions was changed, and the room temperature ferromagnetism of the MoS2 ultrathin nanosheet was realized. The Curie temperature was 395K and the saturation magnetization was 0.25mB/Mo. Soft X-ray absorption spectroscopy and first-principles calculations indicate that the interstitial state introduced by the Mo ions in the 1T phase near the Fermi surface is the fundamental cause of the high Curie temperature of the MoS2 semiconductor nanoflakes. This research has enriched people's understanding of the interdependence between the topography, microstructure, and properties of two-dimensional magnetic materials, and provided a new method for controlling the magnetic properties of two-dimensional thin sheets by introducing magnetic moments through “phase dopingâ€. . Reviewers believe that "finding room-temperature magnetic materials has always been a problem that needs to be solved and facing major challenges. There is no doubt that this research has made significant progress in this direction and has obtained very interesting results." The study was funded by funds from the National Natural Science Foundation of China and the "973" project of the Ministry of Science and Technology. Iso4035 Hex Thin Nut,Company Of Hexagon Thin Nuts,Fasteners Hexagon Thin Nuts,Oem Hexagon Jam Nuts Chuangtuo Jinggong (Jiangsu) Co., LTD , https://www.chtofastener.com