Two-Dimensional Nanosheets of Magnetic Lanthanide Chalcogenides

磁性镧系元素化物的二维纳米片

• 批准号: 2304974
• 负责人: Sarah Stoll
• 金额: $ 45.7万
• 依托单位: Georgetown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2304974&HistoricalAwards=false
• 关键词: Two; Dimensional; Nanosheets; Magnetic; Lanthanide

With the support of the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry, Professor Sarah Stoll of Georgetown University will develop synthetic routes to novel two-dimensional materials with useful magnetic properties. This project focuses on materials with structures that are naturally layered, with strong covalent bonds within the layer and weak interactions between layers, similar to graphite. A deeper fundamental understanding of how structure and nanosheet thickness determine magnetic coupling and orientation will be key for designing new devices that take advantage of both electronic and magnetic properties, i.e. spintronics. This project will provide research training to graduate and undergraduate students. An interactive workshop that focuses on environmental chemistry and ethics issues will be developed and adapted for a local girls high school. The investigation will focus on three classes of lanthanide (Ln) materials that vary systematically in structural anisotropy, inter-layer bonding, magnetic orientation and electronic conductivity. The first family are the tritellurides, LnTe3, which are van der Waals layered XY magnets in which moment is in the plane of the sheets. Slightly less anisotropic are the ditellurides, LnTe2, ionic-layered Ising magnets in which moment is perpendicular to the plane of the sheets. Finally, the third family are the isotropic monochalcogenides such as EuTe; these are Heisenberg, three-dimensional magnetic semiconductors. The synthetic methods developed will be important for expanding the synthetic range of two-dimensional materials. These materials exhibit a wide range of properties whose further study can extend their utility for next-generation devices.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学系高分子、超分子和纳米化学项目的支持下，乔治城大学的 Sarah Stoll 教授将开发具有有用磁性的新型二维材料的合成路线。 该项目重点研究具有自然层状结构的材料，层内具有强共价键，层之间具有弱相互作用，类似于石墨。 对结构和纳米片厚度如何决定磁耦合和方向的更深入的基本了解将是设计利用电子和磁特性的新设备（即自旋电子学）的关键。 该项目将为研究生和本科生提供研究培训。 将为当地女子高中开发和改编一个重点关注环境化学和伦理问题的互动研讨会。 该研究将重点关注三类镧系元素（Ln）材料，它们在结构各向异性、层间键合、磁性取向和电子传导性方面存在系统性差异。 第一类是三碲化物 LnTe3，它们是范德华层状 XY 磁体，其中力矩位于片平面内。 各向异性稍弱的是二碲化物、LnTe2、离子层状伊辛磁体，其中力矩垂直于片平面。 最后，第三类是各向同性单硫属化物，例如 EuTe；这些是海森堡，三维磁性半导体。 所开发的合成方法对于扩大二维材料的合成范围非常重要。 这些材料表现出广泛的特性，进一步研究可以扩展其在下一代设备中的实用性。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。